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Laser displacement sensor

A displacement sensor is used so as to maintain and improve productivity and quality by helping an apparatus to move on a production line. Optical sensors which measure a displacement of a sample based on an optical interference method are most widely used because the wavelength of a light beam can be used as a reference in these sensors. Displacement sensors for optically measuring linear displacements comprises a housing, a spindle provided therein for displacement in the axial direction, a probe provided at one end of the spindle, and a scale provided at the other end thereof and having an optical lattice extendinc in the direction of displacement. The housing furtheI accommodates a light source for projecting light onto the scale and a photoelectric transducer for converting light from the scale to an electric signal. Conventional laser displacement measurement systems compare the phase shift of a modulated reflected laser beam, with respect to the modulated transmitted laser beam, to determine the displacement or range of a target. Such systems incorporate a radiation source which transmits radiation towards a target, where the radiation is reflected off the target and detected by a radiation detector. The transmitted signal is then compared with the received signal to determine the amount of phase shift between the two signals.

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