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AV02-2132EN - March 21, 2011

The distance between the bottom of the window and the sensor top–the air gap– should be as close as possible and not

more than 0.2 mm. For optimum performance, windows thickness should be limited to not more than 0.8mm.

Window and Light Guide Recommendations

Transparent window with IR coating (IR pass of around 90% and minimum 30% visible pass) is recommended in order to

pass both visible and infrared light. The material of the window is recommended to be polycarbonate. The surface finish

of the plastic should be smooth, without any texture.

The recommended plastic material for use as a window is available from Bayer AG and Bayer Antwerp N. V. (Europe),

Bayer Corp.(USA) and Bayer Polymers Co., Ltd. (Thailand), as shown in Table below.

Recommended Plastic Materials

Material number

Visible light transmission*

Refractive index

Makrolon LQ2647

87%

1.587

Makrolon LQ3147

87%

1.587

Makrolon LQ3187

85%

1.587

* Transmittance of visible light will reduce if plastic window is coated with IR ink

To ensure that the performance of the APDS-9800 will not be affected by improper window design, there are some

constraints on the dimensions and design of the window so that the maximum size of the window, which is placed in

front of the photo light sensor, will not affect the angular response of the APDS-9800. This maximum dimension that is

recommended will ensure an acceptable light reception cone.

Windows thickness

Air gap

Plastic Window

IR absorbing area

IR pass area

Filter

APDS-9800

Side view of IR pass areas for window design

IR pass areas

1.2 mm

3 mm

0.7 mm

0.7 mm

Top view of IR pass areas for window design