British Technology Group Limited

National Research Development Corporation

Btg International Limited

Darenth Equipment, Ltd.

John Alec Smith

Julian D Shaw

Michael David Rowe

Martin Blanz

Simon Peter Beevor

Barry E Jones

Apparatus for Nuclear Quadrupole Resonance testing a remote sample containing a given species of quadrupolar nucleus includes at least one probe (112) having a given maximum cross-sectional dimension; a device (102) for applying excitation to the probe or at least one of the probes to excite nuclear quadruple resonance for a selected range of distance of the sample from each such probe, the selected range being at least one tenth of the given maximum dimension of the probe, the apparatus being adapted to produce a non-uniform field over the selected range; and a device (106) for detecting the resonance response signal from the sample via the probe or at least one of the probes; the excitation being such as would generate non-zero resonance signals at all distances within the selected range.

Apparatus for and method of nuclear quadrupole resonance testing of a

A method and apparatus for imaging within a sample space an object containing quadrupolar nuclei comprises irradiating the object to excite nuclear quadrupole resonance, applying to the object a magnetic field gradient having a profile Bo(x) such that the square of the profile (Bo(x))2 varies linearly with distance (x), detecting resonance response signals from the nuclei, and deriving an image from the response signals. A method of and apparatus for nuclear quadrupole resonance testing an object, and a method of and apparatus for detecting the presence of a particular substance containing a given species of quadrupolar nucleus, are also disclosed.

Methods and apparatus for NQR testing

A method of Nuclear Quadrupole Resonance testing a sample containing a given species of quadrupolar nucleus, the sample being subjected to an inhomogeneous distribution of an extrinsic parameter having a variation over the sample over a particular range, comprises applying excitation to the sample at a plurality of different excitation frequencies to excite nuclear quadrupole resonance, such frequencies falling within the resonance frequency range for the nucleus corresponding to the range of the extrinsic parameter, and detecting the resonance response signal.

Method of nuclear quadrupole resonance testing and method of configuring

Apparatus for and method of nuclear resonance testing

Method of and apparatus for NQR testing selected nuclei with reduced

Methods and apparatus for detecting substances containing nuclei of a

Method of nuclear quadrupole resonance testing of integral spin quantum

The detection of compounds containing both nuclei of a kind which exhibit nuclear magnetic resonance (nmr) and nuclei of a kind which exhibit nuclear quadrupole resonance (nqr), for example compounds containing both .sup.1 H and .sup.14 N nuclei, is carried out by subjecting a substance suspected of containing such a compound to a magnetic field and repetitively to three parallel activities A,H and B. Activity A comprises two similar rf pulse sequences P.sub.A and P.sub.B at the nmr frequency. Activity H is a temporary change in the value of the magnetic field, which may be a reduction to zero. Activity B is the application of additional rf signals. Activity H and/or activity B are different during each of the respective pulse sequences P.sub.A and P.sub.B. The activity B rf signals are at one or more frequencies selected so that in combination with the activity H in at least one of the pulse sequences the subsequent nmr signal is modified if such a compound is present. The difference in magnitude of the nmr signals obtained following the two types of rf pulse sequence is then measured.

Methods and apparatus for detecting certain compounds

Apparatus for dispensing a desired quantity by weight of a fluid material such as a liquid color printing ink for shade mixing purposes includes a container (1) for the fluid material to be dispensed, a main fluid material dispensing discharge outlet (2) on the container (1) and a secondary fluid material dispensing discharge outlet (3) on the container (1). The container further includes a movable pressure assembly plate to apply a pressure to the fluid to dispense the fluid from the discharge outlets. The secondary dispensing dischage outlet (3) incorporates a gear pump (5) which is adjustably operable to dispense a particular volume of fluid material corresponding to a particular weight of fluid material to be dispensed. The pressure plate assembly (4) includes a presser plate (21) slidably movable in the container (1) in sealed contact with side walls (1a) of the container (1) to engage directly or indirectly the upper surface of fluid material in the container (1). A piston and cylinder assembly (23) is operative to urge the plate (21) towards and away from fluid material in the container (1).

Fluid dispensing apparatus and method of operation thereof

A passive transponder, particularly for dental or medical applications, is described in which signals received by one or more receive resonant circuits are changed in frequency either up or down by a non-linear device coupled to one or more transmit resonant circuits. Each transmit resonant circuit includes a transducer whose impedance depends on a quantity whose value is to be transmitted and thus the frequency of signals received from the transponder depends on the value of the quantity.

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London, United Kingdom

John Alec Smith