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03/20/2009 01:17:39 PM · #1 |
Was trying to find info on a old television lens I have and came across this article...pretty neat stuff....
//scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=RSINAK000073000012004326000001&idtype=cvips&gifs=yes
"Grant Thomson and David Batchelder"
Molecular Physics and Instrumentation Group, Department of Physics and Astronomy, University of Leeds, Woodhouse Lane, LS2 9JT, United Kingdom
The design of a forensic-lidar is reported, enabling a single operator to perform the spectral identification of a labeled object at 5 m distance using a compact, hand-held instrument, low-power excitation (1 mW) and short sampling times (under 2 s) from a sample less than 100-µm thick. The system integrates a modified single-lens-reflex (SLR) telephoto camera with an optical-fiber coupled Raman probe head. Spectral analysis was achieved using an optical-fiber coupled spectrograph employing a volume-phase holographic grating, charge coupled device array detection and visible excitation. Thus, spectra may be acquired from objects encased in transparent packaging or behind glass windows. The use of a modified SLR camera enables accurate sample alignment using the visible spectrum and collection of surface-enhanced resonance Raman scattered flux through the SLR camera lens using epi-illumination. A single operator may acquire fingerprint recognition of a material using a single hand-held unit and spectrum-matching software. The instrument design is reported with preliminary performance such as spectrograph resolution and transmission. A preliminary spectrum is presented at a standoff distance of 5 m. ©2002 American Institute of Physics.
History: Received 4 June 2002; accepted 23 August 2002
Permalink: //link.aip.org/link/?RSINAK/73/4326/1 |
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03/20/2009 01:27:31 PM · #2 |
Originally posted by Article:
The design of a forensic-lidar is reported, enabling a single operator to perform the spectral identification of a labeled object at 5 m distance using a compact, hand-held instrument, low-power excitation (1 mW) and short sampling times (under 2 s) from a sample less than 100-µm thick. The system integrates a modified single-lens-reflex (SLR) telephoto camera with an optical-fiber coupled Raman probe head. Spectral analysis was achieved using an optical-fiber coupled spectrograph employing a volume-phase holographic grating, charge coupled device array detection and visible excitation. Thus, spectra may be acquired from objects encased in transparent packaging or behind glass windows. The use of a modified SLR camera enables accurate sample alignment using the visible spectrum and collection of surface-enhanced resonance Raman scattered flux through the SLR camera lens using epi-illumination. A single operator may acquire fingerprint recognition of a material using a single hand-held unit and spectrum-matching software. The instrument design is reported with preliminary performance such as spectrograph resolution and transmission. A preliminary spectrum is presented at a standoff distance of 5 m. ©2002 American Institute of Physics.
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I concur. |
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03/20/2009 02:09:10 PM · #3 |
The mention of the Lidar causes me to speculate that these people are talking about a high-tech way of using dSLR gear to target salmon and trout more effectively. Mention of a transparent medium reinforces this perception. It's a new tool for fishermen with too much money, dude...
R.
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