Contact image sensor beats speed record
The record speed of 21 metres per second (or 1270 metres per minute) is achieved with a little trick: Unlike most available contact image sensors, the new device from Tichawa features two sensor lines instead of one.
CIS systems consist of a reading line, an optical system and a light source. Since they are designed for a reproduction ratio of 1:1 their dimensions match the ones of the original presentation. During operation, they have a distance of 8 to 14 mm of the object to be scanned. Instead of a single lens, the cameras are equipped with an array of gradient-index lenses. Each lens maps a small section of the object. Through purposeful, specific overlap of these image segments, the camera creates a sharp, precise image. The task of converting the light intensity into an electric signal is taken by CCD or CMOS sensors.
With regards to the essential features like dark noise, peak response nonuniformity and dynamic range, CIS are comparable to conventional line scan cameras. However they offer significant better spatial resolution and luminous efficacy. CIS systems are made with dimensions of up to 4.1 metres. Thanks to their compactness and low operating distance they can be designed into system which offer not enough space for conventional line scan cameras.
Tichawa continues to leverage its low-distance image sensor technology to further develop its contact image sensors and offers a broad range of industrial image processing systems for a variety of industries. Since the company’s CIS are equipped with LEDs of different colours, the spectral gap can be avoided. This gap is a frequent but undesirable effect with line scan cameras. Measurements with the Munsell colour card prove that CIS achieve much higher colour exactness than conventional tri-linear line scan cameras.
Tichawa will showcase its latest CIS at the Vision 2014, a trade fair for industrial image processing in Stuttgart from November 4 to 6.
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