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The infrared laser rangefinder utilizes the principle of non diffusion during infrared propagation, and measures and calculates distance based on the time it takes for the infrared to travel from the rangefinder to encounter obstacles and reflect back, as well as the speed of infrared propagation. Infrared laser rangefinders are generally divided into two categories: handheld and telescope type. The measurement distance of a handheld infrared laser rangefinder is generally within 200 meters, with an accuracy of about 2mm. In addition to measuring distance, it can also measure area and volume of objects. The measurement distance of telescope style is generally around 600-3000 meters, which measures a relatively long distance but has relatively low accuracy, usually around 1 meter, and is used for long-distance field measurements.

When using infrared laser sensors for distance measurement, it is sometimes necessary to measure the azimuth angle of the rangefinder. In this case, it is necessary to install a three-dimensional electronic compass on the rangefinder to meet the measurement requirements. Due to the fact that infrared laser rangefinders measure the distance between the object being measured and the instrument, direct measurement is not always possible in actual measurements. In most cases, due to objective limitations, only distance and angle measurements related to this can be used to calculate the distance using geometric relationships. Even in situations where direct measurement is possible, if it is necessary to detect the orientation of the object being measured or to detect the orientation relative to the measurer, it is necessary to first measure the geographical orientation of the measurer using an electronic compass, and then obtain the orientation of the object being measured based on the changes in the azimuth angle of the rangefinder during the measurement.

The SEC series 3D electronic compass developed by Huilian Technology is a low-power, high-performance 3D electronic compass module with tilt compensation. The compass adopts advanced algorithms for soft and hard magnetic correction, providing accurate azimuth information. The SEC series electronic compass integrates three-axis magnetic sensors and three-axis tilt sensors together. Due to its compact size, it is very suitable for systems with high space requirements. These advantages make the SEC series 3D electronic compass from Huilian Technology the choice for many high-precision and high-performance applications.