共查询到19条相似文献,搜索用时 171 毫秒
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一种简单的计算机零位光栅设计方法 总被引:3,自引:1,他引:2
光栅扭矩传感器采用零位光栅提供绝对零位信号,以防止掉电时数据出错。在零位光栅设计过程中,采用了阈值法,即采用计算机随机产生栅线序列,经计算通过阈值判断以获得所需要的零位栅线序列。该方法可以大大减小编程的复杂性及难度,减小编程量,同时保证设计结果具有光通量大和对比度高的特点,并能满足实际应用的需要。 相似文献
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圆光栅传感器采用零位光栅提供绝对零位信号,以防止掉电时数据丢失.在零位光栅设计过程中,通过设置阈值,将计算机产生的随机序列转换成布尔值序列,并利用两条经验结论作为判断条件,计算、比较后得到满足要求的栅线序列.分析零位光栅刻线序列的特点,得出了一些对于零位光栅刻划具有指导意义的结论. 相似文献
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本文对柱面光栅阵列器件的零位设计原理进行讨论,并利用计算机产生区间内均匀分布的随机数方法,将“1”,“1”分别对零位栅线序列{B(I)}各元素赋值。该方法同样适用于其它计量光栅的零位设计。 相似文献
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零位光栅刻线序列的计算机模拟设计 总被引:7,自引:2,他引:5
在使用光栅进行长度和角度测量的应用中提供可靠的参考基准是非常重要的,根据零位脉冲产生的基本理论,并结合实际应用中的一些客观要求,采用计算机模拟,寻找最佳零位刻线序列,达到了预期目的,在此基础上进行了对称式零位刻线序列的设计。 相似文献
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基于二维零位光栅的高精度平面定位系统 总被引:2,自引:0,他引:2
随着微电子工业和纳米加工技术的快速发展,对超高精度的定位基准的要求也越来越高.提出一种基于特殊编码的非周期性二维零位光栅的平面定位传感器,采用在二维方向上的非周期性编码产生一个表征绝对零位的最大输出峰.当两块二维零位光栅的相互位置完全对准时,透过的光强达到峰值,峰值的半宽仅为一个光栅栅格尺寸;当两块二维零位光栅的相互位置稍有移动时,透过光强急剧衰减.用光电接受器件接受透射光强信号,经过电路处理,反馈给定位驱动装置,可以在平面内同时实现X和Y方向高精度的定位要求.采用栅格常数为5μm的光栅做实验,可以达到优于20nm的定位精度.实验表明,该平面定位系统可以满足高精度平面定位的要求,有着广泛的应用空间. 相似文献
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新型精密位移传感器用的CG200型SSPA器件 总被引:1,自引:0,他引:1
介绍新型自扫描光栅精密位移传感器用的CG200型SSPA器件,它是一种专用固体图象传感器。文中叙述了其电路工作原理、结构特点和功能及光学增透膜的作用,给出了器件的主要性能指标。最后,简单介绍了CG200构成的自扫描光栅传感器的示意图。实验结果令人满意。 相似文献
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提出了一种制作变栅距(VLS)光栅的相位扫描方法。该方法的主要装置包括一个用于控制刻划机运动的光栅干涉仪和一个相位扫描机构。如果调整光栅干涉仪,保证接收场中只有两条干涉条纹,然后改变用于对条纹进行计数的光电传感器的位置,就可以刻划出具有变栅距的刻槽。对光电式光栅刻划机的控制系统和结构都做了详细论述。按照上述方法成功刻划出了试验性的VLS光栅,它的最小栅距增量为0.33nm,并对在制作过程中产生的误差进行了讨论。采用测量衍射角的方法进行了栅距检测试验,由变栅距光栅和等栅距光栅作出的拟合曲线表明:相位扫描方法是加工具有亚纳米栅距增量的VLS光栅的有效方法,该方法对超精密定位也具有借鉴作用。 相似文献
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Abstract A binary phase grating with modulated pitch is investigated for a simple displacement encoder. The grating consists of a binary phase grating to eliminate the zeroth-order diffraction, and the pitch of the grating is modulated to compensate the higher harmonics of the encoder displacement signal. Therefore, an undistorted sinusoidal signal as a function of displacement is obtained by simply superimposing a conventional binary grating on the pitch-modulated phase gratings for any air gap between the gratings. The characteristics of the proposed gratings and the encoder signal are investigated by the Fresnel diffraction theory. The proposed grating has been fabricated lithographically, and the signal was examined experimentally. Considering these results, the proposed technique can suppress interpolation error and will be useful for an encoder in precision machining. 相似文献
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Autofocus laser rotary encoder 总被引:1,自引:0,他引:1
A laser incremental encoder with autofocus operation isproposed. In the encoder, an optical read head focuses three laserbeams upon a disk with a scaling grating. The scaling grating is areflection grating for which the height difference between adjacentpixels is one quarter of the wavelength of the laser. Each of thetwo laser beams is focused onto one of the two sections of thereflective grating, whereby the pitch of the grating can be detected byinterferometric reflection. The third beam acts to provideautofocus and is reflected from a smooth part between the two sectionsof the reflective grating. Therefore the encoder is less sensitiveto the gap between the optical read head and the scaling grating, andno precision adjustment is required. Also, the reading data arefree from the vibration and waviness of the grating surface. In theexperiments an encoder disk was fabricated from a wafer by lithographictechniques. The encoder with an 18-mm radius of the disk can reacha resolution of 2(16) = 65,536 pulses per revolution withoutelectronic interpolation. 相似文献
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粗光栅位移测量系统细分误差的来源与消除分析 总被引:3,自引:0,他引:3
本文从粗线纹光栅位移测量系统的原理出发,对里周期性变化的细分误差作了详细的理论分析,并得到了实验的验证.同时提出了从硬件上和软件上消除细分误差的方法,为进一步研制高精度数显系统打下基础。 相似文献
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Anarrow-band, precisely tunable dye laser pumped by an injection-seeded YAG laser is described. The laser achieves an output of 100 mJ/pulse and 40% efficiency when one uses Rhodamine 6G dyes. The output pulse is Gaussian both in time and spatial profile. The laser oscillator employs an intracavity étalon that is repetitively pressure scanned over one free spectral range while the grating successively steps to consecutive étalon modes. We pressure scanned the étalon under computer control using a bellows. Methods are described for calibrating the tuning elements for absolute precision. We demonstrated that the laser has an absolute precision of ±0.4 pm over a 1.0-nm scan. This accuracy is achievable over the wavelength range of a dye. 相似文献