[Elphel-support] The sensivities of the sensors in the near infrared range

[Andrey Filippov]

Petri,

It is very difficult to reduce sensitivity of a silicon sensor in near IR
range - this is why all color cameras have IR cutoff filters - the mosaic
color filters only cut some of the visible range, but all allow near IR to
go through. Such cutoff filters are used in many monochrome applications
where high resolution is more important than using all the light that
reaches the camera - requirement to cover wider spectral range makes it more
difficult for the lens to provide sharp focus.

Aptina MT9P001/031 imagers have good sensitivity for this size of the
sensors, and while we do not have the IR sensitivity numbers, these sensors
(like other silicon devices) have higher sensitivity in near IR than in
visible range. So are you sure that you do not have a filter - in the camera
or inside the lens? You may test if the camera is IR-sensitive using a TV
remote control - try it with the lens and with the lens removed (point
directly to the camera sensor with lights turned off).

Andrey

2011/5/23 Petri Välisuo <petri.valisuo at uwasa.fi>

> Hello,
>
> Does anyone know about the sensivitities of the sensors used in the
> Elphel models in near infrared range. We would need more sensitivity
> around 800 nm range than provided by Aptina MT9P001. We already
> have a camera version without additional NIR filter installed, but the
> sensitivity of the sensor itself may be poor in NIR. We don't know that
> really, since the sensitivity is not mentioned in the specifications by
> Aptina.
>
> Is there any other sensors available for 353 camera model, which would
> have better sensitivity in NIR. How about the Kodak CCD sensors?
>
> At least Aptina MT9V032 CMOS sensor is about as sensitive in NIR than
> in visible range, but it has rather poor spatial resolution.
>
> Best regards
>
>   -Petri Välisuo
>
>
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