Symposium on the Application of Geophysics to Engineering and Environmental Problems 1995, 1995
This paper discusses methods of location and identi cation of compact metallic and ferrous object... more This paper discusses methods of location and identi cation of compact metallic and ferrous objects using magnetometers and electromagnetic pulse induction. To date, no commercially available systems exist which can explicitly and accurately estimate the location of a compact ferrous or metallic object and identify it reliably. Self-contained systems which could do so in real-time would represent a signi cant advance in the state-of-the-art.
Standoff sensing performed in real time by exploiting the spectral properties of bioaerosols faci... more Standoff sensing performed in real time by exploiting the spectral properties of bioaerosols facilitates classification of detected materials.
A novel method to determine the parameters (dipole moment, orientation, and lacation) of a magnet... more A novel method to determine the parameters (dipole moment, orientation, and lacation) of a magnetic dipole is discussed. The method, which requires no a priori knowledge of the parameters, consists of meamring one or more components of the magnetic field of the dipole in a two-dimensional grid and performing a two-dimensional multiparameter nonlinear least squares fit to the data.
An automated system which measures, coherently averages, and stores time domain electromagnetic i... more An automated system which measures, coherently averages, and stores time domain electromagnetic induction responses of conductive objects and allows on-line analysis of the data is described. The sensor portion of the system consists of a set of coils, transmit and receive circuitry situated in a remote nonmetallic laboratory. The circuitry is controlled by a specialized high-speed data-acquisition system which communicates, through a microcomputer, with a distant mainframe computer. Advanced inductive load switching techniques are employed and errors due to temperature variations in the coils are minimized by suitable sensor design. The user can change date-collection parameters, such as pulse length, dwell time, and transmitter waveform shape, under program control to tailor the system to a particular application. The design also allows for easy replacement of the sensor elements; i.e., coils, receive and transmit circuitry as different applications require. This flexibility allows the system to be readily adapted for research in a number of areas that rely on measurement of electromagnetic induction responses. A typical response may be obtained in less than 1 min. The minimum time resolution of the system is 4 μs. Noise levels of 3 to 5 mV standard deviation are obtainable for 500 averages. Data are presented to demonstrate the capabilities of the system.
This paper discusses methods of location and identi cation of compact metallic and ferrous object... more This paper discusses methods of location and identi cation of compact metallic and ferrous objects using magnetometers and electromagnetic pulse induction. To date, no commercially available systems exist which can explicitly and accurately estimate the location of a compact ferrous or metallic object and identify it reliably. Self-contained systems which could do so in real-time would represent a signi cant advance in the state-of-the-art.
mRhTOsAEiT Approved for public r.1.auj DEFENCE RESEARCH ESTABLISHMENT SUFFIELD, RALSTON, ALBERTA ... more mRhTOsAEiT Approved for public r.1.auj DEFENCE RESEARCH ESTABLISHMENT SUFFIELD, RALSTON, ALBERTA WARN NG PER~eOtp me I ______W Canadg 91 4 _09 1 02 I I N..CIhASS I'S k) RALISTO)N, A1I13IIKI'A StIffield HRport No. 5-18 ADVANCES IN '[Il LOCATION AN!I) ID)ENTIFICATION O1F Ill I)DEN EIXPLOSIVE MIULNITIONS (U) by Jo! HI F. N ic Ice an d 'hogadl ililh Da~s IDece iher 3. 1990 KWARN I NG of t h ~i nforry tion .,I eritted MIj-t to re -,nhno of proprietory .,., 1,,ten rightn 91 4 09 102 VNC LASS I I' l)
Symposium on the Application of Geophysics to Engineering and Environmental Problems 1995, 1995
This paper discusses methods of location and identi cation of compact metallic and ferrous object... more This paper discusses methods of location and identi cation of compact metallic and ferrous objects using magnetometers and electromagnetic pulse induction. To date, no commercially available systems exist which can explicitly and accurately estimate the location of a compact ferrous or metallic object and identify it reliably. Self-contained systems which could do so in real-time would represent a signi cant advance in the state-of-the-art.
Standoff sensing performed in real time by exploiting the spectral properties of bioaerosols faci... more Standoff sensing performed in real time by exploiting the spectral properties of bioaerosols facilitates classification of detected materials.
A novel method to determine the parameters (dipole moment, orientation, and lacation) of a magnet... more A novel method to determine the parameters (dipole moment, orientation, and lacation) of a magnetic dipole is discussed. The method, which requires no a priori knowledge of the parameters, consists of meamring one or more components of the magnetic field of the dipole in a two-dimensional grid and performing a two-dimensional multiparameter nonlinear least squares fit to the data.
An automated system which measures, coherently averages, and stores time domain electromagnetic i... more An automated system which measures, coherently averages, and stores time domain electromagnetic induction responses of conductive objects and allows on-line analysis of the data is described. The sensor portion of the system consists of a set of coils, transmit and receive circuitry situated in a remote nonmetallic laboratory. The circuitry is controlled by a specialized high-speed data-acquisition system which communicates, through a microcomputer, with a distant mainframe computer. Advanced inductive load switching techniques are employed and errors due to temperature variations in the coils are minimized by suitable sensor design. The user can change date-collection parameters, such as pulse length, dwell time, and transmitter waveform shape, under program control to tailor the system to a particular application. The design also allows for easy replacement of the sensor elements; i.e., coils, receive and transmit circuitry as different applications require. This flexibility allows the system to be readily adapted for research in a number of areas that rely on measurement of electromagnetic induction responses. A typical response may be obtained in less than 1 min. The minimum time resolution of the system is 4 μs. Noise levels of 3 to 5 mV standard deviation are obtainable for 500 averages. Data are presented to demonstrate the capabilities of the system.
This paper discusses methods of location and identi cation of compact metallic and ferrous object... more This paper discusses methods of location and identi cation of compact metallic and ferrous objects using magnetometers and electromagnetic pulse induction. To date, no commercially available systems exist which can explicitly and accurately estimate the location of a compact ferrous or metallic object and identify it reliably. Self-contained systems which could do so in real-time would represent a signi cant advance in the state-of-the-art.
mRhTOsAEiT Approved for public r.1.auj DEFENCE RESEARCH ESTABLISHMENT SUFFIELD, RALSTON, ALBERTA ... more mRhTOsAEiT Approved for public r.1.auj DEFENCE RESEARCH ESTABLISHMENT SUFFIELD, RALSTON, ALBERTA WARN NG PER~eOtp me I ______W Canadg 91 4 _09 1 02 I I N..CIhASS I'S k) RALISTO)N, A1I13IIKI'A StIffield HRport No. 5-18 ADVANCES IN '[Il LOCATION AN!I) ID)ENTIFICATION O1F Ill I)DEN EIXPLOSIVE MIULNITIONS (U) by Jo! HI F. N ic Ice an d 'hogadl ililh Da~s IDece iher 3. 1990 KWARN I NG of t h ~i nforry tion .,I eritted MIj-t to re -,nhno of proprietory .,., 1,,ten rightn 91 4 09 102 VNC LASS I I' l)
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