Position Measurement over Wide Range by Simultaneous Use of Low and High Coherence Light Source
Journal Title: Elektronika - Year 2015, Vol 19, Issue 2
Abstract
In this paper we propose and experimentally demonstrate a new technique for position/displacement measurement using fiber optic interferometry. We simultaneously employ a low- and a high- coherence light source in the same opto-mechanical configuration. The low coherence signal was obtained using a Fizeau receiving interferometer, implemented as an optical glass wedge, accompanied by a linear CCD array. Combining low- and high-coherence parts was possible because we showed that the accuracy of low-coherence based position measurement was better than 50 nm, less than the high coherence signal periodicity. We verify the method in the dynamic range of low-coherence measurement of about 100 um, while the accuracy of the high-coherence part was about ±1 nm. Thus, the method provides more than 100,000 measuring points. The advantages of this sensing technique include absolute position/displacement measurement in a large dynamic range with nanometer accuracy.
Authors and Affiliations
Miloš C. Tomić, Zoran V. Đinović
Keywords
Related Articles
- EP ID EP362692
- DOI 10.7251/ELS1519074T
- Views 69
- Downloads 0
Operational Transconductance Amplifier in 350nm CMOS technology
This paper presents transistor level design of operational transconductance amplifier in CMOS technology. Custom designed, circuit is to be built-in into the mixed-signal, switched capacitor circuit. Amplifier targets re...
Amplitude Malformation in the IFFT Ocean Wave Rendering under the Influence of the Fourier Coefficient
Although Tessendorf’s IFFT Gerstner wave model has been widely used, the value of A, a constant of the Fourier coefficient, is not given. A will strongly influence the shape of the rendered ocean wave and even cause ampl...
Single DD-DXCCII based quadrature oscillator with simultaneous current and voltage outputs
In this paper, a versatile quadrature oscillator using single Differential Difference Second Generation Dual-X Current Conveyor (DD-DXCCII) as an active element, two grounded capacitors and three grounded resistors is pr...
USB HW/SW Co-Simulation Environment with Custom Test Tool Integration
This paper describes a new verification environment for USB 2.0 controller. New methodology is presented, where a co-simulation environment is used as one of the starting points for the embedded hardware/software develop...
A Study of Inverter Drives and Its Ride Through Capabilities in Industrial Applications
In modern industry, majority of the mechanical elements are driven by either induction motors or special motors like servo motors, synchronous motors, BLDC motors. In order to drive the motors and to vary the speed of th...