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What points are important when installing a cover (filter) on the front of the sensor?

ID:
930
Issued:
Dec 28th, 2009
Updated:
May 17th, 2013

What points are important when installing a cover (filter) on the front of the sensor?

ANSWER

Required cover (front filter) specifications

Use a cover that transmits infrared light (wavelength: 900 nm).
Material: Acrylic, glass, or similar material
Surface condition: To prevent light dispersion, the surface roughness should be 1μm R-Max (ground glass is not acceptable)
Color: As long as the material optically transmits infrared light (wavelength: 900 nm), any visible color is acceptable. (You must be able to see through the plate.)
Thickness: Use a plate with a maximum thickness of 2 mm.
(If the cover is too thick, dirt on the cover may accidentally trigger detection.)

How to install the cover
Install the cover so that it is parallel to the front face of the sensor.

Covers of non-uniform thickness
As shown below, the detection distance can be lengthened by placing a cover or filter of non-uniform thickness in front of the sensor to produce a prism effect.

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