Development of Key Parameter Metrology and Detection Equipment for Q-switched Nd:YAG Laser Therapy Apparatus
WU Fu-bao1,2,HU Zhi-xiong2,DUAN Liang-cheng2,ZHONG Kai1,XU Bao-zhong1, LIU Wen-li2,YAO Jian-quan1
1.College of Precision Instrument and Optoelectronics Engineering,Tianjin University, Tianjin 300072, China
2.Center for Medical Metrology, National Institute of Metrology, Beijing 100029, China
Abstract：In view of the difficulty in traceability of the key parameters of pulsed laser therapy apparatus, a metrology and detection equipment for the key parameters of Q-switched Nd:YAG laser therapy apparatus based on LabVIEW and USB bus technology was designed and developed. The equipment can measure and detect the key parameters of the treatment laser and the aiming laser and generate the detection report automatically. The main function modules of the system are:pulse width, energy, repetition frequency, spot size and beam dispersion angle, wavelength and aiming laser power measurement. In the spot measurement module, the feedback mechanism into the traditional "knife-edge method" was introduced and the automatic measurement was realized, which can adapt to the laser of different pulse frequencies. Furthermore, the traceability method was further studied, and the uncertainty of spot size measurement reached 3.2%. The uncertainty of other parameters of the laser therapy apparatus measurement and detection equipment was also analyzed, including laser wavelength, pulse width, energy, repetition frequency, and aiming laser power, the uncertainties are 0.6 nm, 4.0%, 3.2%, 0.12% and 3.4%, respectively.
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2023, Vol. 44 
