CHARACTERISTIC FREQUENCY MEASURING EQUIPMENT AND TENSIOMETER USING SUCH EQUIPMENT

Title:

CHARACTERISTIC FREQUENCY MEASURING EQUIPMENT AND TENSIOMETER USING SUCH EQUIPMENT

Document Type and Number:

WIPO Patent Application WO/1993/020415

Kind Code:

A1

Abstract:

The vibration of a belt or the like detected by a microphone is shaped into rectangular waveforms. The period of each cycle of waveform is held by a latch (8) and sequentially stored in a period memory (12). In a cycle comparison unit (14), waveforms in an expected allowable range of variations are extracted by comparison with the fiducial period. The series of the extracted waveforms are stored in a memory (16). A selection unit (18) selects a representative value from the series of extracted waveforms. A frequency calculating unit (19) calculates the frequency in accordance wit the representative value. A tension calculating unit (20) assigns the calculated frequency (characteristic frequency) to a given formula to work out the tension of the belt or the like. It may be possible to calculate the frequency directly from the latched period and then execute the processes to follow.

Inventors:

KAWACHI KIYOSHI (JP)

Application Number:

PCT/JP1993/000447

Publication Date:

October 14, 1993

Filing Date:

April 07, 1993

Export Citation:

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Assignee:

UNITTA CO LTD (JP)
KAWACHI KENKYUSHO CO LTD (JP)
KAWACHI KIYOSHI (JP)

International Classes:

G01H13/00; G01H17/00; G01L5/04; G01L5/10; (IPC1-7): G01H13/00; G01H3/08; G01M7/00; G01N3/30; G01N3/34

Foreign References:

JPH0419524A	1992-01-23
JPS60211326A	1985-10-23

Other References: