CN102023038A - Ultrasonic measurement method for pipeline flux - Google Patents

Abstract

The invention discloses an ultrasonic measurement method for pipeline flux. The measurement method comprises the following steps of: controlling a blockage mechanism (2) to be in a non-blockage state and measuring the time from when a transducer (1) emits an ultrasonic wave to when the transducer (1) receives the ultrasonic wave after the ultrasonic wave is reflected through the blockage mechanism (2); and controlling the blockage mechanism (2) to be in a blockage state and measuring the time from when the transducer (1) emits an ultrasonic wave to when the transducer (1) receives the ultrasonic wave after the ultrasonic wave is reflected through the blockage mechanism (2) so as to compute the flux in a pipeline according to a propagation velocity of the ultrasonic wave, the distance between the transducer (1) and a reflection end face of the blockage mechanism (2) and an inside diameter of the pipeline (3). In the ultrasonic measurement method, only one transducer is used to measure the pipeline flux, so that the measurement operation is easy, the cost is reduced and the precision and the accuracy of the measurement are improved.

Description

A kind of ultrasonic wave measuring method of pipeline flow

Technical field

The present invention relates to the ultrasonic investigation method of a kind of flow rate testing methods, particularly a kind of pipeline flow.

Background technology

Ultrasonic flow meter is widely used in each field, has obtained development fast along with the application of ultrasonic technology is more and more ripe! Yet the ultrasonic flow meter of Ying Yonging all adopts two transducers to come measurement of discharge in the market, because the limitation of transducer fabrication process causes two differences between the transducer, finally causes the error of flow rate test bigger.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of ultrasonic investigation method of pipeline flow.This method is only come test traffic with a transducer, and the ultrasonic investigation flow is become simply, also can improve the precision of test simultaneously.

For solving the problems of the technologies described above technical scheme of the present invention: a kind of ultrasonic investigation method of pipeline flow.This method adopts a transducer and the stifled mechanism of flowing to measure flow, and during test, at first the stifled stream of control mechanism is in non-stifled stream mode, and test receives hyperacoustic time t from transducers transmit ultrasonic waves transducer after blocking up the reflection of stream mechanism ₁The stifled stream of control mechanism is in stifled stream mode then, and test receives hyperacoustic time t from transducers transmit ultrasonic waves transducer after blocking up the reflection of stream mechanism ₂Can calculate flow q in the pipeline according to hyperacoustic velocity of propagation c and transducer to the distance L of the reflection end face that blocks up stream mechanism and the inner diameter d of pipeline, its computing formula is:

Wherein

Δ t=t ₁-t ₂, π=3.14, v is the flowing velocity of pipeline internal medium.

In the ultrasonic investigation method of above-mentioned pipeline flow, described transducer is the two ends that are mounted respectively at pipeline with blocking up stream mechanism.

Beneficial effect of the present invention: compared with prior art, the present invention only comes testing conduit flow flow with a transducer, not only make the ultrasonic investigation flow become simply, reduce cost, and overcome the error problems of too that exists when two transducers of available technology adopting are tested, improved the precision and the accuracy of test.

Description of drawings

Fig. 1 is a test process synoptic diagram of the present invention.

The present invention is further illustrated below in conjunction with the drawings and specific embodiments.

Embodiment

Embodiment 1.As shown in Figure 1, flow is measured by transducer 1 of its employing and the stifled mechanism 2 of flowing, and transducer 1 flows the two ends that mechanism 2 is placed on pipeline 3 respectively with blocking up.Transducer 1 also claims active sensor, but is mainly used in the inverse conversion that realizes electric energy and acoustic energy.During test, at first the stifled stream of control mechanism 2 is in non-stifled stream mode, and test receives hyperacoustic time t from transducer 1 emission ultrasound wave transducer 1 after stifled stream mechanism 2 reflects ₁The stifled stream of control mechanism 2 is in stifled stream mode then, and test receives hyperacoustic time t from transducer 1 emission ultrasound wave transducer 1 after stifled stream mechanism 2 reflects ₂Suppose that hyperacoustic velocity of propagation is c, the flowing velocity of pipeline internal medium is v, and transducer 1 is that the electroacoustic conversion of transducer 1 and the delay of acoustic-electric conversion are τ (affected by environment), then exist to the stifled distance that flows the reflection end face of mechanism 2:

A) the stifled mechanism of flowing is under the non-stifled stream situation, $t_1=\frac{L}{c-v}+\frac{L}{c+v}+\mathrm{\τ}---\left(1\right)$

B) the stifled mechanism of flowing is under the stifled stream situation (2)

(1)-(2) formula obtains:

Thereby obtain

Can calculate flow q in the pipeline according to hyperacoustic velocity of propagation c and transducer 1 to the distance L of the reflection end face that blocks up stream mechanism 2 and the inner diameter d of pipeline 3, its computing formula is:

Wherein

Δ t=t ₁-t ₂, π=3.14, v is the flowing velocity of pipeline internal medium.

Embodiments of the present invention are not limited to the foregoing description, and the various variations of making under the prerequisite that does not break away from aim of the present invention all belong within protection scope of the present invention.

Claims (2)

1. the ultrasonic investigation method of a pipeline flow, it adopts a transducer (1) and a stifled stream mechanism (2) to measure flow, it is characterized in that: during test, at first control stifled stream mechanism (2) is in non-stifled stream mode, and test receives hyperacoustic time t from transducer (1) emission ultrasound wave transducer (1) after stifled stream mechanism (2) reflection ₁Control stifled stream mechanism (2) is in stifled stream mode then, and test receives hyperacoustic time t from transducer (1) emission ultrasound wave transducer (1) after stifled stream mechanism (2) reflection ₂Can calculate flow q in the pipeline according to hyperacoustic velocity of propagation c and transducer (1) to the distance L of the reflection end face of stifled stream mechanism (2) and the inner diameter d of pipeline (3), its computing formula is:

Wherein

Δ t=t ₁-t ₂, π=3.14, v is the flowing velocity of pipeline internal medium.

2. the ultrasonic investigation method of pipeline flow according to claim 1 is characterized in that: described transducer (1) and stifled stream mechanism (2) are mounted respectively the two ends in pipeline (3).