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Laser fence notes....

roughshawd

Jul 13, 2020
249
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Jul 13, 2020
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Does anyone in know the distance that a small modular laser can be separated from a modular eye before it fails?
 

73's de Edd

Aug 21, 2015
3,432
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Aug 21, 2015
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Probably, if using a linear tube shielded sensor, the range will be s o o o o o o great that the REAL snag is the bobbling of the laser beam off from alignment upon the receive sensor
( Thought ? . . .additionally incorporate a small Fresnel lens . . . frontal of the sensor ) AND / OR any temporary blocking of the beam AND / OR beam diffusing weather conditions . . . . . would all be the main contributional limiting factors.

ASIDE THOUGHT / REMEMBRANCE . . . . .

Wanna see a real light show ?
Then, sometimes at night, hit a SCOTCHLITE covered STOP sign at an intersection with a red laser pointers beam from about a 1/2 block away.
I've had an oncoming car to that sign, come to a very early on and abrupt stop, to then just do a drop jaw attempt, to try to figure out. . . . .
HOW is that stop sign doing that ?

(if pulsing off . . .there is even being a slight RED afterglow.)
Matter of fact, quick off-on pulsing is being preferred . . .since no tell-tale lateral laser trail line , will be seen.

AFTER THOUGHT . . . . . . .
If being about 80 years younger . . . . I would be out at the corner of the house . . . mounting a red laser pointer and aiming, it dead center, at the stop sign at the end of the block.
The pointer gets activated by a proximity detector switch facing the street in front of the house.
The only REAL work then left, is jury rigging up a 2 Pulses Per Second power pulsing circuit for the laser supply.

.
 
Last edited:

Nanren888

Nov 8, 2015
623
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Nov 8, 2015
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623
In sunlight?
modular - not sure whether this is a brand, style.
.
Even cheap lasers are bright & collimated to a degree.
Is it modulated, pulsed? That would help a lot with detection.
The job is to tell there from not there. The more you can do to make the difference great the better.
 
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