Questions tagged [photometry]

Anything related to *photometry*, the field of physics that study the theory and the techniques used to measure light as it is perceived by the human eye. In engineering photometry is applied especially to all problems of lighting design.

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Laser characterization setup

I was trying to design a setup to measure a laser beam's wavelength and (hopefully) its intensity (\$W/m^2\$). I mainly plan to work in the visible spectrum with intensities between 200 and 900 \$W/m^...
Arturo Ruiz's user avatar
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Do you have any suggestions for revisions of this schematic?

I have this schematic: Source: https://drive.google.com/file/d/1CbRIJQbl0sYk1aCY0UPvfPe7hDIebd2M/view?usp=sharing I use it for a DIY colorimeter using to tricolor RGB LED with a common cathode. I'm ...
Michael Shaya's user avatar
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2 answers
219 views

Photodiode amplification circuit

I'm going to build photodiode amplification circuit which is then connected to ADS1115 controlled by Raspberry Pi, it has sampling 3.3k. The operational amplifier I ...
Malum Wolfram's user avatar
-1 votes
2 answers
378 views

Procedure to express radiantion intensity of a LED in watts/cm^2 , given luminous intensity or total radiant power [closed]

I am calculating Responsivity of a PN junction photodiode by irradiating radiation from LED sources. For this purpose, I have two LEDs, one UV and another green LED. Note that LEDs are placed close to ...
abhishek bhat's user avatar
1 vote
1 answer
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Estimation of single photon signal from photomultiplier tube data

I am trying to estimate the peak of a single photon signal in the oscilloscope by looking at the datasheet of the PMT (I am using Hamamatsu H7195 but the picture below is just for illustrative ...
cZe99's user avatar
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1 answer
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Causes for Saturation in Transimpedance Amplifier Circuit

I have a transimpedance amplifier circuit with a Silicon Photomultiplier as shown below: simulate this circuit – Schematic created using CircuitLab We're using the SensL MicroFJ-60035 Silicon ...
BestQualityVacuum's user avatar
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1 answer
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Using on-board amplifiers instead of external amplifiers

I'm trying to replicate a Silicon Photomultiplier array multiplexing scheme by SensL. The link to their application note is found here: http://sensl.com/downloads/ds/TN-...
BestQualityVacuum's user avatar
2 votes
5 answers
1k views

Timing Improvements to Silicon Photomultiplier Transimpedance Amplifier Circuit

I'm designing another Silicon Photomultiplier circuit. Right now, it is in the theoretical stage. My team and I have made numerous circuits, and the basic template is below: simulate this circuit &...
BestQualityVacuum's user avatar
1 vote
1 answer
72 views

Can photocells (PN Juctions) be stacked?

Can photocells (the PN junctions) be stacked (3) on top of each other (not just side-by-side) to let each PN junction produce electrical energy from the visible light, Infrared (IR) and ultraviolet ...
Bill's user avatar
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2 answers
197 views

Crosstalk issues with Photomultiplier Circuit

I'm working on a circuit involving Silicon Photomultipliers. Two SiPMs are in parallel together, and they go to a feedback amplifier circuit where the current signal gets filtered and converted into a ...
BestQualityVacuum's user avatar
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2 answers
676 views

Is electric power equal to its radiant flux? [closed]

I just want to ask, is electric power equal to radiant flux? In calculating intensity, it is the total light power emitted (radiant flux) divided by the surface unit area.
Ralph Bryan's user avatar
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2 answers
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Does air flowing over a bulb affect the amount of lumens produced? [closed]

If a bulb is cooled by air flowing over it, would that change the way light is emitted? I see contradicting evidence that air cooling bulbs changes how much light is emitted because the cooler air ...
evu's user avatar
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