Laser triangulation sensor for displacement measurement

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The laser displacement transducer measure the displacement by two methods (1)triangulation 

(2)time to flight (TOF) 


Triangulation

 displacement transducer



Construction

Basically it consists of semiconductor laser as a light  source and detector(light sensitive receiving element).One driver circuit is connected with the light source or laser source and signal amplifier is connected with the detector.

The optical lens is used to focus a light on a detector surface.

Receiving element located an angle that varies from 45 to 65 degree at the centre of the measurement range. maybe a position sensitive device o(PSD) or a charge coupled device(CCD) is used as a receiving element.

Working

if the target change its position from the reference point the position of the projected l(transmitted laser light)on the detector change as well.

By measuring the position of receiving light. We can measure the distance or position of the target object.


Sensors can be divided into two categories based upon their performance and intended use. High-resolution lasers are typically used in displacement and position monitoring applications where high accuracy, stability and low temperature drift are required. Quite frequently these laser sensors are used in process monitoring and closed-loop feedback control systems. Proximity type laser triangulation sensors are much less expensive and are typically used to detect the presence of a part, or used in counting applications

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