Q开关Nd:YAG激光治疗机关键参数计量检测装置研制

Development of Key Parameter Metrology and Detection Equipment for Q-switched Nd:YAG Laser Therapy Apparatus

针对脉冲激光治疗机关键参数溯源难的问题,基于LabVIEW和USB总线技术设计并研制了Q开关Nd:YAG激光治疗机关键参数计量检测装置。实现了对治疗激光和瞄准激光关键参数的计量检测及自动生成检测报告等功能,其主要功能模块有:脉宽、能量、重复频率、光斑尺寸和束散角、波长以及瞄准激光功率测量模块。在光斑测量模块中,在传统“刀口法”中引入反馈机制并实现了全自动测量,可自适应不同脉冲频率的激光。研究了其溯源方法,光斑尺寸测量不确定度达到了3.2%。对研制的装置其它参数也做了不确定度分析,包括激光波长、脉宽、能量、重复频率和瞄准激光功率,其不确定度分别为0.6 nm、4.0%、3.2%、0.12%和3.4%。

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.