Laser Measurement
Laser Measurement
(OP)
I am trying to locate a laser measurement sensor (diffuse style because range is up to 8 feet) which operates in -40C to 70C environments. All the ones I have found are -10 - 50C. Anyone have any suggestions as I continue to review all the laser sensor mfgs websites?





RE: Laser Measurement
Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.
RE: Laser Measurement
I would appreciate if you could tell me the URL
of the companies you have found.
If you tell me more perhaps I can help with a solution.
RE: Laser Measurement
Thanks in advance.
RE: Laser Measurement
Speed and acceleration of the target?
Max. size and weight of the retro reflector?
Accuracy?
Is the zero calibration on turn-on acceptable?
Pressure range ?
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: Laser Measurement
Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.
RE: Laser Measurement
http:
TTFN
RE: Laser Measurement
http://www.trelectronic.com/
They have quite a selection of laser measurement devices.
----------------------------------
If we learn from our mistakes,
I'm getting a great education!
RE: Laser Measurement
Here is more info.
range - 0 to 8'
pressure - atmospheric
humidity - 100% desired but likely hard to find w/o paying way to much
acceleration - really slow
speed - perhaps 6"/minute
accuracy - +-0.25%
linearity - 0.1%
one time calibration at set-up not start-up, in other
words, we would set the zero and span when we install
the unit for the first time and it would have non-
volatile memory
retroreflective should fit on top of a 3" diameter shaft where weight is not an issue (I thought all these were basically plastiv).
RE: Laser Measurement
RE: Laser Measurement
RE: Laser Measurement
( can be submicron ), can follow you speed specs but
it looses the zero when you turn it off or interrupt
the beam and needs rezeroing.
You could compensate for the temperature.
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: Laser Measurement
Anyone use any other photoelectrics with this temp range? Problem here is the enclosure the sensor is in may be heated but the medium the 'light' passes through will not so it would be nice if the sensor was not heated so any temp correction built-in to the sensor could be used. I am guessing, however, that the speed of light is minimally affected (if at all) by temperature variations unlike sound waves so maybe this is not a big deal. Anyone know if this is semi true or not?
Thanks for all the help.
RE: Laser Measurement
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: Laser Measurement
the laser emits two frequencies ( around 2MHz apart)
This is multiplied by a PLL and a counter compares the doppler shifted with the reference .
I am using them and they are very reliable.
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: Laser Measurement
One of the units someone posted above has a heated enclosure to accomadate the wide temp range. I was thinking this would help the electronics but not the medium the beam travels through. I am guessing it is not even a consideration at this small distance, maybe I am wrong.
Thanks again.