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        SecurityWorldMarket

        18/06/2020

        Perimeter surveillance – Part 4 of 5

        中乙积分

        中乙积分Passenger recognition test with different wavelength illumination on a tinted rear window – 730nm provides the best result.

        Passenger recognition test with different wavelength illumination on a tinted rear window – 730nm provides the best result.

        An increasing number of transport applications around the world are trying to identify drivers and passengers inside a vehicle. In this article, Callum Ryder, Marketing Manager at Raytec explore the difficulties of seeing through the windscreen, and discuss how different wavelengths of light could help to overcome the issues.

        Modern windscreens block out certain wavelengths of light to protect the occupants of the vehicle from ultraviolet (UV) rays and to keep the cabin cool by blocking infrared (IR). However, the filters do not block all IR rays which means IR can still be used for these applications.

        One option is to use more power, but this can be expensive and uneconomical.

        中乙积分

        Ideally, the quality of images produced using 730nm could be achieved using an illuminator which gives off no visible light. In reality, as we move further down the spectrum, more light becomes visible to the driver.

        Covert IR (940nm) gives off no visible light, but the images are poor. With standard IR (850nm) the quality of the images are good, but there is a visible red glow. Lastly, 730nm achieves excellent quality images with detail of the individual in the car, but there is a very obvious red glow.

        The driver recognition test revealed that three out of four wavelength examples de-livered fairly good level of details inside the vehicle. However, the Covert IR (940nm) delivered significantly worse images.
        The driver recognition test revealed that three out of four wavelength examples de-livered fairly good level of details inside the vehicle. However, the Covert IR (940nm) delivered significantly worse images.

        中乙积分

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