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Klaus Oberhauser, Alexander Nemecek, Horst Zimmermann

Integrated Correlation Receivers for Runtime Based Optical Distance Measurement

The shape of diffuse reflecting objects can be determined very fast by measuring the time of flight (TOF) of light by means of integrated optical distance measurement sensors. Typical fields of application are security applications in cars. Short run-time (ns) and low optical power received (nW) due to eye safety conditions pose a challenge for the receiver chip. The newly developed sensor concepts, based on PIN-photodiodes featuring a high responsivity (R=0.36A/W @ 660nm) and high bandwidth (f_3dB=1.35GHz) can fulfil these demands. Based on two sensor concepts different operating principles, internal and external correlation, will be shown. The laboratory setup consists of a modulated light source (laser), optics, the sensor IC, a control logic and measurement devices. With averaging an accuracy of better than 1% achieved. The sensors were manufactured in a modified 0.6μm BiCMOS process.

tm – Technisches Messen, Oldenbourg Wissenschaftsverlag

Print ISSN: 0171-8096
Volume: 72, 04/2005
Pages: 230 - 235

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