Using different physical methods for demining plastic mines,detection explosives in customs Group Manager: landmines-owner@egroups.com To subscribe, send a...
Dr.A.Hibbs from QM in USA had given the information ,that they can detect 30g RDX and 450g TNT in 2 s scan at 5 cm from flat surface coil.The NQR-detector for ...
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Grechishkin
grechishkin@...
Mar 10, 1999 7:03 pm
... ïÔ: ëÏÍÕ: landmines@egroups.com ôÅÍÁ: Graund Penetrating Radar äÁÔÁ: 3 ÍÁÒÔÁ 1999 Ç. 23:26 GPR works by emitting into the...
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Andy Hibbs
ANDY@...
Mar 10, 1999 7:03 pm
Two factors which are also relevent in mine detection are the coil size and the power used. In our tests we are now using a hand carried coil which weighs...
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Grechishkin
grechishkin@...
Mar 10, 1999 8:06 pm
For 90-pulse in 14N NQR in explosives H1=37 G (RDX) and H1=3*10(-4)*(PQ/vV)(1/2), where P-output power of the transmitter in watts,Q-quality factor of the ...
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Grechishkin
grechishkin@...
Mar 14, 1999 2:47 pm
In RDX at the frequency 5192 kHz at room temperature the relaxation time T2=1.3 ms, asimetry parameter z=0.638 and H1=37 G,for TNT H1=29 G at 888 kHz,z=0.29. ...
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Grechishkin
grechishkin@...
Mar 15, 1999 7:10 am
In 1980,p.71-113,Advances of NQR,edited by J.A.S.Smith we discribed the two-freguency pulse equipment NQR ,which we used in 1975 for first detection NQR in ...
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Grechishkin
grechishkin@...
Mar 15, 1999 6:46 pm
In documents of FAA there is the discussion of CTX-5000 and NQR.We worked in NQR control more that 20 years and can say ,that now only hand bags control by NQR...
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Grechishkin
grechishkin@...
Mar 16, 1999 4:38 am
FAA- certified CTX-5000SP EDS with price 1 million$ in operation in Europe and Israel gives 30 to 50% of all checked bags false alarms.In principal x-ray can...
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Grechishkin
grechishkin@...
Mar 16, 1999 4:10 am
Dr.Hibbs had given the information ,that they were working with H1=1 G.In this case duration of 90-pulse may be 500 microseconds.In 110 litres coil we used ...
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Grechishkin
grechishkin@...
Mar 16, 1999 2:29 pm
The NQR line width was very low ,about 200Hz and H1=1 G is possible to use with duration of pulse 500 microseconds and top-power 0.5 kW in 100 litres coil. But...
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Grechishkin
grechishkin@...
Mar 16, 1999 4:30 pm
t-is the time of accomulation,than t=(nz2vV)/(8j2dQP1*9*10(-8)),where n-number of accomulation,z-number pi,v-NQR frequency,V-volume of coil,j-giromagnetic ...
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Grechishkin
grechishkin@...
Mar 17, 1999 3:41 pm
In 1978-1983 in KSU were made the reports with NQR-technology for mine-detection,post and aviation hand bags control: Number of State registration ...
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Grechishkin
grechishkin@...
Mar 18, 1999 6:50 pm
In Russia we made a similar testing in 1984 ( Izvestija Vuzov,7,58-61,1992) but in our testing the filling fector was much higher.We tested flat surface coils ...
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Grechishkin
grechishkin@...
Mar 19, 1999 4:21 am
The last testing in QM (USA) give nothing new and only are repeting the old testing in Kaliningrad and Novosibirsk.In Russia after the collapse of SU this ...
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Grechishkin
grechishkin@...
Mar 21, 1999 5:30 pm
We think that John Denker is wrong in some parts of his critik NQR. ... eGroup home: http://www.eGroups.com/list/landmines Free Web-based e-mail groups by...
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Grechishkin
grechishkin@...
Mar 25, 1999 9:19 am
Dear Zou Nan! I send you our last tecting in Cina and Australia. rgds VSG ... Grechishkin <grechishkin@...> NQR -landmines detector NQR pulse...
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Grechishkin
grechishkin@...
Mar 25, 1999 4:02 pm
It is well known,that in cross-coils method by Felix Bloch the filling factor is calculated for receiver coil not for exiting.We described the optimal coil for...
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Grechishkin
grechishkin@...
Mar 29, 1999 12:14 pm
In author certificate N265282,1.12.1987 ( Grechishkin V.S.,Rudakov T.N. et al.) we patenred 4 channel NQR device for mine detection in the area.NQR signals ...
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Grechishkin
grechishkin@...
Mar 31, 1999 6:25 pm
... Îò: Franz Fujara <fujara@...> Êîìó: Grechishkin <grechishkin@...> Òåìà: Kosovo Äàòà: 31 ìàðòà 1999 ã....
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Grechishkin
grechishkin@...
Apr 5, 1999 4:22 pm
We started our work in NQR-technology in 1971 and worked with 10 customers. 11 years there was the work with Institute of Applite Physics in Novosibirsk,6...
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Grechishkin
grechishkin@...
Apr 6, 1999 3:11 pm
... ïÔ: Grechishkin <grechishkin@...> ëÏÍÕ: mines@egroups.com ôÅÍÁ: Future of NQR äÁÔÁ: 6 ÁÐÒÅÌÑ 1999 Ç. 18:07 The applications...
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Grechishkin
grechishkin@...
Apr 7, 1999 9:05 pm
InVision made more than 100 devicies CTX-5000 for computer tomography x-ray and sold in 24 countries with the price 1 million $ for detection of ...
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Grechishkin
grechishkin@...
Apr 11, 1999 4:44 pm
We are more optimistic about NQR mine detection than we were a few years ago. It is demonstrated that detection of even reasonably small quantities of TNT is...
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Grechishkin
grechishkin@...
Apr 11, 1999 8:33 pm
... Îò: Susan Cagle <SUSAN@...> Êîìó: grechishkin@... Òåìà: Papers from Dr. Hibbs Äàòà: 17 ìàðòà 1999 ã. 19:52 Dr....
... Îò: James Colton <jcolton@...> Êîìó: Grechishkin <grechishkin@...> Òåìà: RE: [analysisexplosives] Fw: minimal mass Äàòà:...
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Grechishkin
grechishkin@...
Apr 13, 1999 7:53 pm
In stochastic exitation the rf power is decreased by a factor of 1000 compared to pulsed exitation,the deadtime can be reduced.But in NQR it is impossible to...
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Grechishkin
grechishkin@...
Apr 15, 1999 6:16 pm
In Uspekhi Fiz.Nauk,69,189-216,1959 we described stochstic NQR detector with very low power.This principal one may use for T1 about 1 s like in TNT.But in this...
