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摘要:
为解决目前摆镜检测系统采样率低，难以满足高频摆镜测量需求的问题，根据等效采样原理，设计了基于高速激光闪频技术的多时序高精度非接触式摆镜检测系统。该系统首先利用激光脉冲控制电路实现多时序的闪频激光照明，在CCD靶面上获得光斑位置图像；然后，根据激光光斑成像位置计算摆镜的摆角，并依照相邻光斑位置之间的时间间隔得到角速度。实验结果表明：检测系统的角度分辨力为0.005°，动态采样时间间隔可以达到百微秒量级，角速度测量误差小于±7%。该系统提高了摆镜测量的采样率，满足了高频摆镜测试的要求。
Abstract:In order to solve the problem of low sampling rate and to meet the requirements of high frequency swing mirror measurement, based on the principle of equivalent sampling, a multi time series high accuracy non-contact swing mirror detection system is designed. First, with the laser pulse control circuit, multi time sequence flashing laser lighting is achieved and the spot position is obtained on the CCD target plane. Then, according to the image of the laser spot position, calculate the mirror swing angle and angular velocity by the time interval between adjacent spot positions. The experimental results show that the angle resolution of the detection system is 0.005°. The time resolution can reach the microsecond order, and the angular velocity measurement error is less than ±7%. The system improves the sampling frequency of swing mirror measuring and meets the requirements of high frequency swing mirror test.
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Key words:
- swing mirror /
- high-frequency /
- flash frequency /
- multi timing measurement
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Overview: The angular velocity of swing mirror and its uniformity have an important influence on the working quality of the system. Some research institutions have studied the angle measurement of the swing mirror. But for the dynamic swing mirror, especially the high frequency swing mirror, because of the CCD frame rate, the common test system cannot meet the requirement of high sampling rate in the measurement process. In order to solve the problem of low sampling rate in current swing mirror detection system, a multi time series high accuracy non-contact detection system for swing mirror is designed, which is based on the principle of equivalent sampling.
In the measuring system, when the laser is reflected by the swing mirror, a light spot is obtained on the receiving screen. The position of the spot moves with the swing of the swing mirror. The angle of the swing mirror is calculated by the position of the laser spot, and the angular velocity is obtained according to the adjacent angles and the interval time. In order to adapt to high frequency swing mirror, we realized flashing laser lighting with the designed laser pulse control circuit to replace the camera exposure time in the general measurement systems with the laser pulse duration, and acquired the separate light spot images by adjusting the laser spot size and the pulse cycle. At the same time, in order to improve the sampling rate of the system, we used time sequence logic control circuit to generate multi time pulse signal and achieve the equivalent sampling, so as to improve the sampling rate of the system and meet the test demands.
In order to confirm the feasibility of the test method, the test system was set up and was used to test the swing mirror at different working frequencies. The experimental results show that the angle resolution of the detection system is 0.005°. The time resolution can reach the microsecond order, and the angular velocity measurement error on different frequencies is less than ±7%. In summary, we believe this system and method can improve the sampling rate of the swing mirror measurement and have the adjustable sampling frequency can meet the dynamic non-contact measurement requirements with high frequency angular speed and amplitude and other parameters under different working frequencies.
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图 2 多时序闪频激光反射点测量原理
Figure 2. Principle of the multi time flash laser reflection point measurement
图 6 正程光斑图像。(a)无延迟；(b)延迟200 μs；(c)延迟400 μs；(d)延迟600 μs；(e)延迟800 μs
Figure 6. Photos of light spots in positive direction. (a) No delay; (b) Delay 200 μs; (c) Delay 400 μs; (d) Delay 600 μs; (e) Delay 800 μs
图 7 返程光斑图像。(a)无延迟；(b)延迟200 μs；(c)延迟400 μs；(d)延迟600 μs；(e)延迟800 μs
Figure 7. Photos of light spots in negative direction. (a) No delay; (b) Delay 200 μs; (c) Delay 400 μs; (d) Delay 600 μs; (e) Delay 800 μs
图 8 摆镜50 Hz时测量值。(a)角度；(b)角速度
Figure 8. Measured values of swing mirror at 50 Hz. (a) Angle; (b) Angular velocity
图 9 摆镜25 Hz时测量值。(a)角度；(b)角速度
Figure 9. Measured values of swing mirror at 25 Hz. (a) Angle; (b) Angular velocity
表 1 转角位置与光斑位移
Table 1. Angle positions and spot displacements
角度值/(°) 光斑位移/mm 角度值/(°) 光斑位移/mm 0.00 0.0000 0.00 0.0000 0.50 8.6498 -0.50 -8.6465 1.00 17.3091 -1.00 -17.3131 1.50 25.9429 -1.50 -25.9805 2.00 34.9149 -2.00 -34.9716 2.50 43.4685 -2.50 -43.6283 
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表 2 测量结果分析
Table 2. Analysis of measured results
摆镜状态 摆镜角速度/(°·ms-1) 测量平均值/(°·ms-1) 标准差/(°·ms-1) 变异系数/% 50 Hz正程 0.50 0.5043 0.0142 2.82 50 Hz返程 -0.50 -0.5030 0.0128 -2.55 25 Hz正程 0.25 0.2526 0.0072 2.83 25 Hz返程 -0.25 -0.2518 0.0071 -2.82
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