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sciguy
26th January 2007 - 06:02 PM
http://www.physorg.com/news88872965.html

First of all NQR for explosives detection has been researched for 30 years and two companies have products: GE & QR Sciences. Secondly, squid pre-amps have been looked at and rejected as useful. Noise figures for room temperature amps (1 db or so in the appropriate bandwidth) are plenty good considering most of the SNR problems is from RFI and materials within the antenna range ringing. The cost, complexity, and lack of robustness of implementing HTS squid preamps for an at-best marginal increase in SNR makes the system are not viable.
erKa
27th January 2007 - 07:50 PM
QUOTE (sciguy+Jan 26 2007, 06:02 PM)
http://www.physorg.com/news88872965.html

First of all NQR for explosives detection has been researched for 30 years and two companies have products: GE & QR Sciences. Secondly, squid pre-amps have been looked at and rejected as useful. Noise figures for room temperature amps (1 db or so in the appropriate bandwidth) are plenty good considering most of the SNR problems is from RFI and materials within the antenna range ringing. The cost, complexity, and lack of robustness of implementing HTS squid preamps for an at-best marginal increase in SNR makes the system are not viable.

Too many acronyms for me. What's the matter? it seems to be a new jap bike fulfilled of exciting new high-tech gadgets.
kaneda
1st February 2007 - 07:06 AM
Back in 1986 I remember customs men using sniffers on our luggage at Narita airport (Tokyo).

The latest brings to mind the sight of several customs men, blackened and smoking and standing around the remains of a piece of luggage with one of them admitting that there was definitely an explosive substance in that case.
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