Laser Vibrometer (Single Head)

Description

Model VSM 1000 by SINUS Messtechnik GmbH

Non-Contact Vibration Measurements

The VSM 1000 Laser Vibrometer enables easy and accurate non–contact vibration measurements on all rough and diffusive surfaces (e.g.: unfinished metal, plastic, rubber, paper, fabric, etc.). It provides an analog electrical output which is a replica of the target displacement or velocity, in a frequency range from DC to 50 kHz.

• Self-mixing interferometric configuration for
• Non-contact vibrations measurement
• Class 2 laser
• Autofocus
• Small-size optical head
• Easy beam alignment with automatic speckle-tracking
• Displacement/velocity analog output
• Frequency range from dc to 50 khz
• Works on all diffusive surfaces

Principle of Operation

The Laser Vibrometers are based on the novel self–mixing interferometric scheme, and make use of a compact semiconductor diode laser. While conventional Laser Doppler Vibrometers/Velocimeters (LDVs) use the complex Michelson interferometric configuration, the self–mixing scheme is based on the coherent interference of the backscattered light directly into the laser diode, allowing for a reduced optics count. The Laser Vibrometers have a high sensitivity, which allows correct operation even for weak intensities of the light backscattered by the diffusive target surface.

Features

• Easy–to–use equipment
• Compact-size optical head
• AutoFocus system
• Displacement/Velocity analog output
• Sub-micrometer resolution

Applications

• Non-contact measurement of vibrations
• Automotive, Aerospace, and Mechanical Industry
• Vibration measurement without mass-loading on small, soft and delicate structures
• Loudspeaker and piezoceramic testing
• Material analysis and Modal analysis
• On–line process & quality control in industrial plants

Use

The laser beam is aimed at the target surface and the vibration signal is readily available from the output BNC connector. AutoFocus and Automatic Speckle-Tracking functionality allow unattended operation on any diffusive surface, while an LED-bar indicator measures optical signal strength in real-time. The vibration signal can be displayed onto an oscilloscope, or supplied to a FFT analyzer for frequency domain analysis.