All Questions
21
questions
8
votes
3
answers
2k
views
If we increased the frequency of HV-AC lines, could we get atmospheric air to excite and illuminate?
I had a thought experiment I wanted to run past some experts.
It starts with CFL light bulbs. CFL light bulbs are light bulbs that use ~500 VAC @ ~20 kHz or more to excite a gas in a light vacuum.
...
- 687
0
votes
3
answers
128
views
Why aren't there displays which explicitly emit certain frequencies?
Rather than building displays that emit RGB, why not build displays that emit certain frequencies instead? What are the technical challenges of doing this?
- 925
11
votes
1
answer
2k
views
What is the technical difference between audio CD-R(W) and data CD-R(W) discs?
I just repaired a Sony RCD-W100 CD-recorder and want to test the recorder functionality. The manual 'says' I can only use audio CD-R(W) discs. Never heard of CD-R(W) discs just for audio. On the ...
- 1,367
1
vote
2
answers
142
views
Modulator in lasercom: from theory to practice
Hello everyone!
We are working on a realisation of an optical modulator and have a
doubt. Mr Noel Miller posted already a question, but it was suggested
this community. I will repost his question ...
- 247
1
vote
2
answers
1k
views
What does the term "boresight", and what do the phrases "boresight adjustment" or "boresight calibration", mean in the context of laser scanning?
I have been studying the laser scanning literature. In doing so, I often come across the term "boresight", and the phrases "boresight adjustment" or "boresight calibration&...
- 1,281
0
votes
3
answers
875
views
A laser driver (MLD203P1) with an external Bias-Tee for modulation
As the title says, I would like to add an external Bias tee to modulate a high frequency signal into a laser diode, because the laser driver I have chosen does not have a built-in modulation circuit. ...
- 113
0
votes
2
answers
720
views
Measure laser with photoresistor (LDR)?
I want to make a simple setum, where I can measure the opacity of air. I want to use a simple laserbeam, which I shoot across the room, and on the other side I want to measure how much is blocked/...
- 378
1
vote
1
answer
289
views
Determining LED safety compliance
I have a compliance audit that has been foisted on me from on high - as part of what an external consultancy has highlighted, I now have to prove that the indicator LEDs on a board I designed a long ...
- 4,172
0
votes
2
answers
73
views
Low-cost way of shining a wide line of light, kind of like some bar code scanners do [closed]
What is a cost-effective way (say roughly $15) to shine a wide but thin beam of light, directly away from the source, so that it would project a line onto a nearby surface?
My particular beam would ...
- 103
4
votes
2
answers
2k
views
Atmospheric attenuation calculation for a 1550nm link budget
My apologies in advance if this is the wrong place to ask this question. I was told that there were some RF communications experts here, so i figured there might be some FSO experience here as well.
...
- 143
0
votes
1
answer
431
views
How to measure air quality (especially PM2.5) from distance (scanning like a LiDAR)? [closed]
I have a bit of experience in measuring PM2.5 (fine particles in the (ambient) air 2.5 micrometres or less in size) using PMS5003 sensor. This sensor uses laser, photodiode and the fact that the air ...
- 345
-3
votes
1
answer
98
views
What electronic component is this? - sensor part of particulate matter sensor [closed]
What electronic component is this?
This is a part of a laser sensor which measures particulates.
- 345
0
votes
1
answer
141
views
Develop a system to differentiate laser pointers from the ambient light based on the information collected by two arrays of digital FPA detectors
I would like to develop a system to differentiate laser pointers from
the ambient light based on the information collected by two arrays of digital FPA detectors embedded inside the cavity of a ...
- 113
0
votes
3
answers
260
views
detecting laser using solar cell and band pass filter
I need to detect a laser signal using a solar cell.
My first problem is that all I get is a current generated from the solar cell that will vary (as I understand and correct me if I'm wrong) in it's ...
- 151
0
votes
1
answer
568
views
Cheap options for a 2D position sensor
In March of 2003 Circuit Cellar published a feature article on using position sensing detectors (PSD). The project builds a 2D position sensor using a PIC16F873 as the microcontroller, an Aculux PCB ...
- 2,206