Burleight Wavemeter WA-2000

I just acquired one of these on ebay with my fingers crossed it would work. sadly ive not managed to get it working yet and today I found a major issue.

details here -

http://redlum.xohp.pagesperso-orange...cs/WA2000.html

after buying various bits for it, today I noticed some broken glass. I say glass its clearly a specialist part.

ive emailed burleigh (Bristol) to ask for some details on what the part does and if its replaceable, we will see how helpful they are. although if you look at closely at the photos where the sensor is, its not broken.

https://imagizer.imageshack.com/img921/6615/fj3UP3.jpg

https://imagizer.imageshack.com/img924/9146/01A1kJ.jpg

https://imagizer.imageshack.com/img923/4424/Kttnav.jpg

https://imagizer.imageshack.com/img924/7084/tVVO5I.jpg

Andy, is the broken part in there somewhere? If so, you should at least be able to see if it's coated.
Have you tried checking if they have a patent on the technology used? That might give you a clue as to what the part does.

Is it coated or etched.

But hard to say which at the moment

https://imagizer.imageshack.com/img924/8312/qPdQVy.jpg

Stab in the dark, but looking at the last picture there appears to be some colour bands. Could this be a diffraction grating?

Not looked at any schematics, but I guess this is potentially what determines what wavelength of laser is being pointed in there before feeding back into the circuitry for the readout?

Have you tried shining a white light source on/through the 'glass' to see if it diffracts?

This part is nothing to do with the input laser, the laser doesn't get to here.

This part is something to do with measuring the movement of the back and forth motion.

Fingers crossed burleigh give me a bit of info

Could still be a diffraction grating... ;)

Lol it could, but it looks silver coated

It is a linear scale, like that used for measuring position in CNC machines. It is a piece of glass with metal (usually chrome) on it and lines etched into it, which are optically sensed to produce a quadrature output from which position can be extracted.

It is almost certainly a commercial linear scale, is there by chance any markings on it? Scales are usually marked with their pitch at least etched into the chrome at one end

Quote:

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Originally Posted by krazer

It is a linear scale, like that used for measuring position in CNC machines. It is a piece of glass with metal (usually chrome) on it and lines etched into it, which are optically sensed to produce a quadrature output from which position can be extracted.

It is almost certainly a commercial linear scale, is there by chance any markings on it? Scales are usually marked with their pitch at least etched into the chrome at one end

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think is what I and Robin think it is.

I don't have any way of seeing the markings

But like I say, directly under the sensor is not broken soim not even sure if its an issue. We have the uk lem in two weeks, so im hopingwe can get it up and running then

slowmo

https://youtu.be/ZvCSyIQ3G9Q