TEMPO High Frequency Laser Ultrasonic receiver & vibrometer
TEMPO High Frequency Laser Ultrasonic receiver & vibrometer
TEMPO High Frequency Laser Ultrasonic receiver & vibrometer
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<strong>TEMPO</strong><br />
<strong>High</strong> <strong>Frequency</strong> <strong>Laser</strong> <strong>Ultrasonic</strong> <strong>receiver</strong> & <strong>vibrometer</strong><br />
‣ PERFORMS:<br />
• <strong>Ultrasonic</strong> measurements up to 1 GHz bandwidth<br />
• Sub-picometer displacement measurement on any surface<br />
or material<br />
‣ ENABLES:<br />
• Non-destructive testing in laboratory environment<br />
• Full-field analysis and fibered collection capability<br />
• Non-contact ultrasonic resonant spectroscopy<br />
Bossa Nova Technologies, Venice, USA<br />
©2007 Bossa Nova Technologies, LLC. All rights reserved
<strong>TEMPO</strong> <strong>High</strong> <strong>Frequency</strong> Vibrometer<br />
Thanks to Bossa Nova Technologies innovative approach, it is now possible<br />
to measure sub-picometer displacement/vibrations at high frequency on<br />
any surface type.<br />
Based on photorefractive two-wave mixing, <strong>TEMPO</strong> works at optimum<br />
performance even with a multi-speckle beam. <strong>TEMPO</strong>’s large aperture<br />
collects more optical power on diffusing surfaces than a classical<br />
interferometer, which directly translates into higher sensitivity and signal<br />
to noise ratio.<br />
<strong>Ultrasonic</strong> Wave<br />
Arrival #1<br />
Sub-nanometer displacements observed<br />
with <strong>TEMPO</strong> on a rough metallic surface<br />
Displacement in nm<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
-0.2<br />
-0.4<br />
<strong>Ultrasonic</strong> Wave<br />
Arrival #2<br />
<strong>Ultrasonic</strong> Wave<br />
Arrival #3<br />
Generation: pulsed Nd:YAG <strong>Laser</strong><br />
Bandwidth: 125 MHz<br />
Probe <strong>Laser</strong>: 200 mW, CW<br />
200 mm stand-off distance<br />
Single-shot measurement<br />
-0.6<br />
-0.8<br />
0 2 4 6 8 10<br />
Time in µs<br />
<strong>TEMPO</strong> features<br />
‣ Internal electro-optic compensation loop for superior signal stability<br />
‣ Broadband measurements (up to 1 GHz)<br />
‣ <strong>High</strong> sensitivity on all surface types and materials: composites, paper,<br />
rusted metals, ceramics, rocks.<br />
‣ Point & shoot operation: easy signal optimization<br />
‣ Automatic Absolute Calibration for direct reading of the output signal in<br />
nanometers<br />
©2007 Bossa Nova Technologies, LLC. All rights reserved
<strong>TEMPO</strong> <strong>High</strong> <strong>Frequency</strong> Vibrometer<br />
Technical background - Photorefractive Two-wave mixing<br />
A dynamic hologram resulting from the interferences between the reference<br />
beam and the signal beam is recorded in the photorefractive crystal. The<br />
response time of the process allows for compensation of the slow phase<br />
change of the signal beam. The diffraction of the reference beam by the<br />
dynamic hologram creates a local oscillator adapted to the signal (i.e. same<br />
wave front and same direction). As a result, optimum efficiency is obtained<br />
between the two beams interfering on the detector. Two-wave mixing in a<br />
photorefractive material is equivalent to an adaptive beam splitter.<br />
BSO<br />
Signal beam<br />
(speckle)<br />
Full-field analysis – 2D SCANNER<br />
By adding a scanner, <strong>TEMPO</strong> allows a full field analysis of ultrasonic<br />
signals by providing a 3D mapping of the surface with a 1 ns time<br />
resolution. Turn-key systems (<strong>TEMPO</strong> + SCANNER + OSCILLOSCOPE +<br />
COMPUTER + SOFTWARE) are available.<br />
Turn-key system for full-field analysis<br />
Sample surface at t 0<br />
<strong>TEMPO</strong><br />
ACCESSORIES<br />
At t 0<br />
+1 µs<br />
At t 0<br />
+2 µs<br />
Remote access – FIBER HEAD<br />
Adding a fiber head provides extra flexibility and modularity to <strong>TEMPO</strong><br />
for the remote inspection of hard-to-reach areas.<br />
©2007 Bossa Nova Technologies, LLC. All rights reserved
TECHNICAL SPECIFICATIONS<br />
NESD (Noise Equivalent Surface<br />
Displacement)<br />
Analog outputs<br />
Detection bandwidth: upper limit<br />
Detection bandwidth: lower limit<br />
Photorefractive low frequency cutoff<br />
Operating wavelength<br />
Suitable CW <strong>Laser</strong> power<br />
Spot diameter on sample<br />
Optical stand-off<br />
Optical collection F number<br />
Depth of focus<br />
Absolute displacement calibration<br />
(internal calibrated piezo mirror)<br />
<strong>TEMPO</strong> dimensions<br />
Electrical requirements<br />
Available accessories<br />
2. 10 -7 nm ( W/Hz) 1/2 (measured on the photodetector)<br />
- AC signal (50 ohms BNC) proportional to surface<br />
displacement<br />
- DC signal (SMB), proportional to object reflectivity<br />
- Calibration output in mV/nm (SMB)<br />
20 MHz, 120 MHz or 1 GHz<br />
20 KHz, 100 KHz or 1 MHz standard<br />
10Hz – 100Hz (depending on laser power and crystal)<br />
1kHz with the internal electro-optic compensation loop ON<br />
532 nm<br />
150 mW to 400 mW internal/ up to 15 W external<br />
From 150 to 750 microns<br />
from 100 to 500 mm<br />
N = 2, 4, 10<br />
From 2 to 50 mm<br />
Automatic display of Calibration coefficient (mV/nm)<br />
Analog Output (<strong>High</strong> impedance) of the Calibration<br />
coefficient<br />
495 x 305 x 114 mm (19.5”x12”x4.5”) – 20 lbs<br />
110/220 V, 50/60 Hz<br />
2D Scanner, fiber head, custom designs<br />
CONTACT US for more information<br />
BOSSA NOVA TECHNOLOGIES<br />
606 Venice Blvd, Suite B<br />
Venice, CA 90291 USA<br />
Tel: (310) 577-8113 - Fax: (310) 943-3280<br />
info@bossanovatech.com -www.bossanovatech.com<br />
Due to Bossa Nova Technologies continuous product improvement policy, specifications are subject to<br />
change without notice. ©2007 Bossa Nova Technologies, LLC. All rights reserved
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