Gill Corporate Limited

Oliver Stewart Blacklock

Michael John Gill

Samuel William Birtwell

Robin Bacon

A depth gauge includes an upright elongate support () and several spaced emitters () and spaced detectors () mounted on the elongate support. The emitters () and detectors are electrically connected to a processor that sends signals to the emitters and receives signals from the detectors. In a first aspect, at least two sets of emitters or at least two sets of detectors are mounted on the elongate support. The sets may be directed in different respective directions. In a second aspect, each emitter may emit radiation, and/or each detector may detect radiation, selectively only within a selected range of frequencies, or emit/detect radiation outside the selected range only at a comparatively reduced level. Different emitters may emit radiation, and/or different detectors may detect radiation, only within different ranges of frequencies, or emit/detect radiation outside those ranges only at comparatively reduced levels.

Depth gauge

An ultrasonic flowmeter comprising an elongate duct through which fluid flows when the flowmeter is in use. Ultrasonic transducers are arranged respectively to transmit and receive ultrasonic pulses propagated through such fluid when the flowmeter is in use. Electronic circuitry is connected to the transducers to provide a measure of the time delay between emission of an electronic pulse from one of the transducers and reception of the pulse by the other of the transducers. The circuitry is constructed to enable an output to be provided which is dependent upon that delay and which is indicative of the rate of flow of fluid through the duct. The transducers are located respectively at opposite ends of the duct and are arranged to transmit and receive ultrasonic pulses propagated through the fluid substantially parallel to the duct from one end thereof to the other. The transducers are provided with respective vibratory surfaces which transmit and/or receive ultrasound, which vibratory surfaces have a diameter which exceeds the cross-sectional diameter of the duct.

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Hampshire, United Kingdom

Oliver Stewart Blacklock