KEYWORDS: Semiconductor lasers, Pulsed laser operation, Laser therapeutics, Control systems, Temperature metrology, Beam controllers, Process control, Switching, Signal processing, Light
Aiming at joint diseases such as knee osteoarthritis that seriously troubles middle-aged and elderly people, this device adopts a dual-mode laser rehabilitation treatment scheme that combines pulsed laser array stimulation and continuous laser uniform heating for patients with knee joint lesions. treat. The whole system is mainly composed of pulse drive module, constant current drive module, PID temperature control module, physical therapy temperature control module, main control module and human-computer interaction module.
An all-angle directions (AAD) evaluation method of laser spot is presented in the paper. The mathematical model for calculating the spot size at any angle is established firstly. Then, laser spot width of multiple typical angles is measured by the AAD evaluation method. Compared with the result of the traditional measurement in the horizontal and vertical directions through mechanical rotation, the differences are less than 0.15%. The differences in pixel points between the profile of the spot drawn by the laser spot obtained at different rotation angles on the detection surface are all less than 2.28%. The method can fully reflect the asymmetrical distribution of the laser spot without moving the equipment or the laser source, and avoid the influence of mechanical errors.
Since laser beam pointing stability affects the quality and accuracy of work in areas such as laser guidance and laser processing, the paper proposes a method for measuring the laser beam pointing stability based on the linearly angle-displacement transformation characteristics of F-theta lens in order to measure the pointing stability accurately and comprehensively and evaluate the performance of the laser. The method linearly converts an angular offset into a displacement offset that can be accurately measured and evaluate the pointing stability by means of finding the minimum envelope circle. Based on this method, a laser beam pointing stability measurement system with CCD camera as image acquisition unit is built for He-Ne laser source. The experimental results show that the pointing stability of the He-Ne laser is 1.500mrad. The result is only 0.186% affected by the error, which verifies the feasibility of the measurement method and the high-precision measurement of laser beam pointing stability by the system.
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