Drive STINGRAY Operator's Manual download pdf (Page 31)

Servicing Your Coherent StingRay Laser

3 - 3

• Verify that the optics are not contaminated. If the optics are

contaminated, it is best to try and remove visible contamina-

tion by blowing dry air across the surface. Make sure the air

product is oil- and moisture-free. If this technique fails to

remove the contaminants, gently wipe the glass surface with a

piece of slightly damp lens tissue.

Cleaning

Diffraction

Gratings

All lasers projecting a pattern other than a dot, a single line, or a

crosshair, have a diffraction grating. If your laser has a diffraction

grating, only use a sterile jet of nitrogen or air to clean the surface of

the grating. Using other products will cause damage.

Operating Hints

A broad line or band of light can be projected (line-generating lasers

only) by slightly de-focusing the laser source. Follow the instruc-

tions under “Focusing Lasers” (p. 3-2), but try to enlarge the image

spot at your desired target distance. A larger dot area at the focus

distance creates a dimmer pattern. Try to determine the best focused

spot size for your band of light application.

The angle of illumination and detection can greatly enhance a char-

acteristic or defect you may be trying to capture. If physical param-

eters allow, optimize the camera or sensor position relative to the

laser position. See the examples in the following figure.

(a) A laser at a steep angle can be useful for edge, trim, and insertion

detection.

Laser

Sheet-of-light

CCD

camera

Computer

Laser

Workpiece

(a) (b)

CCD

camera

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Drive STINGRAY Operator's Manual Page 31