Difference between revisions of "Exotic Ultrasonics for the real world"

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==details==
 
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Grant Number:
 
  
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Staff involved:
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==Custom CMOS modulated light cameras for parallel detection in picosecond ultrasonics==
  
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other things to add.
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We have developed a custom CMOS linear array detector for picosecond ultrasound measurements. Performing many measurements in parallel allows us to dramatically reduce the time it takes to perform each measurement.
  
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==Introduction==
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The signals we are interested in are tiny fluctuations on a large DC background, these types are signals are typically extracted by modulating the signal of interest and using a lock in technique.
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The project was to investigate ways to make high frequency ultrasonic measurements more practical and applicable to real world applications.
 
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Our approach to improve the utility of these experiments is to dramatically reduce experiment time by parallelizing the measurements. Two approaches were adopted - developing high frequency parallel camera working in the 1-10 GHZ range for real time measurement of the ultrasonic signals, and parallelization of the traditional approach of lock in detection.
 
  
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Picosecond laser ultrasound is an established technique for material characterization. The frequencies involved span from ~1 - 100's of GHz.
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The linear array camera we have developed, consists of a line of active pixel sensors, each one has a very large photon capacity to allow it to reach the high signal to noise ratios required to enable us to see the tiny signals present in our experiments. Each pixel has four charge storage areas for capturing four samples during one modulation cycle. Demodulating these samples allows us to measure the amplitude and phase of our signals. The cameras can be locked to a wide range of modulation frequencies.
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tbc.
 
  
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{|align="center"
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|[[Image:Ultrafast_Camera.PNG | 150px ]]
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|[[Image:Ultrafast_Thicknessline.png | 300px]]
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|[[Image:Ultrafast_PaperFig.png | 300px ]]
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This new detector allows imaging of sample properties, such as coating thickness, over large areas where previously only point measurements were feasible. These camera have allowed us to reduce experiment time by over 30 times compared to the single point detector approach.
  
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==Achievements==
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<br style="clear:both" />
  
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[[Image:Ultrafast_Camera.PNG | 150px | right]]
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==Related publications==
  
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<bibtex>
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@article{smith_parallel_2010, title = {Parallel detection in laser ultrasonics}, volume = {214}, issn = {1742-6596}, url = {http://dx.doi.org/10.1088/1742-6596/214/1/012006}, journal = {Journal of Physics: Conference Series}, author = {R J Smith and R A Light and N Johnston and S Sharples and M C Pitter and M G Somekh}, year = {2010}, pages = {012006}, pdf = {http://optics.eee.nottingham.ac.uk/w/images/8/8a/Paper_2009_ICPPP_Leuven_Parallel_Detection_RJS.pdf} }</bibtex> 
  
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<bibtex>@article{smith_multichannel_2010, title = {Multichannel, time-resolved picosecond laser ultrasound imaging and spectroscopy with custom complementary metal-oxide-semiconductor detector}, volume = {81}, issn = {00346748}, url = {http://dx.doi.org/10.1063/1.3298606}, number = {2}, journal = {Review of Scientific Instruments}, author = {Richard J. Smith and Roger A. Light and Steve D. Sharples and Nicholas S. Johnston and Mark C. Pitter and Mike G. Somekh}, year = {2010}, pages = {024901}, pdf={http://optics.eee.nottingham.ac.uk/w/images/0/0d/Paper_2010_RevSciInstru_CMOS_Parallel_detection.pdf} }, </bibtex>
  
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we have built two generations of modulated light cameras specially designed for pump probe measurements. The first device had 64 pixels and  
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<bibtex>
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@article{smith_parallel_2008, title = {Parallel detection of low modulation depth signals: application to picosecond ultrasonics}, volume = {19}, issn = {0957-0233}, shorttitle = {Parallel detection of low modulation depth signals},url = {http://dx.doi.org/10.1088/0957-0233/19/5/055301}, number = {5}, journal = {Measurement Science and Technology}, author = {R J Smith and M G Somekh and S D Sharples and M C Pitter and I Harrison}, postauth = {C Rossignol}, year = {2008}, pages = {055301},pdf={http://optics.eee.nottingham.ac.uk/w/images/8/89/Paper_2008_MST_Parallel_Detection_RJS.pdf} }</bibtex> 
  
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<bibtex>
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@inproceedings{light_highly_2010, address = {San Francisco, California, {USA}}, title = {Highly parallel CMOS lock-in optical sensor array for hyperspectral recording in scanned imaging systems}, url = {http://dx.doi.org/10.1117/12.842083}, author = {Roger A. Light and Richard J. Smith and Nicholas S. Johnston and Steve D. Sharples and Michael G. Somekh and Mark C. Pitter}, year = {2010}, pages = {75700U--75700U-10}, pdf = {http://optics.eee.nottingham.ac.uk/w/images/0/06/CPaper_2010_SPIE_PhotonicsWest_CMOS_Linear_Array_RAL.pdf} }</bibtex>
  
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== Significant Results ==
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<bibtex>
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@inproceedings{smith_canada, title={Parallel detection in picosecond ultrasonics with both commercial and custom array detection},  author={Richard Smith and Mike Somekh and Steve Sharples and Mark Pitter and Roger Light and Nicholas Johnston},  booktitle = {1st International Symposium on Laser Ultrasonics: Science, Technology and Applications}, year = {2008}, url = {http://www.ndt.net/article/laser-ut2008/toc.php}, pdf = {http://optics.eee.nottingham.ac.uk/w/images/6/66/CPaper_2008_LU2008_Montreal_Parallel_Detection_RJS.pdf} }
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</bibtex>
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==Publications==
 

Latest revision as of 10:21, 12 March 2015

Custom CMOS modulated light cameras for parallel detection in picosecond ultrasonics

We have developed a custom CMOS linear array detector for picosecond ultrasound measurements. Performing many measurements in parallel allows us to dramatically reduce the time it takes to perform each measurement.

The signals we are interested in are tiny fluctuations on a large DC background, these types are signals are typically extracted by modulating the signal of interest and using a lock in technique.

The linear array camera we have developed, consists of a line of active pixel sensors, each one has a very large photon capacity to allow it to reach the high signal to noise ratios required to enable us to see the tiny signals present in our experiments. Each pixel has four charge storage areas for capturing four samples during one modulation cycle. Demodulating these samples allows us to measure the amplitude and phase of our signals. The cameras can be locked to a wide range of modulation frequencies.

Ultrafast Camera.PNG Ultrafast Thicknessline.png Ultrafast PaperFig.png

This new detector allows imaging of sample properties, such as coating thickness, over large areas where previously only point measurements were feasible. These camera have allowed us to reduce experiment time by over 30 times compared to the single point detector approach.


Related publications

R J Smith, R A Light, N Johnston, S Sharples, M C Pitter, M G Somekh - Parallel detection in laser ultrasonics
Journal of Physics: Conference Series 214:012006,2010
http://dx.doi.org/10.1088/1742-6596/214/1/012006
Bibtex<div>Author : R J Smith, R A Light, N Johnston, S Sharples, M C Pitter, M G Somekh
Title : Parallel detection in laser ultrasonics
In : Journal of Physics: Conference Series -
Address :
Date : 2010
</div>

Richard J. Smith, Roger A. Light, Steve D. Sharples, Nicholas S. Johnston, Mark C. Pitter, Mike G. Somekh - Multichannel, time-resolved picosecond laser ultrasound imaging and spectroscopy with custom complementary metal-oxide-semiconductor detector
Review of Scientific Instruments 81(2):024901,2010
http://dx.doi.org/10.1063/1.3298606
Bibtex<div>Author : Richard J. Smith, Roger A. Light, Steve D. Sharples, Nicholas S. Johnston, Mark C. Pitter, Mike G. Somekh
Title : Multichannel, time-resolved picosecond laser ultrasound imaging and spectroscopy with custom complementary metal-oxide-semiconductor detector
In : Review of Scientific Instruments -
Address :
Date : 2010
</div>

R J Smith, M G Somekh, S D Sharples, M C Pitter, I Harrison - Parallel detection of low modulation depth signals: application to picosecond ultrasonics
Measurement Science and Technology 19(5):055301,2008
http://dx.doi.org/10.1088/0957-0233/19/5/055301
Bibtex<div>Author : R J Smith, M G Somekh, S D Sharples, M C Pitter, I Harrison
Title : Parallel detection of low modulation depth signals: application to picosecond ultrasonics
In : Measurement Science and Technology -
Address :
Date : 2008
</div>

Roger A. Light, Richard J. Smith, Nicholas S. Johnston, Steve D. Sharples, Michael G. Somekh, Mark C. Pitter - Highly parallel CMOS lock-in optical sensor array for hyperspectral recording in scanned imaging systems
pp. 75700U--75700U-10, San Francisco, California, {USA},2010
http://dx.doi.org/10.1117/12.842083
Bibtex<div>Author : Roger A. Light, Richard J. Smith, Nicholas S. Johnston, Steve D. Sharples, Michael G. Somekh, Mark C. Pitter
Title : Highly parallel CMOS lock-in optical sensor array for hyperspectral recording in scanned imaging systems
In : -
Address : San Francisco, California, {USA}
Date : 2010
</div>

Richard Smith, Mike Somekh, Steve Sharples, Mark Pitter, Roger Light, Nicholas Johnston - Parallel detection in picosecond ultrasonics with both commercial and custom array detection
1st International Symposium on Laser Ultrasonics: Science, Technology and Applications ,2008
http://www.ndt.net/article/laser-ut2008/toc.php
Bibtex
Author : Richard Smith, Mike Somekh, Steve Sharples, Mark Pitter, Roger Light, Nicholas Johnston
Title : Parallel detection in picosecond ultrasonics with both commercial and custom array detection
In : 1st International Symposium on Laser Ultrasonics: Science, Technology and Applications -
Address :
Date : 2008
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