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ENABLES

PERFORMS

Due to Bossa Nova Technologies continuous product improvement policy, specifications are subject to

change without notice.©2010 Bossa Nova Technologies, LLC. All rights re served

QUARTETIndustrial Laser Ultrasonic Receiver  

• High sensitivity displacement measurements on any surface, anymaterial and any condition (moving/high temperature sample)

• Ultrasonic measurements up to 20 MHz bandwidth

QUARTET Laser Ultrasonic receiver

TECHNICAL SPECIFICATIONS

By adding a scanner , QUARTET  allows a full

field analysis of ultrasonic signals by providing a

3D mapping of the surface with a 1 ns time

resolution. Turn-key systems (QUARTET +

SCANNER + OSCILLOSCOPE + COMPUTER +

SOFTWARE) are available.

QUARTET

ACCESSORIES

Adding a 2”  light collection  to

the fiber head  provides extra

sensitivity to the flexibility

provided by the fiber head.

Bossa Nova Technologies

11922 Jefferson Blvd

CULVER CITY - CA 90230

USA

Tel: (310) 577-8113

Fax: (310) 943-3280

info@bossanovatech.com

www.bossanovatech.com

• High frequency, sub-nanometer vibrometry

• Non-destructive testing in industrial environment

• Non-contact ultrasonic inspection

• Piezo-transducer characterization

NESD (Noise Equivalent Surface

Displacement) 1. 10-5 nm/Hz1/2 

Detection Bandwidth Upper limit  Up to 50 MHz

Detection Bandwidth Lower limit  100 kHz or 1 MHz 

FiberMultimode - 50 micron diameter

Length to be specified when ordering

Spot diameter on sample  60 micron to 500 micron (f=50mm to 500 mm) 

Optical stand-off   From 50 mm to 500 mm

Diameter of collecting aperture  1" (25mm) to 2" (50mm) 

Depth of focus  from 0.3 mm to 50 mm

Analog OUTPUTS AC signal (Full bandwidth) 

Calibration Level

Suitable laser power  500mW, 1W or 1.5 W (internal) - Up to 15 W external 

Electrical requirement  110/220 V, 50/60 Hz

Dimensions / Weight 381mm x 381mm x 152mm - 15 kg

OPTIONS 2D scanning set-up including PC, software,

digitalization card and X-Y translations

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T E C H N I C A L B A C K G R O U N DBossa Nova Technologies  introduces its Laser receiver QUARTET  for non-destructive testingapplications in factory conditions. Based on multi-channel random quadrature detection

technology, QUARTET  is designed for remote detection of sub-nanometer  displacements. Nopath stabilization is required. The stability of the interferometer is based on the multi-channel,

parallel demodulation that is done electronically.

Associated with a compact and light fiber head to deliver the probe beam on the sample and collect

the backscattered light,QUARTET is the perfect ultrasonic receiver for fast and reliable scan.

Each homodyne signal is processed in parallel using a patented signal processing

architecture, based on " random quadrature"  demodulation scheme (taking 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. 

• Simple Design  No optical path control, stabilization or compensation.

• Fiber system  Small and compact fiber head dedicated for fast and reliable scan. 

• High sensitivity & low laser power More detectors collect more light, sensitivityincreases, required laser power decreases.

• Any surface/material   Light collection efficiency combined with a speckle processingtechnique allows the inspection of any kind of surface (rough, porous, rusted or mirror-like)or material (composite, steel or paper).

• Robust, Stable & Compact  Not subject to stability issues common to long cavity and path-stabilized interferometers because it does not require control of the optical pathlength. Does not use high accuracy optical components or positioning, which makes itexceptionally rugged.

• Low-cost  Simple design and low laser power decreases the cost of the receiver, the costof the inspection system and the overall maintenance cost.

• CW/Pulsed operation  The output beam can be intensity-modulated in order to reducethe average optical power when a fragile sample is measured, without degrading the

 performance of the receiver.

• 2D scanning   2D scanning is very easy with QUARTET. Thanks to the multi-speckleinterferometry, no more signal fading due to the collection of a dark speckle.

Multi-detector

   S   p   e   c    k    l   e

    p   r   o   c   e   s   s   i   n   g

Signal

out

Signal

beam

Probe

beam

SampleOptical path

differenceReference

beam

©2013 Bossa Nova Technologies, LLC. All rights reserved

Q U A R T E T F E A T U R E S

QUARTET combines the advantages of homodyne interferometry  and multidetector  ability .

The beam reflected by the sample rough surface has many speckle. The multi-speckled beam

(signal beam) is combined with the reference beam (Local oscillator) using a beam combiner.

Each detector collects few speckle and delivers an homodyne signal.

INSPECTION OF CARBON FIBER COMPOSITEB-scan

C-scan

Time signal

Echo 1

Echo 2

Echo 3

Coupled with a 2D scanner, QUARTET maps compositethickness variations as well as internal and external

defects as shown on the following B-scan and C-scan.

Thickness 1

Thickness 2

External defect

SCAN

Defects observed with

QUARTET

CARBON FIBER

COMPOSITE

2 different thicknesses

Internal defect (square)

External defect (round)

QUARTET  is the ideal receiver for Laser Ultrasonic inspection in factory  conditions. It  provides  high sensitivity  on moving or static

objects and can be used with low power laser.

• Non-contact measurement

•

 Sensitive on any surface/material type•  Insensitive to external vibrations

• Compact & robust design

Thanks to QUARTET  Laser Ultrasonic inspection systems  willprovide satisfaction in  performance, reliability  and  cost  to

manufacturers in the steel, paper, glass, automotive and aerospace

industries.

COMPACT AND

COST-EFFECTIVE

Industrial Solution

QUARTET Laser Ultrasonic receiver