CPLD-Based Displacement Measurement System for Nanoscale Grating Ruler

Nanoscale Displacement and Strain Measurement

The mechanical testing of micro-electro-mechanical systems (MEMS) and nano-electro-mechanical systems (NEMS) requires precise measurements of displacement and strain in the nanometer scale. Integrated testing devices, including specimens, actuators and sensors, were designed and fabricated to overcome the aligning and gripping difficulties faced by previous separated micromechanical testing app...

Subnanometer Displacement Measurement Using Common-path Grating Interferometry

Imaging by a phase grating used in displacement measurement

Precision displacement measurement with a phase grating based on grating imaging is proposed. In this imaging system, a conventional amplitude grating as a scale is replaced by a phase grating. That generates a sinusoidal pattern, which works as an optical scale, with higher amplitude than the conventional imaging system with an amplitude grating. In this paper, analysis using an optical transf...

An Optical Fiber Lateral Displacement Measurement Method and Experiments Based on Reflective Grating Panel

An optical fiber sensing method based on a reflective grating panel is demonstrated for lateral displacement measurement. The reflective panel is a homemade grating with a periodic variation of its refractive index, which is used to modulate the reflected light intensity. The system structure and operation principle are illustrated in detail. The intensity calculation and simulation of the opti...

Dynamic Sensing Performance of a Point-Wise Fiber Bragg Grating Displacement Measurement System Integrated in an Active Structural Control System

In this work, a fiber Bragg grating (FBG) sensing system which can measure the transient response of out-of-plane point-wise displacement responses is set up on a smart cantilever beam and the feasibility of its use as a feedback sensor in an active structural control system is studied experimentally. An FBG filter is employed in the proposed fiber sensing system to dynamically demodulate the r...