GET https://kbin.spritesserver.nl/index.php/u/@blarbasaurus@lemmy.world/top/2023-06-19::2023-06-19

Response
200 OK
IP
216.73.216.90
Profiled on
Token
a704a0

Security

Token

There is no security token.

Firewall

main Name
Security enabled
Stateless

Configuration

Key Value
provider security.user.provider.concrete.app_user_provider
context main
entry_point App\Security\KbinAuthenticator
user_checker App\Security\UserChecker
access_denied_handler (none)
access_denied_url (none)
authenticators 
[
  "two_factor"
  "remember_me"
  "App\Security\KbinAuthenticator"
  "App\Security\FacebookAuthenticator"
  "App\Security\GoogleAuthenticator"
  "App\Security\GithubAuthenticator"
  "App\Security\KeycloakAuthenticator"
]

Listeners

Listener Duration Response 
Symfony\Component\Security\Http\Firewall\ChannelListener {#723
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
  -logger: Monolog\Logger {#783 …}
  -httpPort: 80
  -httpsPort: 443
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\ContextListener {#706
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage {#1017 …}
  -sessionKey: "_security_main"
  -logger: Monolog\Logger {#783 …}
  -userProviders: Symfony\Component\DependencyInjection\Argument\RewindableGenerator {#705 …}
  -dispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
  -registered: false
  -trustResolver: Scheb\TwoFactorBundle\Security\Authentication\AuthenticationTrustResolver {#780 …}
  -sessionTrackerEnabler: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage::enableUsageTracking(): void {#703 …}
}
 9.25 ms (none) 
Symfony\Component\Security\Http\Firewall\AuthenticatorManagerListener {#584
  -authenticatorManager: Symfony\Component\Security\Http\Authentication\AuthenticatorManager {#595 …}
}
 0.00 ms (none) 
Scheb\TwoFactorBundle\Security\Http\Firewall\TwoFactorAccessListener {#582
  -twoFactorFirewallConfig: Scheb\TwoFactorBundle\Security\TwoFactor\TwoFactorFirewallConfig {#842 …}
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -twoFactorAccessDecider: Scheb\TwoFactorBundle\Security\Authorization\TwoFactorAccessDecider {#581 …}
}
 0.22 ms (none) 
Symfony\Component\Security\Http\Firewall\AccessListener {#579
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -accessDecisionManager: Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager {#937 …}
  -map: Symfony\Component\Security\Http\AccessMap {#722 …}
}
 0.00 ms (none) 
Symfony\Component\Security\Http\Firewall\LogoutListener {#786
  -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …}
  -options: [
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    "csrf_token_id" => "logout"
    "logout_path" => "app_logout"
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  -httpUtils: Symfony\Component\Security\Http\HttpUtils {#841 …}
  -csrfTokenManager: Symfony\Component\Security\Csrf\CsrfTokenManager {#1015 …}
  -eventDispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}
}
 0.00 ms (none)

Authenticators

No authenticators have been recorded. Check previous profiles on your authentication endpoint.

Access Decision

affirmative Strategy
# Voter class
1 
"Symfony\Component\Security\Core\Authorization\Voter\AuthenticatedVoter"
2 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
3 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
4 
"Symfony\Component\Security\Core\Authorization\Voter\ExpressionVoter"
5 
"App\Security\Voter\EntryCommentVoter"
6 
"App\Security\Voter\EntryVoter"
7 
"App\Security\Voter\MagazineVoter"
8 
"App\Security\Voter\MessageThreadVoter"
9 
"App\Security\Voter\MessageVoter"
10 
"App\Security\Voter\NotificationVoter"
11 
"App\Security\Voter\OAuth2UserConsentVoter"
12 
"App\Security\Voter\PostCommentVoter"
13 
"App\Security\Voter\PostVoter"
14 
"App\Security\Voter\UserVoter"

Access decision log

# Result Attributes Object
1 DENIED ROLE_USER 
null
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
 ACCESS DENIED 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
2 DENIED moderate 
Proxies\__CG__\App\Entity\Entry {#1526
  +user: Proxies\__CG__\App\Entity\User {#2462 …}
  +magazine: Proxies\__CG__\App\Entity\Magazine {#1566 …}
  +image: null
  +domain: Proxies\__CG__\App\Entity\Domain {#2137 …}
  +slug: "MOSFET-as-Radiation-Detector"
  +title: "MOSFET as Radiation Detector"
  +url: null
  +body: "Hello, we are making a thesis where we use MOSFETs as an alternative radiation detector. So to explain it, it works when the mosfet is irradiated with an external radiation source; its voltage threshold increases, which will be used to determine the radiation dose. I'm currently asking for help on how we measure the voltage threshold. BTW, we are using an n-channel MOSFET (model: IRFP250NPbF). Also in the datasheet provided by the manufacturer, it says here VGS(th)/Gate Threshold Voltage Min: 2.0 ––– Max: 4.0 V. There is a condition here with VDS = VGS, ID = 250 A. Does this mean that to measure the VGS, we need to first satisfy the conditions? To measure the voltage threshold, what node will we use to measure the VGS (th)? Is it at the drain to the source terminal or still at the gate to the source terminal? Feel free to share your thoughts, if you have any. I would also like to add that we have already tried to supply a voltage at the gate with respect to the source terminal. We use a 4 V supply voltage, and when we tried to measure the VDS (drain to source voltage), there was a voltage drop, so we've got a 3.5 V. Also, we are using an Arduino to measure its voltage and a multimeter for checking."
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  +lang: "en"
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    date: 2023-07-12 20:23:14.0 +02:00
  }
  +ip: null
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  +comments: Doctrine\ORM\PersistentCollection {#2073 …}
  +votes: Doctrine\ORM\PersistentCollection {#2049 …}
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  +favourites: Doctrine\ORM\PersistentCollection {#2102 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2105 …}
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    App\Entity\EntryComment {#1676
      +user: App\Entity\User {#261 …}
      +entry: Proxies\__CG__\App\Entity\Entry {#1526 …2}
      +magazine: Proxies\__CG__\App\Entity\Magazine {#1566 …}
      +image: null
      +parent: null
      +root: null
      +body: "Using MOSFETs as TID sensors is common enough. A term that you can use for more research is RADFET. The best way to measure threshold voltage is to sweep the gate voltage. In my experience however, if you intend to measure this in a non-lab environment (say, in a satellite), I would recommend that you instead connect the gate to the drain, force a small constant current (maybe 10uA) from the drain to source, and measure Vds (which is equal to Vgs in this configuration). This won't give you the threshold voltage per se, but this will produce a voltage that changes as dose accumulates, is a far easier metric to measure, and is as equally valid as measuring the threshold voltage to determine TID. You can't really predict the shift in threshold voltage according to TID unless your MOSFETs are all from the same batch (manufacturing defects and tolerances), and you need to calibrate them in order to obtain a calibration curve (this is done by simply going to irradiate several (the more the better, I suggest at least 10 for statistical significance). Alternatively, you can buy pre-calibrated ones from companies who make MOSFETs for this intended purpose like Varadis. If you really want to measure the threshold voltage, you could read MIL-STD-750, which outlines how to measure the threshold voltage."
      +lang: "en"
      +isAdult: false
      +favouriteCount: 2
      +score: 0
      +lastActive: DateTime @1689186195 {#1606
        date: 2023-07-12 20:23:15.0 +02:00
      }
      +ip: null
      +tags: null
      +mentions: [
        "@Lazyhotodogu@discuss.tchncs.de"
      ]
      +children: Doctrine\ORM\PersistentCollection {#1564 …}
      +nested: Doctrine\ORM\PersistentCollection {#1559 …}
      +votes: Doctrine\ORM\PersistentCollection {#1567 …}
      +reports: Doctrine\ORM\PersistentCollection {#1561 …}
      +favourites: Doctrine\ORM\PersistentCollection {#1554 …}
      +notifications: Doctrine\ORM\PersistentCollection {#1583 …}
      -id: 1118
      -bodyTs: "'10':185 '10ua':71 '750':223 'accord':139 'accumul':108 'altern':189 'batch':150 'best':21 'better':180 'buy':192 'calibr':159,166,195 'chang':105 'common':7 'compani':198 'configur':87 'connect':59 'constant':68 'could':218 'current':69 'curv':167 'defect':152 'determin':127 'done':170 'dose':107 'drain':64,74 'easier':112 'enough':8 'environ':48 'equal':82,119 'experi':35 'far':111 'forc':65 'gate':31,61 'give':91 'go':173 'howev':36 'instead':58 'intend':39,204 'irradi':175 'lab':47 'least':184 'like':206 'make':200 'manufactur':151 'mayb':70 'measur':24,41,78,115,122,213,228 'metric':113 'mil':221 'mil-std':220 'mosfet':2,144,201 'need':157 'non':46 'non-lab':45 'obtain':164 'one':196 'order':162 'outlin':225 'per':96 'pre':194 'pre-calibr':193 'predict':133 'produc':101 'purpos':205 'radfet':19 'read':219 'realli':132,210 'recommend':55 'research':17 'satellit':52 'say':49 'se':97 'sensor':5 'sever':176 'shift':135 'signific':188 'simpli':172 'small':67 'sourc':76 'statist':187 'std':222 'suggest':182 'sweep':29 'term':10 'threshold':25,94,124,137,215,230 'tid':4,128,141 'toler':154 'unless':142 'use':1,14 'valid':120 'varadi':207 'vds':79 'vgs':84 'voltag':26,32,95,103,125,138,216,231 'want':211 'way':22 'won':89 'would':54"
      +ranking: 0
      +commentCount: 0
      +upVotes: 0
      +downVotes: 0
      +visibility: "visible             "
      +apId: "https://lemmy.world/comment/348462"
      +editedAt: null
      +createdAt: DateTimeImmutable @1687177876 {#1752
        date: 2023-06-19 14:31:16.0 +02:00
      }
      +"title": 1118
    }
  ]
  -id: 135
  -titleTs: "'detector':4 'mosfet':1 'radiat':3"
  -bodyTs: "'/gate':82 '2.0':86 '250':99 '3.5':212 '4':186 '4.0':88 'add':164 'alreadi':168 'also':69,161,214 'altern':13 'arduino':219 'ask':48 'btw':58 'channel':65 'check':228 'condit':93,115 'current':47 'datasheet':72 'detector':15 'determin':41 'dose':44 'drain':135,198 'drop':206 'explain':18 'extern':29 'feel':149 'first':112 'free':150 'gate':144,176 'got':210 'hello':1 'help':50 'id':98 'increas':35 'irfp250npbf':68 'irradi':26 'like':162 'm':46 'make':4 'manufactur':76 'max':87 'mean':103 'measur':54,106,117,127,195,221 'min':85 'model':67 'mosfet':10,24,66 'multimet':226 'n':64 'n-channel':63 'need':110 'node':122 'provid':73 'radiat':14,30,43 'respect':178 'satisfi':113 'say':78 'share':152 'sourc':31,138,147,181,200 'still':141 'suppli':171,188 'termin':139,148,182 'th':81,130 'thesi':6 'thought':154 'threshold':34,57,83,120 'tri':169,193 'use':9,39,61,125,184,217 'v':89,187,213 'vds':96,197 've':209 'vgs':80,97,108,129 'voltag':33,56,84,119,173,189,201,205,223 'work':21 'would':160"
  +cross: false
  +upVotes: 0
  +downVotes: 0
  +ranking: 1687237046
  +visibility: "visible             "
  +apId: "https://discuss.tchncs.de/post/156149"
  +editedAt: null
  +createdAt: DateTimeImmutable @1687153046 {#1674
    date: 2023-06-19 07:37:26.0 +02:00
  }
  +__isInitialized__: true
   …2
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS DENIED 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
3 DENIED edit 
Proxies\__CG__\App\Entity\Entry {#1526
  +user: Proxies\__CG__\App\Entity\User {#2462 …}
  +magazine: Proxies\__CG__\App\Entity\Magazine {#1566 …}
  +image: null
  +domain: Proxies\__CG__\App\Entity\Domain {#2137 …}
  +slug: "MOSFET-as-Radiation-Detector"
  +title: "MOSFET as Radiation Detector"
  +url: null
  +body: "Hello, we are making a thesis where we use MOSFETs as an alternative radiation detector. So to explain it, it works when the mosfet is irradiated with an external radiation source; its voltage threshold increases, which will be used to determine the radiation dose. I'm currently asking for help on how we measure the voltage threshold. BTW, we are using an n-channel MOSFET (model: IRFP250NPbF). Also in the datasheet provided by the manufacturer, it says here VGS(th)/Gate Threshold Voltage Min: 2.0 ––– Max: 4.0 V. There is a condition here with VDS = VGS, ID = 250 A. Does this mean that to measure the VGS, we need to first satisfy the conditions? To measure the voltage threshold, what node will we use to measure the VGS (th)? Is it at the drain to the source terminal or still at the gate to the source terminal? Feel free to share your thoughts, if you have any. I would also like to add that we have already tried to supply a voltage at the gate with respect to the source terminal. We use a 4 V supply voltage, and when we tried to measure the VDS (drain to source voltage), there was a voltage drop, so we've got a 3.5 V. Also, we are using an Arduino to measure its voltage and a multimeter for checking."
  +type: "article"
  +lang: "en"
  +isOc: false
  +hasEmbed: false
  +commentCount: 15
  +favouriteCount: 14
  +score: 0
  +isAdult: false
  +sticky: false
  +lastActive: DateTime @1689186194 {#1718
    date: 2023-07-12 20:23:14.0 +02:00
  }
  +ip: null
  +adaAmount: 0
  +tags: null
  +mentions: null
  +comments: Doctrine\ORM\PersistentCollection {#2073 …}
  +votes: Doctrine\ORM\PersistentCollection {#2049 …}
  +reports: Doctrine\ORM\PersistentCollection {#2070 …}
  +favourites: Doctrine\ORM\PersistentCollection {#2102 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2105 …}
  +badges: Doctrine\ORM\PersistentCollection {#2115 …}
  +children: [
    App\Entity\EntryComment {#1676
      +user: App\Entity\User {#261 …}
      +entry: Proxies\__CG__\App\Entity\Entry {#1526 …2}
      +magazine: Proxies\__CG__\App\Entity\Magazine {#1566 …}
      +image: null
      +parent: null
      +root: null
      +body: "Using MOSFETs as TID sensors is common enough. A term that you can use for more research is RADFET. The best way to measure threshold voltage is to sweep the gate voltage. In my experience however, if you intend to measure this in a non-lab environment (say, in a satellite), I would recommend that you instead connect the gate to the drain, force a small constant current (maybe 10uA) from the drain to source, and measure Vds (which is equal to Vgs in this configuration). This won't give you the threshold voltage per se, but this will produce a voltage that changes as dose accumulates, is a far easier metric to measure, and is as equally valid as measuring the threshold voltage to determine TID. You can't really predict the shift in threshold voltage according to TID unless your MOSFETs are all from the same batch (manufacturing defects and tolerances), and you need to calibrate them in order to obtain a calibration curve (this is done by simply going to irradiate several (the more the better, I suggest at least 10 for statistical significance). Alternatively, you can buy pre-calibrated ones from companies who make MOSFETs for this intended purpose like Varadis. If you really want to measure the threshold voltage, you could read MIL-STD-750, which outlines how to measure the threshold voltage."
      +lang: "en"
      +isAdult: false
      +favouriteCount: 2
      +score: 0
      +lastActive: DateTime @1689186195 {#1606
        date: 2023-07-12 20:23:15.0 +02:00
      }
      +ip: null
      +tags: null
      +mentions: [
        "@Lazyhotodogu@discuss.tchncs.de"
      ]
      +children: Doctrine\ORM\PersistentCollection {#1564 …}
      +nested: Doctrine\ORM\PersistentCollection {#1559 …}
      +votes: Doctrine\ORM\PersistentCollection {#1567 …}
      +reports: Doctrine\ORM\PersistentCollection {#1561 …}
      +favourites: Doctrine\ORM\PersistentCollection {#1554 …}
      +notifications: Doctrine\ORM\PersistentCollection {#1583 …}
      -id: 1118
      -bodyTs: "'10':185 '10ua':71 '750':223 'accord':139 'accumul':108 'altern':189 'batch':150 'best':21 'better':180 'buy':192 'calibr':159,166,195 'chang':105 'common':7 'compani':198 'configur':87 'connect':59 'constant':68 'could':218 'current':69 'curv':167 'defect':152 'determin':127 'done':170 'dose':107 'drain':64,74 'easier':112 'enough':8 'environ':48 'equal':82,119 'experi':35 'far':111 'forc':65 'gate':31,61 'give':91 'go':173 'howev':36 'instead':58 'intend':39,204 'irradi':175 'lab':47 'least':184 'like':206 'make':200 'manufactur':151 'mayb':70 'measur':24,41,78,115,122,213,228 'metric':113 'mil':221 'mil-std':220 'mosfet':2,144,201 'need':157 'non':46 'non-lab':45 'obtain':164 'one':196 'order':162 'outlin':225 'per':96 'pre':194 'pre-calibr':193 'predict':133 'produc':101 'purpos':205 'radfet':19 'read':219 'realli':132,210 'recommend':55 'research':17 'satellit':52 'say':49 'se':97 'sensor':5 'sever':176 'shift':135 'signific':188 'simpli':172 'small':67 'sourc':76 'statist':187 'std':222 'suggest':182 'sweep':29 'term':10 'threshold':25,94,124,137,215,230 'tid':4,128,141 'toler':154 'unless':142 'use':1,14 'valid':120 'varadi':207 'vds':79 'vgs':84 'voltag':26,32,95,103,125,138,216,231 'want':211 'way':22 'won':89 'would':54"
      +ranking: 0
      +commentCount: 0
      +upVotes: 0
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      +visibility: "visible             "
      +apId: "https://lemmy.world/comment/348462"
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      +createdAt: DateTimeImmutable @1687177876 {#1752
        date: 2023-06-19 14:31:16.0 +02:00
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      +"title": 1118
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  -id: 135
  -titleTs: "'detector':4 'mosfet':1 'radiat':3"
  -bodyTs: "'/gate':82 '2.0':86 '250':99 '3.5':212 '4':186 '4.0':88 'add':164 'alreadi':168 'also':69,161,214 'altern':13 'arduino':219 'ask':48 'btw':58 'channel':65 'check':228 'condit':93,115 'current':47 'datasheet':72 'detector':15 'determin':41 'dose':44 'drain':135,198 'drop':206 'explain':18 'extern':29 'feel':149 'first':112 'free':150 'gate':144,176 'got':210 'hello':1 'help':50 'id':98 'increas':35 'irfp250npbf':68 'irradi':26 'like':162 'm':46 'make':4 'manufactur':76 'max':87 'mean':103 'measur':54,106,117,127,195,221 'min':85 'model':67 'mosfet':10,24,66 'multimet':226 'n':64 'n-channel':63 'need':110 'node':122 'provid':73 'radiat':14,30,43 'respect':178 'satisfi':113 'say':78 'share':152 'sourc':31,138,147,181,200 'still':141 'suppli':171,188 'termin':139,148,182 'th':81,130 'thesi':6 'thought':154 'threshold':34,57,83,120 'tri':169,193 'use':9,39,61,125,184,217 'v':89,187,213 'vds':96,197 've':209 'vgs':80,97,108,129 'voltag':33,56,84,119,173,189,201,205,223 'work':21 'would':160"
  +cross: false
  +upVotes: 0
  +downVotes: 0
  +ranking: 1687237046
  +visibility: "visible             "
  +apId: "https://discuss.tchncs.de/post/156149"
  +editedAt: null
  +createdAt: DateTimeImmutable @1687153046 {#1674
    date: 2023-06-19 07:37:26.0 +02:00
  }
  +__isInitialized__: true
   …2
}
 
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\EntryVoter"
 ACCESS DENIED 
"App\Security\Voter\MagazineVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageThreadVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\MessageVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\NotificationVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\OAuth2UserConsentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostCommentVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\PostVoter"
 ACCESS ABSTAIN 
"App\Security\Voter\UserVoter"
 ACCESS ABSTAIN
Show voter details
4 DENIED moderate 
Proxies\__CG__\App\Entity\Entry {#1526
  +user: Proxies\__CG__\App\Entity\User {#2462 …}
  +magazine: Proxies\__CG__\App\Entity\Magazine {#1566 …}
  +image: null
  +domain: Proxies\__CG__\App\Entity\Domain {#2137 …}
  +slug: "MOSFET-as-Radiation-Detector"
  +title: "MOSFET as Radiation Detector"
  +url: null
  +body: "Hello, we are making a thesis where we use MOSFETs as an alternative radiation detector. So to explain it, it works when the mosfet is irradiated with an external radiation source; its voltage threshold increases, which will be used to determine the radiation dose. I'm currently asking for help on how we measure the voltage threshold. BTW, we are using an n-channel MOSFET (model: IRFP250NPbF). Also in the datasheet provided by the manufacturer, it says here VGS(th)/Gate Threshold Voltage Min: 2.0 ––– Max: 4.0 V. There is a condition here with VDS = VGS, ID = 250 A. Does this mean that to measure the VGS, we need to first satisfy the conditions? To measure the voltage threshold, what node will we use to measure the VGS (th)? Is it at the drain to the source terminal or still at the gate to the source terminal? Feel free to share your thoughts, if you have any. I would also like to add that we have already tried to supply a voltage at the gate with respect to the source terminal. We use a 4 V supply voltage, and when we tried to measure the VDS (drain to source voltage), there was a voltage drop, so we've got a 3.5 V. Also, we are using an Arduino to measure its voltage and a multimeter for checking."
  +type: "article"
  +lang: "en"
  +isOc: false
  +hasEmbed: false
  +commentCount: 15
  +favouriteCount: 14
  +score: 0
  +isAdult: false
  +sticky: false
  +lastActive: DateTime @1689186194 {#1718
    date: 2023-07-12 20:23:14.0 +02:00
  }
  +ip: null
  +adaAmount: 0
  +tags: null
  +mentions: null
  +comments: Doctrine\ORM\PersistentCollection {#2073 …}
  +votes: Doctrine\ORM\PersistentCollection {#2049 …}
  +reports: Doctrine\ORM\PersistentCollection {#2070 …}
  +favourites: Doctrine\ORM\PersistentCollection {#2102 …}
  +notifications: Doctrine\ORM\PersistentCollection {#2105 …}
  +badges: Doctrine\ORM\PersistentCollection {#2115 …}
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    +slug: "MOSFET-as-Radiation-Detector"
    +title: "MOSFET as Radiation Detector"
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    +body: "Hello, we are making a thesis where we use MOSFETs as an alternative radiation detector. So to explain it, it works when the mosfet is irradiated with an external radiation source; its voltage threshold increases, which will be used to determine the radiation dose. I'm currently asking for help on how we measure the voltage threshold. BTW, we are using an n-channel MOSFET (model: IRFP250NPbF). Also in the datasheet provided by the manufacturer, it says here VGS(th)/Gate Threshold Voltage Min: 2.0 ––– Max: 4.0 V. There is a condition here with VDS = VGS, ID = 250 A. Does this mean that to measure the VGS, we need to first satisfy the conditions? To measure the voltage threshold, what node will we use to measure the VGS (th)? Is it at the drain to the source terminal or still at the gate to the source terminal? Feel free to share your thoughts, if you have any. I would also like to add that we have already tried to supply a voltage at the gate with respect to the source terminal. We use a 4 V supply voltage, and when we tried to measure the VDS (drain to source voltage), there was a voltage drop, so we've got a 3.5 V. Also, we are using an Arduino to measure its voltage and a multimeter for checking."
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  +body: "Using MOSFETs as TID sensors is common enough. A term that you can use for more research is RADFET. The best way to measure threshold voltage is to sweep the gate voltage. In my experience however, if you intend to measure this in a non-lab environment (say, in a satellite), I would recommend that you instead connect the gate to the drain, force a small constant current (maybe 10uA) from the drain to source, and measure Vds (which is equal to Vgs in this configuration). This won't give you the threshold voltage per se, but this will produce a voltage that changes as dose accumulates, is a far easier metric to measure, and is as equally valid as measuring the threshold voltage to determine TID. You can't really predict the shift in threshold voltage according to TID unless your MOSFETs are all from the same batch (manufacturing defects and tolerances), and you need to calibrate them in order to obtain a calibration curve (this is done by simply going to irradiate several (the more the better, I suggest at least 10 for statistical significance). Alternatively, you can buy pre-calibrated ones from companies who make MOSFETs for this intended purpose like Varadis. If you really want to measure the threshold voltage, you could read MIL-STD-750, which outlines how to measure the threshold voltage."
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