CN202631065U - Transmission time calibration system for time difference method ultrasonic flowmeter - Google Patents
Transmission time calibration system for time difference method ultrasonic flowmeter Download PDFInfo
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- CN202631065U CN202631065U CN 201220268472 CN201220268472U CN202631065U CN 202631065 U CN202631065 U CN 202631065U CN 201220268472 CN201220268472 CN 201220268472 CN 201220268472 U CN201220268472 U CN 201220268472U CN 202631065 U CN202631065 U CN 202631065U
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Abstract
The utility model discloses a transmission time calibration system for a time difference method ultrasonic flowmeter. The time difference method ultrasonic flowmeter comprises a circulation channel, wherein liquid is filled in the circulation channel; and the transmission time calibration system comprises an ultrasonic transmitter, an upstream sensor, a downstream sensor, an analog switch circuit, an automatic gain amplifier, a first comparator and a timer; the ultrasonic transmitter and the first comparator are connected with the timer; the ultrasonic transmitter is simultaneously connected with the upstream sensor and the downstream sensor at the same time; the upstream sensor and the downstream sensor are connected through ultrasonic waves; the upstream sensor and the downstream sensor are simultaneously connected with the analog switch circuit; the analog switch circuit is connected with the automatic gain amplifier; and the automatic gain amplifier is connected with the first comparator. The transmission time of the ultrasonic waves in the circulation channel is measured and calibrated through the timer, the time difference method ultrasonic flowmeter can accurately measure the flow velocity and flow of the fluid, and the system is simple in structure and easy to implement.
Description
Technical field
The utility model relates to a kind of technology that improves the transit-time ultrasonic flow meter measuring accuracy, refers in particular to a kind of transmission time calibration system of transit time ultrasonic flow meters.
Background technology
Transit time ultrasonic flow meters is a kind of flow measurement instrument of movement-less part, and it is not provided with any barrier member in circulation passage, the no pressure loss; Can do non-contact measurement; Can measure liquid, be a kind of replenishing to the electromagnetic flowmeter that does not have the measurement of obstructing; Except that band measuring tube segmentation, the stream verification of generally need not putting into effect; Especially outstanding advantage is being arranged aspect the heavy caliber flow measurement, it is to develop one of one type of flowmeter rapidly in recent years.Therefore the information of flow rate of liquid on just carrying when ultrasound wave is propagated in flowing liquid just can detect the flow velocity of liquid through the travel-time of calculating concurrent-countercurrent ultrasonic waves transmitted signal, thereby be converted into flow.The flow velocity computing formula is:
Wherein v is a flow velocity, and D is an internal diameter of the pipeline, T
SuitableAnd T
ContraryBe respectively the ultrasound wave concurrent-countercurrent travel-time, θ is the angle of travel path and flow direction.
In the time detecting process, the piezoelectricity pulse that control is sent must guarantee very high temporal resolution with the measuring transducer of handling the reception signal.Detection method has experienced the stages such as complicated digital signal processing that zero crossing detection, measurement of correlation analysis and antijamming capability and measuring accuracy are greatly improved.Because ultrasound wave has decay in various degree under the different bore situation, therefore through after the made of hardware circuits which process, first pulse signal even a plurality of pulse signal that ultrasonic signal can not the full backup emission, this will cause erroneous judgement, T
SuitableAnd T
ContraryActual measured value comprised time of one or more recurrence intervals of losing, the measuring error that causes according to the bore difference can reach 5%.Chinese patent publication number CN101446505A; Open day on June 3rd, 2009; Name is called in the Chinese invention patent of " system for calibrating ultrasonic flowmeter by time difference method " and discloses a kind of system for calibrating ultrasonic flowmeter by time difference method; The pipeline of system comprises small-bore pipeline and large diameter pipeline, and the axial two ends of described small-bore pipeline comprise probe, has certain angle between small-bore pipeline and the large diameter pipeline.This invention is calibrated the ultrasonic flow meter that is equal under the large diameter pipeline through small-bore pipeline, has improved the progress of assay calibration, degree of stability and usable range, but this invention does not solve the bigger problem of travel-time error equally, and structure is comparatively complicated.
The utility model content
The purpose of the utility model is to overcome to calculate in the prior art to measure the bigger defective of hyperacoustic travel-time error in the flow rate of liquid process, and a kind of transmission time calibration system of measuring the less transit time ultrasonic flow meters of hyperacoustic travel-time error is provided.
The purpose of the utility model is to be achieved through following technical proposals:
A kind of transmission time calibration system of transit time ultrasonic flow meters; Transit time ultrasonic flow meters comprises circulation passage; Be provided with liquid in the circulation passage; The transmission time calibration system comprises ultrasonic transmitter, be arranged on the circulation passage upper reaches be used to send and the upstream sensor of received ultrasonic signal, be arranged on the circulation passage downstream be used to send and downstream sensor, analog switching circuit, the automatic gain amplifier of received ultrasonic signal, be used for first comparer of zero passage sampling and have the initial pulse-losing quantity of calculating being used for calibrating the timer in transmission time; Ultrasonic transmitter all links to each other with timer with first comparer; Ultrasonic transmitter connects upstream sensor and downstream sensor simultaneously, links to each other through ultrasound wave between upstream sensor and downstream sensor, and upstream sensor is connected analog switching circuit simultaneously with downstream sensor; Analog switching circuit connects automatic gain amplifier, and automatic gain amplifier connects first comparer.When ultrasonic transmitter sent ultrasonic signal, timer picked up counting; When measuring the travel-time of following current, send ultrasonic signal through upstream sensor and be sent to downstream sensor, when measuring the travel-time of adverse current, send ultrasonic signal through upstream sensor and be sent to downstream sensor; Final timer is accomplished clocking capability after receiving the electric signal of first comparer, and this section period is hyperacoustic travel-time.Simultaneously, timer can calculate upstream sensor or downstream sensor receives the umber of pulse of losing before the signal for the first time, and its detailed process is following:
1, with normal transmission frequency emission ultrasonic signal, the mistiming that obtains between the adjacent reception signal through timer after the signal Processing is a hyperacoustic cycle, and keeps a record;
2, ultrasonic transmitter gets into the frequency conversion emission, and and then the ultrasonic signal of several normal frequencies of emission is launched at least one again and be different from the ultrasonic signal of frequency before earlier;
3; Upstream sensor or downstream sensor receive the ultrasonic signal through liquid, handle the mistiming between the adjacent reception signal when obtaining the frequency conversion emission, when detecting the mistiming of departing from normal condition; Just can conclude that this is the starting point of the frequency variation signal that receives; Transmitting from ultrasonic transmitter is zero-time, and the starting point that receives frequency variation signal is the termination time, is designated as Tx during this period of time;
4, in the cycle of the travel-time that the time of Tx comprises ultrasonic signal and the ultrasonic signal of several normal frequencies, can learn that thus travel-time T0 is the time in the cycle of the Tx ultrasonic signal that deducts several normal frequencies;
5, first burst length that T0 and timer is received imperfect signal compares, and can extrapolate the front has several pulse missings;
6, the detected T of timer in real process
SuitableAnd T
ContraryTime of several pulse missings of obtaining before deducting of time just be real T
SuitableAnd T
ContraryTime.
As a kind of preferred version; Also be provided with BPF. and secondary operational amplifier between the automatic gain amplifier and first comparer; Automatic gain amplifier connecting band bandpass filter, BPF. connects the secondary operational amplifier, and the secondary operational amplifier connects first comparer.Band-pass filter high and low frequency signal keeps intermediate-freuqncy signal, and the secondary operational amplifier carries out computing to intermediate-freuqncy signal and amplifies, and has improved accuracy and sensitivity that signal receives.
As a kind of preferred version, also be connected with second comparer that is used for comparison signal intensity between automatic gain amplifier and secondary operational amplifier.Signal is transferred to automatic gain amplifier after relatively feeding back through second comparer, is used for not carrying out signal gain amplification once more to meeting the requirements of signal.
The beneficial effect of the utility model is that through measurement and the calibration of timer to the travel-time of ultrasound wave in circulation passage, transit time ultrasonic flow meters can accurately be measured flow rate of fluid and flow, and native system is simple in structure, is easy to realize.
Description of drawings
Fig. 1 is a kind of schematic block circuit diagram of the utility model.
Wherein: 1, ultrasonic transmitter, 2, upstream sensor, 3, downstream sensor, 4, analog switching circuit, 5, automatic gain amplifier, 6, BPF., 7, the secondary operational amplifier, 8, second comparer, 9, first comparer, 10, timer.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described.
Embodiment; A kind of transmission time calibration system of transit time ultrasonic flow meters; Its schematic block circuit diagram is as shown in Figure 1, comprises ultrasonic transmitter 1, upstream sensor 2, downstream sensor 3, analog switching circuit 4, automatic gain amplifier 5, BPF. 6, secondary operational amplifier 7, second comparer 8, first comparer 9 and timer 10.Ultrasonic transmitter all links to each other with timer with first comparer; Ultrasonic transmitter connects upstream sensor and downstream sensor simultaneously; Link to each other through ultrasound wave between upstream sensor and downstream sensor, upstream sensor is connected analog switching circuit simultaneously with downstream sensor, and analog switching circuit connects automatic gain amplifier; Automatic gain amplifier connecting band bandpass filter; BPF. connects the secondary operational amplifier, and the secondary operational amplifier connects first comparer, also is connected with second comparer between automatic gain amplifier and secondary operational amplifier.When ultrasonic transmitter sent ultrasonic signal, timer picked up counting; When measuring the travel-time of following current, send ultrasonic signal through upstream sensor and be sent to downstream sensor, when measuring the travel-time of adverse current, send ultrasonic signal through upstream sensor and be sent to downstream sensor; Final timer is accomplished clocking capability after receiving the electric signal of first comparer, and this section period is hyperacoustic travel-time.Obtain T
SuitableAnd T
ContraryTwo travel-times after, according to
Formula can draw the flow velocity of liquid, and then obtain the flow of liquid.
Timer can calculate upstream sensor or downstream sensor receives the umber of pulse of losing before the signal for the first time, and its detailed process is following:
1, with normal transmission frequency 1MHz emission ultrasonic signal, the mistiming that obtains between the adjacent reception signal through timer after the signal Processing is about 1 μ s, is a hyperacoustic cycle, and keeps a record;
2, ultrasonic transmitter gets into the frequency conversion emission, launches the ultrasonic signal of 3 normal frequencies earlier, and then launches the ultrasonic signal of a 667KHz again;
3, upstream sensor or downstream sensor receive the ultrasonic signal through liquid, handle the mistiming between the adjacent reception signal when obtaining the frequency conversion emission; When detecting the mistiming of departing from normal condition; Just can conclude that this is the starting point of the frequency variation signal that receives, transmitting from ultrasonic transmitter is zero-time, and the starting point that receives frequency variation signal is the termination time; Be designated as Tx during this period of time, drawing Tx through timer is 103 μ s;
4, the time of Tx comprises cycle of ultrasonic signal of travel-time and 3 normal frequencies of ultrasonic signal, can learn that thus travel-time T0 is the time in the cycle of the Tx ultrasonic signal that deducts 3 normal frequencies, and T0 is 100 μ s;
5, first burst lengths 102 μ s that T0 and timer is received imperfect signal compares, and can extrapolate the front has 2 pulse missings;
6, the detected T of timer in real process
SuitableAnd T
ContraryTime of 2 pulse missings obtaining before deducting of time just be real T
SuitableAnd T
ContraryTime.
Claims (3)
1. the transmission time calibration system of a transit time ultrasonic flow meters; Transit time ultrasonic flow meters comprises circulation passage; Be provided with liquid in the circulation passage; It is characterized in that; The transmission time calibration system comprises ultrasonic transmitter (1), be arranged on the circulation passage upper reaches be used to send and the upstream sensor (2) of received ultrasonic signal, be arranged on the circulation passage downstream be used to send and downstream sensor (3), analog switching circuit (4), the automatic gain amplifier (5) of received ultrasonic signal, be used for the zero passage sampling first comparer (9) with have the initial pulse-losing quantity of calculating and be used for calibrating the timer (10) in transmission time; Ultrasonic transmitter all links to each other with timer with first comparer, and ultrasonic transmitter connects upstream sensor and downstream sensor simultaneously, and upstream sensor is connected analog switching circuit with downstream sensor; Analog switching circuit connects automatic gain amplifier, and automatic gain amplifier connects first comparer.
2. the transmission time calibration system of a kind of transit time ultrasonic flow meters according to claim 1; It is characterized in that; Also be provided with BPF. (6) and secondary operational amplifier (7) between the described automatic gain amplifier and first comparer; Automatic gain amplifier connecting band bandpass filter, BPF. connects the secondary operational amplifier, and the secondary operational amplifier connects first comparer.
3. the transmission time calibration system of a kind of transit time ultrasonic flow meters according to claim 2 is characterized in that, also is connected with second comparer (8) that is used for comparison signal intensity between described automatic gain amplifier and secondary operational amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220268472 CN202631065U (en) | 2012-06-05 | 2012-06-05 | Transmission time calibration system for time difference method ultrasonic flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220268472 CN202631065U (en) | 2012-06-05 | 2012-06-05 | Transmission time calibration system for time difference method ultrasonic flowmeter |
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| CN 201220268472 Expired - Fee Related CN202631065U (en) | 2012-06-05 | 2012-06-05 | Transmission time calibration system for time difference method ultrasonic flowmeter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614028A (en) * | 2015-03-07 | 2015-05-13 | 姜跃炜 | High-precision time calibration method used for ultrasonic flow meter |
| WO2017181939A1 (en) * | 2016-04-20 | 2017-10-26 | 成都千嘉科技有限公司 | Method of calibrating ultrasound transmission time for ultrasound flowmeter, system, and flowmeter |
| CN107478282A (en) * | 2017-08-17 | 2017-12-15 | 西南科技大学 | Ultrasonic flow rate detection signal processing method and processing device, time difference method ultrasonic testing system |
| CN107532933A (en) * | 2015-05-08 | 2018-01-02 | 丹佛斯有限公司 | For determining the specifically method of the transmission time of the ultrasonic pulse string in ultrasonic flowmeter, flowmeter |
-
2012
- 2012-06-05 CN CN 201220268472 patent/CN202631065U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614028A (en) * | 2015-03-07 | 2015-05-13 | 姜跃炜 | High-precision time calibration method used for ultrasonic flow meter |
| CN107532933A (en) * | 2015-05-08 | 2018-01-02 | 丹佛斯有限公司 | For determining the specifically method of the transmission time of the ultrasonic pulse string in ultrasonic flowmeter, flowmeter |
| CN107532933B (en) * | 2015-05-08 | 2020-10-27 | 丹佛斯有限公司 | Method for determining the transit time of an ultrasonic pulse train, in particular in an ultrasonic flow meter, flow meter |
| WO2017181939A1 (en) * | 2016-04-20 | 2017-10-26 | 成都千嘉科技有限公司 | Method of calibrating ultrasound transmission time for ultrasound flowmeter, system, and flowmeter |
| AU2017254028B2 (en) * | 2016-04-20 | 2020-04-09 | Chengdu Qianjia Technology Co., Ltd | Method of calibrating ultrasound transmission time for ultrasound flowmeter, system, and flowmeter |
| CN107478282A (en) * | 2017-08-17 | 2017-12-15 | 西南科技大学 | Ultrasonic flow rate detection signal processing method and processing device, time difference method ultrasonic testing system |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20180605 |
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| CF01 | Termination of patent right due to non-payment of annual fee |