It is understood that the surveying and mapping of commercial housing area is carried out in two stages. First of all, the surveying and mapping personnel measure the estimated area of the house according to the drawings and other materials; after the house is completed, the actual area should be measured. In the actual area measurement stage, the surveying and mapping personnel should conduct household measurement, and use advanced equipment such as laser rangefinders to measure the length, width, and high-end of the house. Buildings take area measurements. Laser sensor A sensor that uses laser technology to measure.

It consists of a laser, a laser detector and a measuring circuit. Laser sensor is a new type of measurement surface, its advantage is that it can achieve non-contact long-distance measurement, fast speed, high precision, large range, strong resistance to light and electrical disturbances, etc. The opening of the transit time laser distance sensor The laser is widely used in the detection field, with a very rich technical content, and its impact on social production and life is also very significant. Laser ranging is one of the earliest applications of lasers.

Laser ranging is because the laser has many advantages such as strong directionality, high brightness, and good monochromaticity. Using lasers to measure the distance between the earth and the moon is only 250m away. The distance between the earth and the moon is also measured with a laser, and the error is only 15cm. The basic principle of using the laser transmission time to measure the distance is to determine the policy distance by measuring the time required for the laser to reciprocate the policy.

Although the principle and structure of transit time laser ranging is simple, it was mainly used in military and scientific research in the past, but it is very rare in industrial automation. Because the price of laser ranging sensors is too high, generally in the thousands of dollars. Practically all industrial users are looking for a sensor that enables precise distance detection at longer distances. Because in many cases, the sensor of the short-range device is bound by the physical orientation and production environment, the current transmission time laser ranging sensor will solve the problem for engineers in such occasions. Operating principle When the transmission time laser sensor operates, the laser diode is first aligned with the policy emit laser pulses. After being reflected by the policy, the laser light is scattered in all directions.

Part of the scattered light returns to the sensor receiver, where it is picked up by the optical system and imaged onto the avalanche photodiode. An avalanche photodiode is an optical sensor with an internal amplification function, so it can detect extremely small light signals. The policy distance can be determined by recording and processing the time from the announcement of the light pulse to the time it was received. Transit time Laser sensors are necessary to measure transit time extremely accurately because the speed of light is so fast.