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Laser Diodes for Distance Measurement

This is a simple example of the measurement principle and features of a ranging device using an LD. Light emitted from the LD bounces off an object and is detected by the light receiving block (PD) in the device, which determines the distance by calculating the time taken from emission to reception. Laser diodes are commonly used in rangefinders since the coherency of light emitted from the light source must be high to ensure a straight path over a long distance. The smaller light source compared to LEDs makes it easier to focus the light.

PTM Published on: 2021-11-04