Model of Trough-Beam Laser Sensor for Determining the Real Position and Real Response Time
In almost all industries the use of non-contact sensors to detect objects and their position has become necessary. The laser through-beam sensors is resistant to electromagnetic interference, inexpensive and relatively accurate. The only parameters of trough-beam laser sensor provided by the manufacturer to estimate the object position measurement error are maximal response time and laser beam spot dimension. With such data, the device allows for order of accuracy of 10−3 m, which is not sufficient for precision machines. With that in mind, this paper presents a model of laser through beam sensor using a transistor hybrid model developed to improve location detection accuracy. An object in motion was detected in the experiment at the velocity ranging from 0.5 to 10 m/s. The results of the experiment showed good compatibility of the experimental and model output characteristics. The actual object location was determined at the accuracy of 2.5 ∙ 10−5 m (0.5 m/s) to 2.6 ∙ 10−4 m (10 m/s).
KeywordsHybrid transistor equivalent circuit Object detection Convolution integral
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