| ??? 02/25/10 16:32 Read: times |
#173563 - comments Responding to: ???'s previous message |
a. Have a normal cone shaped holder as reflector behind each LED so that the beam would travel in a decent straight line.
why not just a small pipe Laser diodes are too expensive and loading, hence they should be avoided as light source even though the beam would be less dispersed. but are invisible which makes it less likely for an intruder to find a way to beat the system b. Multiplex the LEDs and the detectors, so that only one LED is on at a time, and the corresponding detector is checked. why you want to multiplex? c. Multiple signatures are taken after a strike to determine if the intruder is a human. 1.Kindly comment on a and b. Kindly guide as to what would be the best method for human-filtering the result. i do not see how you can do that with a row of LEDs 2.What would be the best way to stack up the scheme to increase the length and height of the fence? By multiplexing each segment? simple, make it modular and skip the multiplexing Erik |
| Topic | Author | Date |
| Perimeter intrusion detection | 01/01/70 00:00 | |
| comments | 01/01/70 00:00 | |
| human-filtering the result | 01/01/70 00:00 | |
I wonder ... | 01/01/70 00:00 | |
| What's the size (Length, width, height) of the "fence"? | 01/01/70 00:00 | |
| Muxing and filtering | 01/01/70 00:00 | |
| Machine Vision? | 01/01/70 00:00 | |
| Machine vision. | 01/01/70 00:00 | |
| The problem with machine vision | 01/01/70 00:00 | |
| Thanks Jez, but it would be expensive! | 01/01/70 00:00 | |
| Why not start by answering the questions asked? | 01/01/70 00:00 | |
| Light Curtain | 01/01/70 00:00 | |
| Answers and light curtain | 01/01/70 00:00 | |
| human filtering | 01/01/70 00:00 |