Laser-Doppler-Vibrometer calibration by laser stimulation

Research on laser doppler vibrometer calibration method based on acousto optic modulation

“…The modulation means can be divided into rotary grating, acoustooptic, electro-optic and magneto-optical. The practice of researchers is mostly based on this [3,4] . At this stage, there are only acousto-optic and electro-optic methods that have achieved results.…”

Using Commonly Available Network Equipment for Laser Doppler Vibrometer Excitation and Calibration

“…In addition, the heterodyne frequency and the bandwidth in some cases increases to 80 MHz and higher, resulting in bandwidths of up to 160 MHz and beyond. Such requirements demanded an upgrade of the laser diode setup [1]. While investigating the options for laser diode sources and drivers, we decided that it would be worthwhile to try out SFP modules developed for fibre optical networks.…”

“…The 1310 nm and the 1550 nm SFP module were tested successfully with the IR LDV. The reference PD used in [1] had to be replaced by a type appropriate for the longer wavelength (Femto Model HCA-S-400M-IN-FST). The determination of this PD's group delay is still an open task.…”

“…In [1] we presented a new method for laser Doppler vibrometer (LDV) calibration using an external amplitude-modulated laser source as an excitation source. For the HeNe laser-based LDV, a red laser diode roughly matching the HeNe wavelength was used, applying a driver capable of AM modulation up to 100 MHz.…”