Title:
液面位置検出装置
Document Type and Number:
Japanese Patent JP6729141
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a liquid level position detection device that can accurately detect a position of a liquid level without using a temperature sensor, utilizing an ultrasonic wave.SOLUTION: A liquid level detection device 10 is configured to oscillate a piezoelectric element 31 to generate an internal propagation wave W1 propagating inside a propagation body 20, and a surface wave W2 propagating a surface of the propagation body 20. The liquid level detection device 10 is configured to determine a position of a liquid level 81 of a liquid 80 in which the propagation body 20 is immersed in consideration of a temperature of the propagation body 20 affecting a propagation velocity of the internal propagation wave W1 and the surface wave W2 on the basis of a period until the internal propagation wave W1 and the surface wave W2 reflected by an internal propagation wave reflection unit 22 or a surface wave reflection unit 24 are input to the piezoelectric element 31 from the oscillation occurs. The internal propagation wave reflection unit 22 is provided at a position above the propagation body 20 so that the internal propagation wave W1 and the surface wave W2 are not input to the piezoelectric element 31 with the internal propagation wave W1 and the surface wave W2 overlapped.SELECTED DRAWING: Figure 1
Inventors:
Ichimura Masatoshi
Hiroyuki Suzuki
Hiroyuki Suzuki
Application Number:
JP2016149439A
Publication Date:
July 22, 2020
Filing Date:
July 29, 2016
Export Citation:
Assignee:
Nippon Seiki Co., Ltd.
International Classes:
G01F23/296
Domestic Patent References:
| JP2016125825A | ||||
| JP50041578A | ||||
| JP50113259A |
Foreign References:
| US8248888 |
Attorney, Agent or Firm:
Yoichiro Shimoda
Norimasa Shimoda
Katsuhiko Sumiyoshi
Tadanori Masanori
Toshitake Nozaki
Norimasa Shimoda
Katsuhiko Sumiyoshi
Tadanori Masanori
Toshitake Nozaki