Measuring and testing – Liquid level or depth gauge
Patent
1989-10-03
1991-07-02
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
324643, 364509, G01F 2328
Patent
active
050276557
ABSTRACT:
A method of detecting water level in an elongate cavity comprises emitting an alternating signal into the cavity, varying the frequency of said signal to provide a specific response from the cavity, detecting said response, and comparing said outgoing signal and response. In a preferred embodiment the response is a returning signal reflected from the surface of the water. The frequency of the outgoing signal may be varied continuously to establish a substantially steady state difference frequency between the outgoing and returning signal.
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Geotechnical Instruments (UK) Limited
Yasich Daniel M.
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