Actions
Forum Thread Details
  • Replies 8 replies
  • Subscribers 301 subscribers
  • Views 931 views
  • Users 0 members are here
Related
See a helpful answer?

Be sure to click 'more' and select 'suggest as answer'!

If you're the thread creator, be sure to click 'more' then 'Verify as Answer'!

Electronics Novice

gjfield

Hello, I am trying to help a student who would like to build a LASER Harp, which sounds pretty inspiring. I know very little about LASER Diodes, but some of the components listed here seem to be able to detect signal in addition to transmit. Has anyone worked with these gadgets before - is it just a case of configuring the device differently for detection versus emission? (Data sheet suggest so, but I am not sure) - Also, 1.1mW sounds approximately Class II, so I am guessing moderately safe? Any advice gratefully received

Parents

  • You would need one light sensor such as a photo diode or a photo transistor for each string.

    You could also have a laser emitter for each string, but if each sensor is just focused on a small area, the whole line of stings can have the same light source. You can make the sensor only see a small area by putting a long thin black tube in front of it. If the tube has a 1 mm inner diameter and is 100 mm long, the spot it sees 300 mm from the tube opening is only 3 mm.

Reply

  • You would need one light sensor such as a photo diode or a photo transistor for each string.

    You could also have a laser emitter for each string, but if each sensor is just focused on a small area, the whole line of stings can have the same light source. You can make the sensor only see a small area by putting a long thin black tube in front of it. If the tube has a 1 mm inner diameter and is 100 mm long, the spot it sees 300 mm from the tube opening is only 3 mm.

Children
No Data