New arrival – 1535nm Erbium laser rangefinder module

01 Introduction 

In recent years, with the emergence of unmanned combat platforms, drones and portable equipment for individual soldiers, miniaturized, handheld long-range laser rangefinders have shown broad application prospects. Erbium glass laser ranging technology with a wavelength of 1535nm is becoming more and more mature. It has the advantages of eye safety, strong ability to penetrate smoke, and long range, and is the key direction of the development of laser ranging technology.

02 Product Introduction 

The LSP-LRS-0310 F-04 laser rangefinder is a laser rangefinder developed based on the 1535nm Er glass laser independently developed by Lumispot . It adopts the innovative single-pulse time-of-flight (TOF) ranging method , and its ranging performance is excellent for different types of targets – the ranging distance for buildings can easily reach 5 kilometers, and even for fast-moving cars, it can achieve a stable ranging of 3.5 kilometers. In application scenarios such as personnel monitoring, the ranging distance for people is more than 2 kilometers, ensuring the accuracy and real-time nature of the data. The LSP-LRS-0310F-04 laser rangefinder supports communication with the host computer through the RS422 serial port (TTL serial port customization service is also provided), making data transmission more convenient and efficient.

Figure 1 LSP-LRS-0310 F-04 laser rangefinder product diagram and one-yuan coin size comparison

03 Product Features 

* Beam expansion integrated design: efficient integration and enhanced environmental adaptability

The integrated beam expansion design ensures precise coordination and efficient collaboration between the components. The LD pump source provides stable and efficient energy input for the laser medium, the fast axis collimator and focusing mirror accurately control the beam shape, the gain module further amplifies the laser energy, and the beam expander effectively expands the beam diameter, reduces the beam divergence angle, and improves the beam’s directivity and transmission distance. The optical sampling module monitors the laser performance in real time to ensure stable and reliable output. At the same time, the sealed design is environmentally friendly, extends the service life of the laser, and reduces maintenance costs.

Figure 2 Actual picture of erbium glass laser

* Segment switching distance measurement mode: precise measurement to improve distance measurement accuracy

The segmented switching ranging method takes precise measurement as its core. By optimizing the optical path design and advanced signal processing algorithms, combined with the high energy output and long pulse characteristics of the laser, it can successfully penetrate atmospheric interference and ensure the stability and accuracy of the measurement results. This technology uses a high repetition frequency ranging strategy to continuously emit multiple laser pulses and accumulate and process echo signals, effectively suppressing noise and interference, significantly improving the signal-to-noise ratio, and achieving accurate measurement of target distance. Even in complex environments or in the face of minor changes, segmented switching ranging methods can still ensure the accuracy and stability of measurement results, becoming an important technical means to improve ranging accuracy.

*Double threshold scheme compensates ranging accuracy: double calibration, beyond the limit accuracy

The core of the dual-threshold scheme lies in its dual calibration mechanism. The system first sets two different signal thresholds to capture two critical time points of the target echo signal. These two time points are slightly different due to different thresholds, but it is this difference that becomes the key to compensating errors. Through high-precision time measurement and calculation, the system can accurately calculate the time difference between these two points in time, and finely calibrate the original ranging results accordingly, thus significantly improving the ranging accuracy.

Figure 3 Schematic diagram of dual threshold algorithm compensation ranging accuracy

* Low power consumption design: high efficiency, energy saving, optimized performance

Through in-depth optimization of circuit modules such as the main control board and driver board, we have adopted advanced low-power chips and efficient power management strategies to ensure that in standby mode, the system power consumption is strictly controlled below 0.24W, which is a significant reduction compared to traditional designs. At a ranging frequency of 1Hz, the overall power consumption is also kept within 0.76W, demonstrating excellent energy efficiency. In the peak working state, although the power consumption will increase, it is still effectively controlled within 3W, ensuring the stable operation of the equipment under high performance requirements while taking into account energy saving goals.

* Extreme working capability: excellent heat dissipation, ensuring stable and efficient operation

In order to cope with the high temperature challenge, the LSP-LRS-0310F-04 laser rangefinder adopts an advanced heat dissipation system. By optimizing the internal heat conduction path, increasing the heat dissipation area and using high-efficiency heat dissipation materials, the product can quickly dissipate the internal heat generated, ensuring that the core components can maintain a suitable operating temperature under long-term high-load operation. This excellent heat dissipation capability not only extends the service life of the product, but also ensures the stability and consistency of the ranging performance.

* Portability and durability: miniaturized design, excellent performance guaranteed

The LSP-LRS-0310F-04 laser rangefinder is characterized by its amazing small size (only 33 grams) and light weight, while taking into account the excellent quality of stable performance, high impact resistance and first-level eye safety, showing a perfect balance between portability and durability. The design of this product fully reflects the deep understanding of user needs and the high degree of integration of technological innovation, becoming a focus of attention in the market.

04 Application Scenario 

It is used in many special fields such as aiming and ranging, photoelectric positioning, drones, unmanned vehicles, robotics, intelligent transportation systems, intelligent manufacturing, intelligent logistics, safe production, and intelligent security.

05 Main technical indicators 

The basic parameters are as follows:

Product appearance dimensions:

Figure 4 LSP-LRS-0310 F-04 Laser Rangefinder Product Dimensions

06 Guidelines 

* The laser emitted by this ranging module is 1535nm, which is safe for human eyes. Although it is a safe wavelength for human eyes, it is recommended not to look directly at the laser;

* When adjusting the parallelism of the three optical axes, be sure to block the receiving lens, otherwise the detector will be permanently damaged due to excessive echo;

* This ranging module is not airtight. Make sure the relative humidity of the environment is less than 80% and keep the environment clean to avoid damaging the laser.

* The range of the ranging module is related to the atmospheric visibility and the nature of the target. The range will be reduced in fog, rain and sandstorm conditions. Targets such as green leaves, white walls, and exposed limestone have good reflectivity and can increase the range. In addition, when the target's inclination angle to the laser beam increases, the range will be reduced;

* It is strictly forbidden to shoot laser at strong reflective targets such as glass and white walls within 5 meters, so as to avoid the echo being too strong and causing damage to the APD detector;

* It is strictly forbidden to plug or unplug the cable when the power is on;

* Make sure the power polarity is connected correctly, otherwise it will cause permanent damage to the device.