Diffuse Photoeye

Lead Maintenance · Jun 18, 2006

Hi All,

I am having trouble with a new system that uses a retroreflecive photoeye to detect panes of glass. It is used in conjunction with a washer and when the reflector gets any type of moisture on it we are plagued with false readings. Any wisdom as to whether I can use an ultrasonic or diffuse photoeye to detect glass?

Thanks

ArikBY · Jun 19, 2006

You can use Ultra Sonic sensor or install your photo eye sensor in a way that the moister would not effect the sensor.

If your pans are clear(transparent) diffuse might be a problem.

Only a test can tell if it good or not.

Lead Maintenance · Jun 19, 2006

Thanks for the reply Arik,

Unfortunately I cannot place the reflector in any other location that would not be affected by moisture so I have no other choice but to come up with a different type of sensor. I figured since the Ultrasonic might work by distance I could just detect when a pane of glass is present. This will give me other options for programming that are related to the project.

Thanks again.

CroCop · Jun 19, 2006

Make sure the Ultrasonic doesn't get moisture on the front of it. They don't respond well at all when covered..........

Lead Maintenance · Jun 19, 2006

The current system points straight down to the reflectors. The sensors themselves don't see moisture, just the reflectors. I don't really have any other way to look at the product but I'm sure there is something out there to do the job without the reflectors.

Thanks again,

Jeff

RheinhardtP · Jun 19, 2006

Hi Jeff

If you can describe your conditions a bit better i would use a diffused sensor type from Schneider, you can also set this one up to be reflective, very nice , i hav used them for ages and found no problems..

I'm at the point where i reffuse to use the reflective type, just double the problems with double theequipment

silva.foxx · Jun 19, 2006

Any chance of trying a capacitive type proxi?

What about having a draught of compressed air over the reflector to discourage moisture to settle?

Sergei Troizky · Jun 20, 2006

Put a blower nozzle and blow out the water before reading the sensor.

Lancie1 · Jun 20, 2006

Can you use a small fiber-optic diffuse photoswitch head, looking at the EDGE of the glass, instead of directly? The edge of glass is less transparent, and will reflect more.

Another possibility is to put a mirror beneath the glass, and look at the mirror with a thru-beam type of photoswitch. These have a light source and a light detector. Set your source to shine on the mirror at about a 60-degree angle, and your detector to look for the reflected beam. With no glasss, straight reflection. With glass, deflected distorted reflection.

RussB · Jun 20, 2006

Is this what you are doing?
http://www.bannerengineering.com/applications/?appID=90&action=app_detailhttp://www.bannerengineering.com/applications/?appID=255&action=app_detail
This may also work:
http://www.bannerengineering.com/whats_new/release.php?id=82

Diffuse Photoeye

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