Timeline for Unexpected Response from Photodiode Being Used to Measure Laser Irradiance
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 3 at 19:48 | answer | added | LeThrill | timeline score: 2 | |
| Dec 2 at 16:37 | comment | added | LeThrill | About the fact the blue signal is being high pass filtered do you think it could be caused by the capacitor if it were soldered poorly? | |
| Dec 1 at 4:29 | answer | added | Simon Fitch | timeline score: 0 | |
| Dec 1 at 3:28 | comment | added | Simon Fitch | The circuitry for diode A, the (battery-powered) circuitry for diode B, and the oscilloscope must all share a common ground, which is not shown in your schematic, making it impossible to know what signal to expect from B. Show this ground and oscilloscope probe point, please. | |
| Dec 1 at 2:38 | comment | added | D.A.S. | Does your DSO have enough BW to capture accurate peaks? an integrator might be needed. | |
| Dec 1 at 2:33 | comment | added | user1850479 | The blue signal is being high pass filtered, meaning no DC current path is present. Assuming you built the circuit exactly as drawn, my guess is a bad solder joint. | |
| Dec 1 at 2:04 | comment | added | D.A.S. | Irradiance is flux density [mW/mm^2] which for a narrow beam why use a sphere to measure density? | |
| Dec 1 at 1:56 | comment | added | LeThrill | I added that as an edit, hopefully it is more clear now. | |
| Dec 1 at 1:56 | history | edited | LeThrill | CC BY-SA 4.0 |
added more information for clarity
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| Dec 1 at 0:35 | comment | added | vir | We would need at least the schematic of your setup with component values, your photodiode's datasheet, the wavelength, pulse repetition frequency and duration, and oscillograms to begin to give you a definitive answer on this one. | |
| Dec 1 at 0:34 | history | edited | LeThrill | CC BY-SA 4.0 |
edited body
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| Dec 1 at 0:30 | history | edited | toolic | CC BY-SA 4.0 |
deleted 9 characters in body
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| S Dec 1 at 0:29 | review | First questions | |||
| Dec 1 at 0:30 | |||||
| S Dec 1 at 0:29 | history | asked | LeThrill | CC BY-SA 4.0 |