共查询到17条相似文献,搜索用时 109 毫秒
1.
2.
3.
输出正交正弦波的光栅尺在位移测量中的脉冲细分原理 总被引:2,自引:0,他引:2
讨论了输出正交正弦波的光栅尺 (又称光栅线位移传感器 )在位移测量中的脉冲细分原理。基于该原理 ,可将光栅尺位移测量分辨率提高 1~3个数量级。还介绍了单片机光栅尺位移测量系统 ,该系统具有自动消除累积误差、计数长度无限制的特点。 相似文献
4.
基于长周期光栅边缘滤波解调的光纤布喇格光栅位移传感研究 总被引:2,自引:2,他引:0
利用长周期光栅的边缘滤波解调技术,我们报道了一种光纤布喇格光栅位移传感方法.系统由一个3dB耦合器、一个传感光纤布喇格光栅、一个长周期光栅和一个探测器构成.实验结果表明,在所测位移范围内,传感系统输出的光功率与位移成良好的线性关系,位移灵敏度为9.24pW/mm,位移分辨率为0.01 mm.该方案结构简单、灵敏度高、线性度好,可应用于实际中的位移测量. 相似文献
5.
实验将新型光栅传感器应用于微位移测量之中。通过比较线(角)位移与莫尔条纹移动个数之间的关系,实验发现,在微位移测量中光栅传感器具有极好的线性度(R2≥0.999)和精确度(误差≤2.0%)。实验验证了光栅传感器在微位移测量中可行性和可靠性。 相似文献
6.
光栅传感智能位移测量系统 总被引:6,自引:2,他引:4
光栅传感智能位移测量系统是集光、机、电、算为一体的新型智能仪器。其原理是利用光栅传感器将欲检测的位移信息量转变为电信号 ,并经前置放大和电路处理后 ,送入 80 31单片机的T0 、T1计数端 ,经运算处理后 ,将被测位移量输出并通过LED显示。详细地介绍了整体电路的设计 ,包括位移信号的检取 ,细分判向及 80 31单片机系统的软、硬件设计 相似文献
7.
8.
9.
10.
11.
In this study, a displacement measurement method based on digital moiré fringe is described and experimentally demonstrated. The method is formed by only one grating with a constant pitch. First, the magnified grating image is received by an imaging array and is sent to a computer. Then, the digital moiré fringes are generated by overlaying the grating image with its mirrored one. Finally, a specifically designed algorithm is used to obtain the fringes’ phase difference before and after movement and calculate the displacement. This method has the effects of amplifying displacement and averaging the grating lines error, the same as the traditional moiré technique using two pieces of gratings. At the same time, the proposed system is much easier to assemble and the measurement resolution can be set more flexibly. One displacement measuring system based on this method was built up. Experiment results show that its measurement errors are less than 0.3 μm and less than 0.12 μm at the resolutions of 0.1 μm and 0.03 μm, respectively. 相似文献
12.
Micro-measurement using grating microscopy 总被引:2,自引:0,他引:2
In this paper, two quantitative methods to measure micro-deformation using grating microscopy are proposed, a grating diffraction method and a full-field grating phase-shift method. A compact optical transmitting microscope with white light source is reconstructed by developing a loading and recording system. For direct strain measurement, a grating diffraction method is presented. With the help of a Bertrand lens, the Fourier spectrum of the grating is formed on the CCD sensor plane with high image quality. Software for precise, fast and automatic determination of the diffraction spot centroids is developed. Local strains are thus measured with high resolution. For the deformation measurement, a phase-shifting grating microscope method with high sensitivity and spatial resolution is proposed. Phase-shifting is based on the slab refraction effect and is realized via a tilting compensator. The system possesses a high spatial resolution (1 μm), and a displacement precision of 0.1–0.03 μm. The combination of the grating diffraction method and the phase-shifting method in the same test provides simultaneous measurement of strain and displacement, thus demonstrating that the grating techniques are viable in the microscope environment. 相似文献
13.
光栅尺作为高精度位置测量仪器,其分辨率受制于超精密的空间刻划技术,测量精度急需通过电子学细分法来提高.为此,提出了"时空转换"的思想:借助于载波调制理论,引入了恒定的时空当量,将对空间位移的测量转换为对信号瞬时周期的测量.首先,进行了时空转换法的数学推导,探究了正弦波光栅尺位移的测定和移动方向的判别方法;然后,在DSP开发平台下,搭建出基于时空转换法的正弦波光栅尺位移测量系统;最后,从实验数据以及光栅信号的残余直流电平、幅值不均衡、相位不正交等方面进行了误差分析.实验表明:栅距为8 mm的正弦波光栅尺,在时空转换法下,平均测量误差为± 0.258 1μm ,兼顾了细分与辨向. 相似文献
14.
15.
16.