1、 The principle of triangulation distance measurement
Triangular distance measurement is a measurement method based on the geometric triangle theorem. It uses a laser beam to irradiate the measured object at a certain incident angle, and the laser reflects and scatters on the surface of the object. At another angle, the reflected laser is focused and imaged using a lens, and the spot is imaged on a position sensor (such as CCD). When the object being measured moves along the laser direction, the light spot on the position sensor will move, and the displacement size corresponds to the distance of the object being measured. Through algorithm design, the distance value between the measured object and the baseline can be calculated from the distance of the spot position. Due to the fact that the incident light and reflected light form a triangle, the calculation of the spot position uses the geometric triangle theorem, hence this measurement method is called laser triangulation.
2、 The advantages of triangulation distance measurement
Non contact measurement: Triangular distance measurement is a non-contact measurement method that can avoid deformation or wear of the measured object, and is suitable for measuring precision objects.
Fast measurement speed: Triangular ranging has a fast measurement speed and can complete a large number of measurement tasks in a short period of time.
Strong adaptability: Triangular ranging can be applied to measuring objects of different materials and shapes, including transparent, semi transparent, and opaque materials.
Low cost: Compared to other high-precision measurement methods, triangulation ranging has a lower cost and is easy to promote and apply.
3、 Disadvantages of Triangular Distance Measurement
Accuracy is limited: The accuracy of triangulation ranging is affected by various factors, such as the divergence angle of the laser beam, the resolution of the position sensor, and the surface characteristics of the measured object. Therefore, in some high-precision situations, triangulation ranging may not be able to meet the requirements.
Affected by environmental factors: The measurement results of triangulation distance measurement are easily affected by environmental factors, such as light interference, temperature changes, etc. These factors may lead to an increase in measurement error.
Difficulty in deployment: In plain or concealed areas, due to the influence of obstacles, the deployment of triangulation distance measurement may be difficult, increasing the difficulty and cost of measurement.
In summary, triangulation distance measurement has the advantages of non-contact measurement, fast measurement speed, strong adaptability, and low cost, but it also has disadvantages such as limited accuracy, environmental factors, and difficult deployment. In practical applications, it is necessary to choose appropriate measurement methods based on specific needs and conditions.