Doubt about laser power in laser transmitter

AI Thread Summary
When designing a laser torch audio transmitter and receiver, the minimum power of the laser is influenced by the distance it needs to cover, ranging from a few inches to several miles. For short distances, like half an inch, minimal power is sufficient, while longer ranges, such as 100 meters, require more power to ensure detection. A laser diode that is visibly bright can typically be detected by a phototransistor like the 2N5777 at significant distances under good conditions. Understanding link budgets is crucial for calculating the necessary power and ensuring effective communication. Proper planning and knowledge of these factors will enhance the performance of the laser transmitter and receiver setup.
NOMI_2009
Messages
3
Reaction score
0
I'm making a laser torch based audio transmitter n receiver using 2n5777 phototransistor as receiver what must be the min power of the torch
 
Engineering news on Phys.org
How far are you shooting this laser? .5 inch? a foot? a hundred yards? 20 miles? This will affect your required strength
 
range is about .5 inch
 
If you are running a laser diode with enough current so you can see it yourself, you will should be able to detect it with almost any photodiode 100 meters away in decent conditions, easy!
 
I used to be an HVAC technician. One time I had a service call in which there was no power to the thermostat. The thermostat did not have power because the fuse in the air handler was blown. The fuse in the air handler was blown because there was a low voltage short. The rubber coating on one of the thermostat wires was chewed off by a rodent. The exposed metal in the thermostat wire was touching the metal cabinet of the air handler. This was a low voltage short. This low voltage...
Hey guys. I have a question related to electricity and alternating current. Say an alien fictional society developed electricity, and settled on a standard like 73V AC current at 46 Hz. How would appliances be designed, and what impact would the lower frequency and voltage have on transformers, wiring, TVs, computers, LEDs, motors, and heating, assuming the laws of physics and technology are the same as on Earth?
Thread 'Electromagnet magnetic field issue'
Hi Guys We are a bunch a mechanical engineers trying to build a simple electromagnet. Our design is based on a very similar magnet. However, our version is about 10 times less magnetic and we are wondering why. Our coil has exactly same length, same number of layers and turns. What is possibly wrong? PIN and bracket are made of iron and are in electrical contact, exactly like the reference design. Any help will be appreciated. Thanks. edit: even same wire diameter and coil was wounded by a...
Back
Top