element14 Community
element14 Community
    Register Log In
  • Site
  • Search
  • Log In Register
  • About Us
  • Community Hub
    Community Hub
    • What's New on element14
    • Feedback and Support
    • Benefits of Membership
    • Personal Blogs
    • Members Area
    • Achievement Levels
  • Learn
    Learn
    • Ask an Expert
    • eBooks
    • element14 presents
    • Learning Center
    • Tech Spotlight
    • STEM Academy
    • Webinars, Training and Events
    • Learning Groups
  • Technologies
    Technologies
    • 3D Printing
    • FPGA
    • Industrial Automation
    • Internet of Things
    • Power & Energy
    • Sensors
    • Technology Groups
  • Challenges & Projects
    Challenges & Projects
    • Design Challenges
    • element14 presents Projects
    • Project14
    • Arduino Projects
    • Raspberry Pi Projects
    • Project Groups
  • Products
    Products
    • Arduino
    • Avnet Boards Community
    • Dev Tools
    • Manufacturers
    • Multicomp Pro
    • Product Groups
    • Raspberry Pi
    • RoadTests & Reviews
  • Store
    Store
    • Visit Your Store
    • Choose another store...
      • Europe
      •  Austria (German)
      •  Belgium (Dutch, French)
      •  Bulgaria (Bulgarian)
      •  Czech Republic (Czech)
      •  Denmark (Danish)
      •  Estonia (Estonian)
      •  Finland (Finnish)
      •  France (French)
      •  Germany (German)
      •  Hungary (Hungarian)
      •  Ireland
      •  Israel
      •  Italy (Italian)
      •  Latvia (Latvian)
      •  
      •  Lithuania (Lithuanian)
      •  Netherlands (Dutch)
      •  Norway (Norwegian)
      •  Poland (Polish)
      •  Portugal (Portuguese)
      •  Romania (Romanian)
      •  Russia (Russian)
      •  Slovakia (Slovak)
      •  Slovenia (Slovenian)
      •  Spain (Spanish)
      •  Sweden (Swedish)
      •  Switzerland(German, French)
      •  Turkey (Turkish)
      •  United Kingdom
      • Asia Pacific
      •  Australia
      •  China
      •  Hong Kong
      •  India
      •  Korea (Korean)
      •  Malaysia
      •  New Zealand
      •  Philippines
      •  Singapore
      •  Taiwan
      •  Thailand (Thai)
      • Americas
      •  Brazil (Portuguese)
      •  Canada
      •  Mexico (Spanish)
      •  United States
      Can't find the country/region you're looking for? Visit our export site or find a local distributor.
  • Translate
  • Profile
  • Settings
Sensors
  • Technologies
  • More
Sensors
Sensor Forum need guidance in selection of photodiode for my project
  • Blog
  • Forum
  • Documents
  • Quiz
  • Events
  • Polls
  • Members
  • Mentions
  • Sub-Groups
  • Tags
  • More
  • Cancel
  • New
Join Sensors to participate - click to join for free!
Actions
  • Share
  • More
  • Cancel
Forum Thread Details
  • Replies 12 replies
  • Subscribers 336 subscribers
  • Views 457 views
  • Users 0 members are here
Related

need guidance in selection of photodiode for my project

hasamsiddiqui
hasamsiddiqui 15 days ago

I am currently working on a project to develop a fibre optic dosimetry system. The system uses an organic scintillator (BCF-60), which emits green light at 530 nm, with an active volume of 0.8 mm³.

I am in the process of designing a transimpedance amplifier (TIA) circuit using different photodetectors, which I selected based on their spectral response range (360 nm to 900 nm).

Could you please guide me on the key tests I should perform to help select the most reliable and suitable photodiode for my application?

I am planning to test the TIA response using different LEDs (blue, green, red, and IR). I would appreciate your suggestions on any additional quick and effective tests I could perform to further characterize the photodiodes for use in my dosimetry system.

In TIA cct I used Rf 100k and 741 opamp.

Kindly please guide..

Kind regards

Hasham

...image

  • Sign in to reply
  • Cancel

Top Replies

  • michaelkellett
    michaelkellett 15 days ago in reply to hasamsiddiqui +3
    It would be hard to think of a less suitable op-amp than the 741 to use with a fancy photo-diode. (I picked one of your selection at random and noticed that it costs £17.) Why are you biasing the photo…
  • michaelkellett
    michaelkellett 10 days ago in reply to hasamsiddiqui +3
    This is a tricky problem (and a long way from what I know much about which is gas detection with NDIR detectors) You need to somehow work out how much power gets into the fibre, and then how well you…
  • shabaz
    shabaz 15 days ago in reply to hasamsiddiqui +2
    You've already narrowed it down to the selection you listed, so maybe just try your top two or three selections, see which one meets your needs? What I don't understand, is you've mentioned 0.8 mm3 volume…
Parents
  • hasamsiddiqui
    hasamsiddiqui 15 days ago

    image

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Cancel
  • michaelkellett
    michaelkellett 15 days ago in reply to hasamsiddiqui

    It would be hard to think of a less suitable op-amp than the 741 to use with a fancy photo-diode. (I picked one of your selection at random and noticed that it costs £17.)

    Why are you biasing the photo diode with an AC source ?

    I suspect that you are not equipped to measure the reliability of the photo diode - just buy from a reputable source and operate it well within ratings for reverse bias etc.

    Do some reading about photo diode trans impedance amplifiers (DuckDuckGo or Google it).

    Here are some starters:

    https://www.ti.com/lit/pdf/tidu535

    www.ti.com/.../SSZTBC4

    https://www.allaboutcircuits.com/technical-articles/design-tips-for-photodiode-amplifiers/

    If possible you should start by measuring the photo current coming out of your test devices before you attempt to design an amplifier of your own.

    Something like this would do:

    https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1003

    (There are other suppliers

    https://www.aliexpress.com/item/1005005324917603.html

    )

    MK

    • Cancel
    • Vote Up +3 Vote Down
    • Sign in to reply
    • Cancel
  • hasamsiddiqui
    hasamsiddiqui 15 days ago in reply to michaelkellett

    Hi,

    THnaks for your reply and sharing links..

    I plan to use the OPA657 op-amp, as the 741 op-amp has higher noise and is not suitable for this application.

    if you don't mind, I would appreciate your guidance on how to characterize different photodiodes to help me select the most suitable one for my project.

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Cancel
  • shabaz
    shabaz 15 days ago in reply to hasamsiddiqui

    You've already narrowed it down to the selection you listed, so maybe just try your top two or three selections, see which one meets your needs?

    What I don't understand, is you've mentioned 0.8 mm3 volume, yet from the photos, each of the selected photo diodes look large (I have not looked at their datasheets). However much light are you expecting? Is it an extremely tiny amount? If so then maybe SPADs are a better choice than photodiode? See here:

     The Use of SiPMs in the Life Sciences 

    I could be very wrong since I'm not knowledgeable in your subject area.

    • Cancel
    • Vote Up +2 Vote Down
    • Sign in to reply
    • Cancel
Reply
  • shabaz
    shabaz 15 days ago in reply to hasamsiddiqui

    You've already narrowed it down to the selection you listed, so maybe just try your top two or three selections, see which one meets your needs?

    What I don't understand, is you've mentioned 0.8 mm3 volume, yet from the photos, each of the selected photo diodes look large (I have not looked at their datasheets). However much light are you expecting? Is it an extremely tiny amount? If so then maybe SPADs are a better choice than photodiode? See here:

     The Use of SiPMs in the Life Sciences 

    I could be very wrong since I'm not knowledgeable in your subject area.

    • Cancel
    • Vote Up +2 Vote Down
    • Sign in to reply
    • Cancel
Children
No Data
element14 Community

element14 is the first online community specifically for engineers. Connect with your peers and get expert answers to your questions.

  • Members
  • Learn
  • Technologies
  • Challenges & Projects
  • Products
  • Store
  • About Us
  • Feedback & Support
  • FAQs
  • Terms of Use
  • Privacy Policy
  • Legal and Copyright Notices
  • Sitemap
  • Cookies

An Avnet Company © 2025 Premier Farnell Limited. All Rights Reserved.

Premier Farnell Ltd, registered in England and Wales (no 00876412), registered office: Farnell House, Forge Lane, Leeds LS12 2NE.

ICP 备案号 10220084.

Follow element14

  • X
  • Facebook
  • linkedin
  • YouTube