Filter types

Every uEye camera has a filter glass in the front flange to prevent the entry of dust particles. Color cameras by default use an IR cut filter, which is required to ensure correct color rendering. The default filter glass in monochrome cameras has no filter effect. Every camera model is available with different filter variants such as daylight cut filters (type DL). The filter type is given at the end of the uEye model name.

The following table shows an overview of the different optical filters used in the uEye cameras:

Filter type	Name	Refractive index (nFilter)	Glass type	Thickness (f)	Cut-off frequency	Non-reflective
IR cut filter (old)	BG	1.53	BG40	1 mm	650 nm	-
IRcut filter (new)	HQ	1.53	D263	1 mm	650 nm	On one side
Daylight cut filter	DL	1.53	RG665	1 mm	695 nm	-
Glass	GL	1.53	D263	1 mm	380 nm	On both sides

Hinweis

All uEye sensors have a D263 type cover glass. This glass is opaque to wavelengths below 330 nm.

Hinweis

You can tell the filter type from the outside by its coloration:

•Reddish glass: HQ filter

•Bluish glass: BG filter

•Opaque glass: DL filter

•Plain glass: GL filter

Hinweis

New uEye color cameras use an IR cut filter of the type HQ by default. This filter offers an improved accuracy of the infrared content. HQ filters achieve a higher image brightness and better color rendering compared with the BG filter.

uEye drivers of version V3.24 and higher determine automatically which the IR filter is used in a camera. The corresponding color correction is selected automatically.

Infrared cut filter (type BG)

Fig. 346: BG filter

Infrared cut filter (type HQ)

Fig. 347: HQ filter

Daylight cut filter (type DL)

Fig. 348: DL cut filter

Plain glass filter (type GL)

Fig. 349: Glass filter

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Filter types