JPS61132717U

JPS61132717U -

Info

Publication number: JPS61132717U
Application number: JP1528185U
Authority: JP
Priority date: 1985-02-07
Filing date: 1985-02-07
Publication date: 1986-08-19

Description

[Brief explanation of the drawing]

第１図はこの考案の実施例を示すブロツク図、
第２図は上記実施例の遅延回路の回路図、第３図
は上記実施例の位相比較器の入出力電圧の波形図
、第４図は従来の渦流量計のブロツク図、第５図
は従来の位相比較器の入出力電圧の波形図である
。１……管路、２……渦発生体、３……カルマン
渦列、４ａ……超音波送波器、４ｂ……超音波受
波器、５……発信器、６，８……整形回路、７…
…増巾器、９……位相比較器、１０……ローパス
フイルタ、１１……平滑回路、１２ａ，１２ｂ…
…電圧比較器、１３ａ，１３ｂ……遅延回路。 Figure 1 is a block diagram showing an embodiment of this invention.
Fig. 2 is a circuit diagram of the delay circuit of the above embodiment, Fig. 3 is a waveform diagram of the input/output voltage of the phase comparator of the above embodiment, Fig. 4 is a block diagram of a conventional vortex flowmeter, and Fig. 5 is a diagram of the input/output voltage of the phase comparator of the above embodiment. FIG. 2 is a waveform diagram of input and output voltages of a conventional phase comparator. 1... Pipeline, 2... Vortex generator, 3... Karman vortex street, 4a... Ultrasonic wave transmitter, 4b... Ultrasonic receiver, 5... Transmitter, 6, 8... Shaping Circuit, 7...
...Amplifier, 9...Phase comparator, 10...Low pass filter, 11...Smoothing circuit, 12a, 12b...
...Voltage comparator, 13a, 13b...Delay circuit.

Claims

[Scope of utility model registration request]

In a vortex flowmeter that measures the flow rate by detecting the number of Karman vortices generated by a vortex generator placed in a fluid using phase modulation of an ultrasonic beam, the downstream side of the vortex generator inserted into the fluid A pair of ultrasonic transmitter/receivers are provided facing each other with a flow path in between, an oscillator that excites the ultrasonic transmitter, and a phase difference between the outputs of the oscillator and the ultrasonic receiver. a two-stage delay circuit that delays the phase of the output of the oscillator by a predetermined amount in accordance with the phase of the output of the ultrasound receiver; a phase comparator that compares the phase of the output of the delay circuit with the phase of the output of the ultrasonic receiver; A smoothing circuit smoothes the output of the comparator, and the output voltage of the smoothing circuit is compared with a predetermined voltage corresponding to a predetermined phase difference between the outputs of the oscillator and the ultrasonic receiver, and based on the output Above 2
A vortex flowmeter comprising two voltage comparators that respectively control delay operations of delay circuits in stages.