The following is a professional maintenance guide for AFM Raman combination systems, covering core component maintenance, environmental control, and long-term stability assurance measures:
1、 Refined maintenance of core components
Scanner maintenance
Anti vibration protection: Due to the XY direction drive resolution of 0.01 nm and the Z direction resolution of 0.003 nm, an active damping platform is required to isolate low-frequency vibrations.
Piezoelectric ceramic maintenance: When not in use for a long time, power on once a month to prevent passivation of piezoelectric materials; Avoid force impact beyond the range.
Optical System Management
Laser path cleaning: Use a dust-free cotton swab dipped in high-purity ethanol to wipe the spectroscope and reflector every quarter to eliminate spot distortion caused by dust.
Objective lens condition monitoring: If the image is found to be partially blurred, check whether there is condensed water vapor or pollutant adhesion on the surface of the lens.
2、 Construction of Environmental Control System
Temperature and humidity closed-loop control
The temperature fluctuation in the laboratory must be controlled within ± 0.5 ℃, and it is recommended to configure a dual compressor unit air conditioning system. Maintaining a relative humidity of 45% to 60% RH can easily cause condensation on the scanning head if it is too high.
Electromagnetic shielding enhancement
Adopting a double-layer Faraday cage structure for grounding to isolate external RF interference. Install a π - type LC filter on the power cable to reduce the risk of noise coupling.
Cleanliness classification control
Establish a buffer room and maintain a cleanliness level of 10000, with operators wearing anti-static clothing and gloves for operation. Use a particle counter to detect the concentration of suspended particles ≥ 0.5 μ m in the box every week.
3、 Key points for implementing standardized operating procedures (SOP)
Boot sequence specification
Follow the sequence of "stabilized power supply → controller → computer host" to start, and preheat for no less than 30 minutes to stabilize the thermal drift.
Probe lifecycle management
Select standard probes that are suitable for the curvature radius of the needle tip according to experimental requirements; Perform resonance frequency calibration procedure after installing the new needle; Discarded needles should be stored in dedicated recycling containers to avoid cross contamination.
The implementation of the above systematic maintenance strategy can significantly improve the operational reliability and data collection repeatability of the AFM Raman combined system. It is recommended to establish a complete device logging system, continuously track the changing trends of various performance indicators, and achieve preventive maintenance goals.