As a core equipment for neuroscience research, the stability of near-infrared brain imaging directly affects the accuracy of functional near-infrared spectroscopy (fNIRS) data acquisition. The following provides a detailed explanation of scientific maintenance plans from six dimensions to help improve equipment reliability and service life.
1、 Daily basic maintenance
1. Standardization of surface cleaning
-After the daily experiment, use an anti-static soft cloth dipped in a small amount of isopropanol to wipe the probe housing and the main panel, focusing on removing pollutants such as sweat and grease.
-Use a compressed air tank to blow and clean the heat dissipation pores every week to prevent dust accumulation from affecting the heat dissipation efficiency.
2. Cable Management Standards
-The fiber optic jumper adopts a spiral winding storage, with a bending radius of not less than 5cm; the USB data cable is labeled with the interface number to avoid poor contact caused by repeated plugging and unplugging.
-The head mounted device bracket adopts magnetic suction fixation to reduce the risk of mechanical wear.
2、 Special maintenance of optical system
1. Maintenance of light source module
-After the LED light source has been working for 100 hours, it is necessary to use a spectral radiometer to detect the output intensity. If the attenuation exceeds 15%, immediately replace the spare light bulb.
-Laser safety level verification: Check the integrity of the protective cover every month, and it is strictly prohibited to directly look at the undiminished laser beam.
2. Detector calibration
-Use a standard diffuse reflectance whiteboard for energy normalization calibration, perform weekly dark current correction, and eliminate ambient light interference.
-The filter group should be disassembled and cleaned quarterly, and the surface should be lightly wiped with anhydrous ethanol to avoid fingerprint oil stains affecting the transmittance.
3. Optical path alignment verification
-By observing the collimator spot position through the observation window, if the deviation exceeds 0.5mm, the 3D adjustment frame needs to be adjusted to ensure precise focusing of the optical path.
3、 Deep maintenance of head mounted equipment
1. Flexible bracket maintenance
-Remove the silicone pad every month and soak it in warm water and neutral detergent for cleaning. Do not use ultraviolet disinfection to prevent aging and brittleness.
-Elastic bandages are evaluated for their tensile performance every six months, and if the deformation exceeds 20% of the original length, they need to be replaced.
2. Sensor array inspection
-Detect the signal-to-noise ratio of each photodetector one by one, and for abnormal channels, solder joints need to be re soldered or damaged photosensitive components need to be replaced.
-When the skin material cracks, immediately stop using and contact the manufacturer for replacement to prevent skin irritation or signal leakage.
4、 Key points of environmental control
1. Temperature and humidity management
-The working environment temperature is controlled at (22 ± 2) ℃, and the humidity is maintained at 40% -60%, equipped with a constant temperature and humidity air conditioning system.
-Avoid direct sunlight during device operation, and install blackout curtains on windows to prevent infrared interference.
2. Electromagnetic shielding measures
-It is prohibited to place strong electromagnetic devices such as mobile phones and wireless routers within 1 meter around the host. If necessary, a Faraday cage shielding cover should be installed.
-The power line should be routed separately and kept away from electromagnetic interference sources such as large motors and transformers.
5、 Emergency Response Plan
1. Emergency power outage response: Immediately turn off the power switch of the equipment, let it stand for 10 minutes after the power is restored, and then restart to avoid sudden high-voltage impact on the circuit.
2. Liquid splashing treatment: If conductive liquids such as physiological saline seep into the equipment, quickly disconnect the power supply, dry it with absorbent paper, and place it in a ventilated place to air dry for 48 hours.
3. Software troubleshooting: In case of communication interruption, check the USB driver installation status, firewall settings, and firmware version compatibility in sequence.
By establishing a three in one maintenance system of "daily maintenance+regular calibration+environmental control", the equipment failure rate can be reduced by more than 60%. It is recommended to establish an annual maintenance calendar to control preventive maintenance costs within 8% -12% of the original equipment value, far below the economic losses caused by sudden repairs. Operators need to receive professional training, master basic fault diagnosis skills, and ensure that the equipment is always in the best working condition.