A single-point laser distance sensor is a device that uses laser technology to measure distances. Based on the advantages of high directivity, high monochromacy and high power of the laser, it transmits a laser pulse to the target and measures its round-trip time, and then multiplies it by the speed of light to obtain the target distance.
The sensor works similarly to radio radar, but uses lasers instead of radio waves. It first emits laser pulses from a laser diode, which are reflected by the target and partially the scattered light is returned to the sensor's receiver. The optical system in the receiver focuses this scattered light onto an avalanche photodiode, which is capable of detecting extremely weak light signals.
Next, the sensor records and processes the time elapsed from the time the light pulse is emitted to the time it is returned to be received. Since the speed of light is very fast (about 3x10 8 ms), highly accurate distance measurement requires extremely precise determination of the transmission time. To achieve this, laser distance sensors typically use a phase-based ranging method to determine the distance by measuring the phase difference of the modulated light at a distance of 2d.
Single-point laser distance sensors have the advantages of high measurement accuracy, large dynamic range, and are not affected by object vibration. However, its measurement process can be affected by other stray light. In addition, due to the nature of lasers, such sensors are often only suitable for measuring single-point distances and are not suitable for measuring distances over large areas or complex shapes.
In general, a single-point laser ranging sensor is a device that uses laser technology to achieve high-precision distance measurement, and is widely used in various scenarios that require accurate distance measurement, such as industrial automation, robot navigation, unmanned driving, and other fields.