OMRON Displacement Sensors

Product Details

What Is a Displacement Sensor?A Displacement Sensor is a device that measures the distance between the sensor and an object by detecting the amount of displacement through a variety of elements and converting it into a distance. Depending on what element is used, there are several types of sensors, such as optical displacement sensors, linear proximity sensors, and ultrasonic displacement sensors.What Is a Measurement Sensor?A Measurement Sensor is a device that measures the dimensions of an object by converting changes in amount of light into electrical signals when the object interrupts a wide laser beam.Features1. A physical quantity of an object can be measured.A Displacement Sensor measures and detects changes (displacement) in a physical quantity.The Sensor can measure the height, width, and thickness of an object by determining the amount of displacement of that object. A Measurement Sensor measures the position and dimensions of an object.2. Physical quantity output is also possible in addition to ON/OFF signal output.Analog output of physical quantities (current output or voltage output) can also be performed (excluding some models). Some models also support digital (serial) communications.Displacement Sensors1. Optical Displacement SensorsTriangulation Measurement MethodThese sensors use a triangulation measurement system. Some sensors employ a PSD, and others employ a CMOS (CCD) as the light receiving element.• PSD MethodLight from the light source is condensed by the lens and directed onto the object.Light reflected from the object is condensed onto a one- dimensional position sensing device (PSD)* by the receiving lens. If the position of the object (the distance to the measuring device) changes, the image formation positions on the PSD will differ and the balance of the two PSD outputs will change.If the two outputs are A and B, calculate A/(A + B) and use appropriate values for the span coefficient "k" and the offset "C" as shown below.• CMOS (CCD) MethodLight sourceEmitter lens Emitter axisObjectLight-receiving elementReceiver lensReceiver axisCompared with a sensor that employs the PSD method, a sensor that employs a CMOS (CCD) as the light receiving element provides a more accurate measurement of displacement without being affected by surface color and texture of objects.The sensor detects the amounts of light on individual pixels in the CMOS (CCD) and converts them into a distance when a spot beam that reflects off of the surface of the object is projected onto the light receiving element.