基于脉冲占空比调节灵敏度的光电开关传感器

发布时间：2018-03-24 07:22

本文选题：传感器　切入点：光电开关　出处：《传感技术学报》2017年01期

【摘要】：调整光电开关传感器的检测距离可通过调节其灵敏度来实现。该研究讨论了脉冲占空比对红外光电开关传感器灵敏度的影响,提出了基于脉冲占空比调节红外光电开关传感器灵敏度的技术方法。以连续周期矩形脉冲信号为例进行了傅里叶级数展开,得到了直流电压分量和倍频信号电压幅值与占空比的正弦函数关系,并仿真分析了占空比与基频信号电压幅值的相关性,实验测量了占空比对传感器相对灵敏度影响的关系曲线。结果证明,在不改变矩形脉冲电压幅度和频率的情况下,通过调节占空比δ可以改变传感器的灵敏度。即当0δ50%时,灵敏度随δ增大而增大;当δ=50%时,灵敏度最大;当50%δ100%时,灵敏度随δ增大而减小。在红外光电开关传感器上应用该技术方法,实现了利用软件控制占空比来调节传感器的检测距离。
[Abstract]:The detection distance of photoelectric switch sensor can be adjusted by adjusting its sensitivity. The effect of pulse duty ratio on the sensitivity of infrared photoelectric switch sensor is discussed. A method of adjusting the sensitivity of infrared optoelectronic switch sensor based on pulse duty cycle is presented. The Fourier series expansion of continuous periodic rectangular pulse signal is presented. The sinusoidal function between the DC voltage component and the voltage amplitude of the double frequency signal and the duty cycle is obtained, and the correlation between the duty cycle and the voltage amplitude of the fundamental frequency signal is simulated and analyzed. The effect of duty cycle on the relative sensitivity of the sensor is measured experimentally. The results show that the sensitivity of the sensor can be changed by adjusting the duty cycle 未 without changing the amplitude and frequency of the rectangular pulse voltage. The sensitivity increases with the increase of 未; when 未 = 50, the sensitivity is maximum; when 未 is 50%, the sensitivity decreases with the increase of 未. The detection distance of the sensor is adjusted by using the software to control the duty cycle.
【作者单位】：潍坊医学院生物科学与技术学院;重庆大学生物工程学院;
【基金】：国家支撑计划课题项目(2013BAI03B04) 山东省自然科学基金项目(ZR2014EEP011) 中华医学会医学教育分会和中国高等教育学会医学教育专业委员会教学研究项目(2016B-RC074) 潍坊医学院教学研究项目(2015Y008)
【分类号】：TP212

【相似文献】