1、 Daily maintenance and operation standards

1. Pre use inspection

• Optical window cleaning
  • riskDust, oil stains, or fingerprints can reduce light transmittance, leading to measurement errors or signal loss.
  • operation：
    • Dip a dust-free cloth in isopropanol (concentration ≥ 99%) and gently wipe to avoid scratching the surface.
    • Do not use ammonia containing cleaning agents or rough materials (such as paper towels).
  • StandardAfter cleaning, the transmittance should be ≥ 95% (which can be detected by a spectrophotometer).
• Power and connection inspection
  • riskLoose wiring or voltage fluctuations may damage the laser diode or APD (avalanche photodiode).
  • operation：
    • Confirm that the power supply voltage is stable (within ± 5%), and use an oscilloscope to monitor ripple (should be<50mV).
    • Check the pin oxidation of communication interfaces (such as UART, I ² C), and clean them with an alcohol swab if necessary.

2. Precautions during use

• avoidharshenvironment
  • temperatureThe working temperature range is usually -20 ℃~60 ℃. If it exceeds the range, a temperature control device (such as a semiconductor refrigeration chip) needs to be installed.
  • humidityWhen the humidity is greater than 80%, it needs to be sealed to prevent moisture or equipped with a desiccant pack (it is recommended to replace it every 3 months).
  • caseA certain outdoor rangefinder had a short circuit on the circuit board due to unsealed and humid conditions, resulting in a repair cost of 40% of the original equipment price.
• Prevent mechanical impact
  • riskVibration (>10g) may cause optical axis deviation or internal component loosening.
  • operation：
    • Use shock-absorbing pads (such as silicone pads) or rigid brackets to fix during installation.
    • Add foam protective layer during transportation to avoid falling or collision.

2、 Regular maintenance and calibration

1. Cleaning and inspection cycle

2. Calibration process

• Distance calibration
  • tool: Standard distance board
  • Steps：
    1. Measure the standard distance in a windless and constant temperature environment, and record the deviation between the actual value and the displayed value.
    2. Adjust calibration coefficients through software or registers (such as linear compensation formula:$D^{\text{Calibration}}=D^{\text{Original}}\times (1+k\cdot \Delta T)$Among them$k$For temperature coefficient).
  • StandardAfter calibration, the error should be ≤± 1mm (short distance) or ≤± 0.1% (long distance).
• Optical axis calibration
  • SceneThe optical axis of the module is offset after being impacted or used for a long time.
  • method：
    • Use a laser interferometer or parallel light tube to detect the position of the light spot and adjust the module angle (such as through a six axis adjustment table).
    • Objective: The deviation between the light spot and the reference point is ≤ 0.1 ° (corresponding to a deviation of about 17mm at a distance of 10m).

3、 Troubleshooting and Repair

1. Common faults and their solutions

2. Spare parts management

• Key spare parts: Laser diode APD、 Narrowband filter, power management chip.
• Storage conditionsSpare parts should be sealed and moisture-proof (humidity<30%), and laser diodes should be stored away from light.
• Lifecycle ManagementRecord the usage time of the module. The lifespan of the laser diode is usually 10000-50000 hours, and it should be replaced in advance when it approaches its lifespan.

4、 Long term storage specifications

1. Environmental Requirements
   • Temperature: 15 ℃~25 ℃, humidity: 30%~50%.
   • Avoid direct sunlight or strong magnetic field interference.
2. Packaging Method
   • Wrap the module in an anti-static bag (ESD shielding) with a built-in desiccant package.
   • Store in a shock resistant box to avoid stacking and heavy pressure.
3. Regularly power on
   • Power on once every 3 months (for 1 hour) to prevent capacitor aging or component moisture.
   • Test basic functions such as self check program and distance measurement after power on.