Recent content by Valentin

This is a good question. I am working on 2 projects, one is an IR illuminator with an oval beam 20/40° with radiant intensity up to 500mW/sr. The other project is an IR indicator with diffused beam and very low intensity, in the range of practically uW/sr. I need to create for the first one an...

In the LED industry, the radiant intensity of IR LEDs is always specified in mW/sr. So I imagine that such equipment exists.

I was talking about a goniophotometer we use for other things and mentioned it as an example of the measurement PROCEDURE I am looking for. No, I have no intention to measure radiant intensity with a lux meter. This is what I wrote in the only reply where I mentioned the word "lux" Maybe my...

So if I take a sensor that measures in W/cm^2 with a surface of 1cm^2 placed it at 1m, I just multiply the measured value by 10,000 and that's it?

Everything is OK Dave, simply the discussion was going in another direction. Meanwhile I found a Chinese device that according to what they claim is measuring in mW/sr and has a setting of the distance. God knows if it is reliable or not, too good to be true.

Never thought about it, thanks for the "illumination". I asked a simple question, if anyone knows if there is any instrument capable to measure W/sr, I don't need a lecture about what a steradian is or ways to go around with conversions. To explain my point, we have at work a goniophotometer we...

The source is an IR lambertian LED, collimated to an oval beam of 20/40°. I need to measure the radiant intensity at several points/coordinates. Many sensors are 1cm diameter so I believe it fills the sensor's surface. The question is if there is any instrument capable of measuring directly in...

This is not a problem, I can place the sensor at a known distance, say 1m. I assume that also the sensor's diameter/surface is a factor?

I am an electronics engineer and work as a designer of automotive LED lights

Hello everyone, I need to make measurements of a collimated infrared light source at different angles, practically to create an intensity map, all this in mW/sr. I can't find any equipment able to measure in mW/sr, while there are plenty of instruments capable to measure in mW/cm^2. As I...