Photo-EMF Laser Vibrometers
Brimrose Technology's VMS 2000/3000 are based on Photo-EMF detector technology. Using this technology, Brimrose Technology has shown significant improvement in Photo-EMF sensitivity using pulsed laser sources. The vibrating surface is discretely sampled by laser puulses and recorded by a Photo-EMF Sensor. Click here to depict a schematic of the experimental arrangement for the photo-EMF pulsed laser vibrometer. For more information, please contact us.
Essential Features of the Laser Vibrometer:
  • Contact-less, Compact
  • High Sensitivity Measurements
  • NOT Sensitive to Speckle Patterns - no surface pre-treatment required
  • No Need for "Fringe Counting"
  • Real Time Monitoring
  • High Detection Bandwidth
  • Wireless or Internet Communication Available
  • Up to 200 KHz Bandwidth
  • Integrated Laser Pointers for Visual Target Positioning
  • Scanning Distance 1m (up to 4m available upon request)
  • Single Point Measurements (Differential, 3D/Multi-Axis, Angular and in plane measurements are available upon request)
  • 60 Picometer 10-12 Displacement - World Record Achieved at Brimrose
Main Industrial and Military Applications:
APPLICATIONS ABSTRACTS -
VMS APP-1: Laser vibrometer using photoelectromotive-force sensors

We demonstrate experimentally significant improvement in the sensitivity of photoelectromotive-force (photo-EMF) laser vibrometers. The vibrating surface is discretely sampled by individual laser pulses and recorded by the photo-EMF sensor via the generation of photocurrent pulses whose magnitudes are proportional to the instantaneous surface displacements. With a sufficiently high sampling rate, reconstruction of the vibration wave form can be achieved by conducting envelope or peak! detection of the resultant series of photocurrent pulses. Significantly higher peak optical power levels of the probe laser pulses, which can be orders of magnitude greater than those of continuous-wave interrogation lasers with the same average power, lead to proportional enhancement in the photo-EMF response and remarkable improvement in detection sensitivity when the photodetection process is initially amplifier noise current limited. Copyright American Institute of Physics
More Military Research Applications:
  • RF Terrain Mapping and Target Profiling
  • RF Radar Spectral Analysis
  • Standoff Non-contact Human Life Sign Detection
  • Buried Landmine Detection (Army)
  • Moving Vehicle Laser IED Detection
  • Border Security / Remote Smuggling Detection