Title:
LIQUID LEVEL POSITION DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/167660
Kind Code:
A1
Abstract:
Provided is a liquid level position detection device having good precision of liquid level position detection. A liquid level position detection device is provided with a propagation body 10 in which the ratio of a portion thereof that is immersed in a liquid varies according to the liquid level position, a first transmitting/receiving part 21, a second transmitting/receiving part 22, and a detection part for detecting the liquid level position on the basis of the propagation time of a first surface wave W1 and/or a second surface wave W2. The propagation body 10 has a bottom surface part 16 which connects a main surface part 11 and a main surface part 12 and forms a curved surface shape in side view. The first transmitting/receiving part 21 generates a first surface wave W1 propagated through the main surface part 11, and the second transmitting/receiving part 22 receives the first surface wave W1 propagated through the bottom surface part 16 and the main surface part 12 via the main surface part 11. The second transmitting/receiving part 22 generates a second surface wave W2 propagated through the main surface part 12, and the first transmitting/receiving part 21 receives the second surface wave W2 propagated through the bottom surface part 16 and the main surface part 11 via the main surface part 12.
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Inventors:
KONAKAWA EMII
WATANABE MASAHIRO
WATANABE MASAHIRO
Application Number:
PCT/JP2019/005488
Publication Date:
September 06, 2019
Filing Date:
February 15, 2019
Export Citation:
Assignee:
NIPPON SEIKI CO LTD (JP)
International Classes:
G01F23/296
Domestic Patent References:
| WO1990010849A1 | 1990-09-20 |
Foreign References:
| US4920796A | 1990-05-01 | |||
| US4213337A | 1980-07-22 | |||
| JP2004028592A | 2004-01-29 | |||
| JP2004117301A | 2004-04-15 |
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