JPS57154027A - Water pressure detector - Google Patents

Water pressure detector

Info

Publication number
JPS57154027A
JPS57154027A JP4117481A JP4117481A JPS57154027A JP S57154027 A JPS57154027 A JP S57154027A JP 4117481 A JP4117481 A JP 4117481A JP 4117481 A JP4117481 A JP 4117481A JP S57154027 A JPS57154027 A JP S57154027A
Authority
JP
Japan
Prior art keywords
vibrator
pasted
water pressure
frequency
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4117481A
Other languages
Japanese (ja)
Inventor
Osamu Kawasaki
Yukihiko Ise
Tetsuji Fukada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4117481A priority Critical patent/JPS57154027A/en
Publication of JPS57154027A publication Critical patent/JPS57154027A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
    • G01L9/0008—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations
    • G01L9/0022—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations of a piezoelectric element

Abstract

PURPOSE:To improve the accuracy with a simple construction by outputting an electrical signal from a vibrator in which a disc-shaped piezo-electric body is pasted on either or both sides at the central part of a circular metal body having a mass larger at the peripheral part than that at the center thereof. CONSTITUTION:A vibration made up of a disc-shaped piezo-electric body 2 pasted at the center of a circular metal body 1 which is made thicker at the peripheral part than that at the central part to increase mass. The vibrator is mounted on the wall surface 4 of the water tank in such a manner that the non pasted surface of the piezo-electric element 2 gets into contact with a liquid such as water. If the water pressure in the water tank 10 changes, the vibrator outputs an voltage corresponding to the force thereof from a terminal 3. The output voltage of the vibrator becomes large in the resonance frequency if the force of the water pressure is the same while almost constant if is small in the frequency enough below the level. Therefore, the vibrator is designed according to the frequency to be detected. This can improve the accuracy with a simple construction.
JP4117481A 1981-03-19 1981-03-19 Water pressure detector Pending JPS57154027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4117481A JPS57154027A (en) 1981-03-19 1981-03-19 Water pressure detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4117481A JPS57154027A (en) 1981-03-19 1981-03-19 Water pressure detector

Publications (1)

Publication Number Publication Date
JPS57154027A true JPS57154027A (en) 1982-09-22

Family

ID=12601057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4117481A Pending JPS57154027A (en) 1981-03-19 1981-03-19 Water pressure detector

Country Status (1)

Country Link
JP (1) JPS57154027A (en)

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