Frequency-analysis-type water level measuring method and device therefor

• US 6,053,042 A
• Filed: 09/19/1997
• Issued: 04/25/2000
• Est. Priority Date: 11/20/1996
• Status: Expired due to Term

• Current Assignee: Kepco Engineering & Construction Company Incorporated (Government of South Korea)
• Original Assignee: Korea Power Engineering Company, Inc.
• Inventors: Kim, Hyun-Min, Hwang, Jeong-Ki, Chang, Sang-Gyoon, Lee, Moon-Wook, Jo, Choong-Hee
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): CYGAN, MICHAEL T
• Application Number:
  US08/934,020
• Time in Patent Office: 949 Days
• Field of Search: 73/290 V, 73/1.73, 73/290 B
• US Class Current: 73/290.00V
• CPC Class Codes: G01F 23/296 Acoustic waves
• CPC Class Codes: G01F 23/2966 making use of acoustical resonance or standing waves

Abstract

A method and device of measuring a water level of a frequency analysis type is disclosed. The device is consisted of a pipe type of which immersed length is in a proportion to the water level and which is installed in a container having a fluid, a signal detecting device which has an impact apparatus to provide a source signal periodically or continuously and a impact detecting sensor(s) which gets a response signal of the pipe by the impact apparatus, and a signal analyzer which processes the signal from the impact detecting sensor. The method comprises steps of: generating a source signal to the pipe by the impact apparatus; detecting the response signal of the pipe according the water level by the impact detecting sensor; analyzing the response signal to the frequency response spectra by the signal analyzer; and measuring the water level by comparing to the predetermined frequencies which was obtained by the signal analyzer.

Claims

1. A method of measuring a water level of a frequency analysis type in a device where a pipe type of which immersed length is in a proportion to the water level and which is installed in a container having a fluid, a signal detecting device which has an impact apparatus to provide a source signal periodically or continuously and a impact detecting sensor(s) which gets a response signal of the pipe by the impact apparatus, and a signal analyzer which processes the signal from the impact detecting sensor, said method comprising the steps of:

generating a source signal to the pipe by the impact apparatus;

detecting the response signal of the pipe according the water level by the impact detecting sensor;

analyzing the response signal to the frequency response spectra by the signal analyzer; and

measuring the water level by comparing to the predetermined frequencies which was obtained by the signal analyzer.

2. A device for measuring a water level of a frequency analysis type comprising:

a pipe type of which immersed length is in a proportion to the water level and which is installed in a container having a fluid, a signal detecting device which has an impact apparatus to provide a source signal periodically or continuously and a impact detecting sensor(s) which gets a response signal of the pipe by the impact apparatus, and a signal analyzer which processes the signal from the impact detecting sensor.

3. A device for measuring a water level of a frequency analysis type as claimed in claim 2, wherein a hole for passing a fluid is provided at upper and lower portions of said signal measuring device.

4. A device for measuring a water level of a frequency analysis type as claimed in claim 2, wherein an external pipe 7 of said signal measuring device is installed at the outside of said signal measuring device to secure a stable fluid surface with respect to the movement of a fluid inside a container and connected at least one unit to block a signal occurring from the outside.

5. A device for measuring a water level of a frequency analysis type as claimed in claim 4, wherein a hole for passing a fluid is provided at upper and lower portions of said signal measuring device.