The problem of calibrating Laser-Doppler Vibrometers at high frequencies

Abstract

The new international standard 16063-41:2011 provides well-defined rules for the calibration of laser-Doppler vibrometers up to 50 kHz. Recent research work addresses the enhancement of the methods defined by the standard to the frequency range up to a few hundreds of kilohertz. However, the newest generation of vibrometers can measure frequencies up to the GHz range which requires completely new approaches for calibration. Here, we demonstrate the overall characterization of the photodetector, connection cable, and analog-digital (A/D) converter transfer characteristics. This is an important step towards calibration of high-frequency vibrometers up to the GHz range.

Laser-Doppler-Vibrometer calibration by laser stimulation

“…In addition, it is not able to account for any signal preconditioning performed within the original laser head. On the other hand it suffers from far less limitations by avoiding any mechanical components [7].…”

P1.7 - Comparison of Laservibrometers and Strain Gauges as Reference Sensors for High-g Shock Accelerometer Calibration Systems

“…More detailed analyses of error sources in laser vibrometry were conducted in [5,6]. For demonstration of both amplitude accuracy and linearity of the OFV-5000-S with digital VD-09-S velocity decoder, Doppler signals representing trapezoidal velocity impulses with 20 m/s peak amplitude and varying rise time were simulated based on the relationship given in equation 7.…”

A Variable Carrier Generation for Heterodyne LDV with an Optical Phase-locked Loop

“…An LDV employs the optical coherent detection method and is widely used in industry, vehicles, robots, aerospace, biomedical field, etc. [2][3][4][5][6][7][8][9]. Compared with the contact sensors, the LDV attracts widespread attention because it enables non-contact measurements.…”