What is the working principle of 905nm laser rangefinder?
Publish Time: 2025-03-25
As a high-precision measurement tool, laser rangefinder is widely used in various fields. Among them, 905nm laser rangefinder has become a popular choice in the market due to its unique performance and advantages.
The core of 905nm laser rangefinder lies in the laser pulse flight time method it adopts. This method is based on a basic physical principle: the propagation speed of light in a vacuum is a constant value, that is, the speed of light. By measuring the time required for the laser pulse to be reflected back by the target, we can calculate the distance between the target and us according to the formula "distance = speed of light × time difference / 2". The "time difference" here refers to the difference between the emission time of the laser pulse and the echo reception time.
In 905nm laser rangefinder, the laser transmitter is responsible for emitting laser pulses of a specific wavelength to the target, and the wavelength here is 905 nanometers. The reason for choosing 905nm as the working wavelength is mainly because the laser of this wavelength has good penetration and reflectivity, and can work stably in various environments. At the same time, the 905nm laser is relatively less harmful to the human eye, which increases the safety of use.
When the laser pulse encounters the target object, it is reflected back to form an echo signal. This echo signal is captured by the receiving system of the laser rangefinder. The receiving system usually includes a photodetector that is capable of converting the received optical signal into an electrical signal. This electrical signal is then amplified and processed for further calculation and analysis.
In the signal processing stage, the 905nm laser rangefinder uses a high-precision timing module to accurately record the emission time of the laser pulse and the echo reception time. The difference between these two time points is the time difference we need. Through this time difference and the known speed of light, we can calculate the distance between the target and us.
It is worth noting that the measurement accuracy of the 905nm laser rangefinder is affected by many factors. For example, the width of the laser pulse, the sensitivity of the receiving system, the reflection characteristics of the target, and environmental factors (such as atmospheric attenuation, scattering, etc.) may all affect the measurement results. Therefore, in practical applications, we need to calibrate and adjust the rangefinder according to the specific situation to ensure the accuracy of the measurement results.
In addition, the 905nm laser rangefinder has many other advantages. For example, it has a wide measurement range and is suitable for measuring long-distance targets; it has a fast measurement speed and can complete multiple measurements in a short time; it has strong environmental adaptability and is not affected by weather and lighting conditions. These advantages make the 905nm laser rangefinder have broad application prospects in various fields.
In summary, the working principle of the 905nm laser rangefinder is based on the laser pulse flight time method, which calculates the target distance by measuring the difference between the emission time of the laser pulse and the echo reception time. This method has the advantages of high precision, fast speed, and stability, making the 905nm laser rangefinder an indispensable measurement tool in many fields.
