-
E-mail
info@campbellsci.com.cn
- Phone
-
Address
Room 1201, Building 60, Tianji Zhigu, Jinghai 3rd Road, Yizhuang, Daxing District, Beijing
Kangbao Zhixin Measurement Technology (Beijing) Co., Ltd
Briefly describe the diagnosis and solutions to common problems of LiDAR cloud height meters
Date: 2025-10-09Read: 20
Lidar cloud altimeter plays an important role in aviation meteorology, climate research, and environmental monitoring by emitting pulsed lasers and receiving atmospheric backscatter signals to accurately detect key parameters such as cloud height, vertical visibility, and aerosol distribution. Its operation relies on precise optical systems, high-sensitivity detectors, and complex algorithms, and is susceptible to environmental interference due to long-term outdoor exposure. Mastering the diagnosis and solutions to common problems of LiDAR cloud height meters is the key to ensuring their continuous and stable operation.
Problem 1: Weak signal or no echo
Check laser emission: Confirm whether the laser is working properly (observe the status indicator light). If there is no light output, check the power supply and trigger signal;
Light path pollution: Clean the emission window and receiving telescope lens, remove dust, water mist, bird droppings, or salt spray crystals;
Weather impact: Thick fog, heavy rain, or heavy snowfall can severely attenuate laser signals, which is a normal phenomenon. It will be restored after the weather improves;
Detector malfunction: Check the power supply and gain settings of the photomultiplier tube (PMT) or avalanche diode (APD).
Problem 2: Cloud height data jumps or frequent false alarms
Background light interference:
Strong direct sunlight or snow reflection may saturate the detector. Use a sun blind filter or adjust the elevation angle to avoid strong light areas;
When the moonlight is too strong at night, the detector gain can be reduced.
Improper signal processing parameters:
Check if the threshold of cloud detection algorithm (such as signal-to-noise ratio threshold) is too low, and adjust it appropriately to reduce noise triggering;
Confirm that the average time setting is reasonable (such as 30 seconds to 5 minutes) and smooth out instantaneous fluctuations.
Electromagnetic interference: Check equipment grounding and keep away from high-voltage lines or radio transmission sources.
Problem 3: The device cannot start or communication is interrupted
Power supply inspection: Confirm that the power supply voltage is stable (AC220V or DC24V) and the fuse is not blown;
Network connection: Check if the network cable, fiber optic cable, or wireless module is loose, restart the router or switch;
Software malfunction: Restart the control software or host, update the driver program.
Problem 4: Laser frequently triggers protection or lifespan alarm
High temperature: Check if the cooling fan is working properly, clean the dust accumulation in the ventilation opening, and ensure that the operating temperature is within the allowable range;
Drive abnormality: Laser drive circuit malfunction, requiring professional repair;
Expiration of lifespan: Record the number of laser pulses and prepare for replacement when approaching the rated lifespan (e.g. 10 cycles).
Question 5: The cloud base height remains consistently high or low
Calibration verification:
Compare using known altitude targets (such as buildings, kites, sounding balloons);
Check if the system time synchronization (GPS timing) is accurate, as time errors can cause altitude calculation deviations.
Refractive index correction: Under harsh temperature and humidity conditions, changes in atmospheric refractive index affect ranging accuracy, and meteorological correction algorithms are used.