The Quartet.

Multi-purpose receiver

Our multi-purpose laser receiver is suited for a wide range of acoustic and ultrasonic applications from the laboratory to the factory and available in the visible or infrared. Based on our patented multi-channel random quadrature detection technology, the system is designed for remote detection of sub-nanometer displacements. We like to think of the Quartet as our laser-based interferometer equivalent of the swiss-army-knife. Suitable for a wide range of applications, it offers high sensitivity, requires low to no maintenance, can be fitted with a variety of laser wavelengths, and is capable of rapid scans and measurements. The Quartet was born of a research and development grant by NASA and the National Science Foundation.

Specifications.

Technology

Multi Channel Random Quadrature

Detection

Out-Of-Plane

Configuration

Optical Fiber

Internal Laser power

Up to 3W All Wavelength

NESD (out-of-plane motion)

1.10-5 nm/Hz1/2

Detection bandwidth

Up to 100MHz

Dimensions

381 x 381 x 152 mm3

Weight

15kg

Electrical requirements

110V / 220V
50Hz / 60Hz

Features.

  • System technology not dependent on laser wavelength: Can be fitted with lasers ranging from visible to IR
  • Fiberized
  • Inspection on rapidly moving object
  • High sensitivity on all surface types and materials
  • Continuous, modulated or long pulse detection laser

Specifications.

Specifications.


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  • System technology not dependent on laser wavelength: Can be fitted with lasers ranging from visible to IR

  • Fiberized

  • Inspection on rapidly moving object

  • High sensitivity on all surface types and materials

  • Continuous, modulated or long pulse detection laser

Technology

Multi Channel Random Quadrature

Detection

Out-Of-Plane

Configuration

Optical Fiber

Internal Laser power

Up to 3W All Wavelength

NESD (out-of-plane motion)

1.10-5 nm/Hz1/2

Detection bandwidth

Up to 100MHz

Dimensions

381 x 381 x 152 mm3

Weight

15kg

Electrical requirements

110V / 220V – 50Hz / 60Hz

Applications.


From the laboratory to the industry our Laser ultrasound technologies are well suited to a wide range of applications.

On-Line Inspection and Quality control
When propagating through a specimen, the ultrasonic waves carry information about the inner structure. Similarly, when propagating along a surface, the information about the surface quality and surface coatings can be extracted. 

Thickness measurement
If the sonic velocity of the material is known, it is possible to measure the thickness of the specimen. Using a pulse-echo configuration (detection and generation on same side and superimposed), with the velocity of sound c and the time t between two peaks, the distance d in the material can be calculated.

Technology


Sound & Bright’s various technologies were born from a research and development grant from NASA and the National Science Foundation and are now marketed worldwide.

The receiver combines the advantages of homodyne interferometry with the benefits of multi-detector technology. The beam reflected by the sample’s rough surface is comprised of many speckles. The multi-speckled signal beam is combined with the reference beam and focused on 50 photo-detectors. Each detector collects a few speckles and delivers a homodyne signal.

Each homodyne signal is processed in parallel using a patented signal processing architecture. The signal processing is based on a “random quadrature” demodulation scheme which takes advantage of the random phase distribution inherent to speckle light. The detectors produce a time-varying analog voltage that is proportional to the rectified instantaneous surface displacement at ultrasonic frequencies.

Documentation.