CN105675074A - Liquid flow measuring method, device and system - Google Patents
Liquid flow measuring method, device and system Download PDFInfo
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- CN105675074A CN105675074A CN201610029578.9A CN201610029578A CN105675074A CN 105675074 A CN105675074 A CN 105675074A CN 201610029578 A CN201610029578 A CN 201610029578A CN 105675074 A CN105675074 A CN 105675074A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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Abstract
The embodiment of the invention provides a liquid flow measuring method, device and system, and belongs to the technical field of electronics. The method comprises the steps of continuously obtaining three reference liquid level depths, obtaining a liquid level depth contrast threshold on the basis of the three reference liquid level depths, obtaining a liquid level depth to be converted on the basis of the three reference liquid level depths and the liquid level depth contrast threshold, and then obtaining a liquid measuring mode corresponding to the liquid level depth to be converted on the basis of the conversion relation between the preset liquid level depth and liquid flow. The problem that due to large liquid surface fluctuations, the error of a liquid measuring value measured by an existing ultrasonic flowmeter is large is solved.
Description
Technical field
The present invention relates to electronic technology field, in particular to a kind of liquid flow measuring method, device and system.
Background technology
At present, in order to meet country's requirement to the major pollutants overall control of blowdown source, industrial wastewater discharge metering widely uses non-contact measurement. Because ultrasound wave has frequency height, wavelength is short, diffraction is little, good directionality, little, the penetrance of decaying in liquid and solid is big, run into impurity or separating surface has the feature of significant reflection. Use relatively broad based on hyperacoustic effusion meter. In the process of existing ultrasonic flow rate measurement quantity of fluid flow, when being in flow regime due to testing liquid, liquid surface fluctuation is relatively big, causes the fluid flow value error measured by existing ultrasonic flowmeter bigger.
Summary of the invention
It is an object of the invention to provide a kind of liquid flow measuring method, device and system, with improve testing liquid be in flow regime time, liquid surface fluctuation is relatively big, causes the problem that the fluid flow value error measured by existing ultrasonic flowmeter is bigger.
First aspect, embodiment of the present invention one liquid flow measuring method, it is applied to liquid flow measurement device, described liquid flow measurement device includes probe portion and controller, described probe portion electrically connects with described controller, and described probe portion includes the ultrasonic emitting head and the ultrasound wave reception head that are positioned at same level; Described method, including:
The ultrasound wave of described controller testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface; ,
Described controller calculates the described probe portion preset and the difference of the second spacing and described first spacing that carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid;
Described liquid flow measurement device obtains three described reference level degree of depth continuously, liquid level depth correlation threshold value is obtained based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted;
Described liquid flow measurement device, based on the transformational relation between default the liquid level degree of depth and fluid flow, obtains the fluid flow corresponding with the described liquid level degree of depth to be converted.
Second aspect, embodiments provide a kind of liquid flow measurement device, described liquid flow measurement device includes probe portion and controller, described probe portion electrically connects with described controller, described memorizer storage has the transformational relation between the liquid level degree of depth and fluid flow, described probe portion to include being positioned at ultrasonic emitting head and the ultrasound wave reception head of same level;
Described ultrasonic emitting head is used for launching ultrasound wave;
Described ultrasound wave receives head and is used for the ultrasound wave after receiving reflection;
Described controller, for the ultrasound wave of the testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface; The difference of the second spacing and described first spacing that calculate the described probe portion preset and carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid; Obtain three described reference level degree of depth continuously, obtain liquid level depth correlation threshold value based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted; Based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow corresponding with the described liquid level degree of depth to be converted.
The third aspect, embodiments provides a kind of liquid flow measurement system, and described liquid flow measurement system includes liquid flow measurement device and weir notch; Described liquid flow measurement device includes probe portion and controller, described probe portion electrically connects with described controller, described probe portion is arranged at the predetermined position above described weir notch, and described probe portion includes the ultrasonic emitting head and the ultrasound wave reception head that are positioned at same level;
Described weir notch, is used for carrying testing liquid;
Described controller, for the ultrasound wave of the testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface; The difference of the second spacing and described first spacing that calculate the described probe portion preset and carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid; Obtain three described reference level degree of depth continuously, obtain liquid level depth correlation threshold value based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted; Based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow corresponding with the described liquid level degree of depth to be converted.
The liquid flow measuring method that the embodiment of the present invention provides, device and system, three described reference level degree of depth are obtained continuously by described liquid flow measurement device, liquid level depth correlation threshold value is obtained based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted, again based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow mode corresponding with the described liquid level degree of depth to be converted, improve liquid surface fluctuation bigger, cause the problem that the fluid flow value error measured by existing ultrasonic flowmeter is bigger.
Other features and advantages of the present invention will be set forth in description subsequently, and, partly become apparent from description, or understand by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be realized by structure specifically noted in the description write, claims and accompanying drawing and be obtained.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings. Shown in accompanying drawing, above-mentioned and other purpose, feature and the advantage of the present invention will become apparent from. The part that accompanying drawing labelling instruction identical in whole accompanying drawings is identical. Deliberately do not draw accompanying drawing by actual size equal proportion convergent-divergent, it is preferred that emphasis is the purport of the present invention is shown.
Fig. 1 illustrates the structural representation of a kind of liquid flow measurement system that first embodiment of the invention provides;
Fig. 2 illustrates the structured flowchart of a kind of liquid flow measurement device that second embodiment of the invention provides;
Fig. 3 illustrates the flow chart of a kind of liquid flow measuring method that third embodiment of the invention provides;
Fig. 4 illustrates the flow chart of a kind of liquid flow measuring method that fourth embodiment of the invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete description, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
As it is shown in figure 1, a kind of liquid flow measurement system 100 that first embodiment of the invention provides, described liquid flow measurement system 100 includes liquid flow measurement device, weir notch 103 and stilling well 104, and described stilling well 104 connects with described weir notch 103; Described liquid flow measurement device includes controller 101 and probe portion 102, described probe portion 102 electrically connects with described controller 101, described probe portion 102 is arranged at the predetermined position above described stilling well 104, and described probe portion 102 includes the ultrasonic emitting head and the ultrasound wave reception head that are positioned at same level;
Described weir notch 103, is used for carrying testing liquid;
Described controller 101, for the ultrasound wave of the testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface; The difference of the second spacing and described first spacing that calculate the described probe portion preset and carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid; Obtain three described reference level degree of depth continuously, obtain liquid level depth correlation threshold value based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted; Based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow corresponding with the described liquid level degree of depth to be converted.
It should be noted that weir notch 103 material selection 316 rustless steel, inner surface is smooth, and wall thickness should be greater than 2.5mm, and throat portion is critical size, and more accurate, width error is not above 0.2%, and error in length is not above 0.1%.
As preferably, probe portion be arranged on 3 times from weir plate maximum head in upstream～4 times of places. Flatten at the bottom of canal, be beneficial to improving measurement accuracy.
Liquid flow measurement device installs first, overhaul, be moved through probe after, will the liquid level of calibrated meter. The purpose of calibration liquid level is that the level value making liquid flow measurement measurement device is consistent with the actual water level in weir notch. Calibration liquid level the best way is that to allow the water level in weir notch be just zero, and the liquid level that check and correction liquid flow measurement device shows also is zero. In reality, weir notch can not be cut off the water. In this case, the indicating value liquid level weir slot liquid level equal to actual measurement of liquid flow measurement device can only be calibrated. Baxeer slot must see going to the bottom of import contraction section when surveying the zero water level of liquid level.
The liquid flow measurement system that the embodiment of the present invention provides, three described reference level degree of depth are obtained continuously by described liquid flow measurement device, liquid level depth correlation threshold value is obtained based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted, again based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow mode corresponding with the described liquid level degree of depth to be converted, improve liquid surface fluctuation bigger, cause the problem that the fluid flow value error measured by existing ultrasonic flowmeter is bigger.
Refer to Fig. 2, a kind of liquid flow measurement device 200 that second embodiment of the invention provides, described liquid flow measurement device 200 includes controller 201 and probe portion 202, described probe portion 202 electrically connects with described controller 201, the storage of described memorizer 203 has the transformational relation between the liquid level degree of depth and fluid flow, and described probe portion 202 includes the ultrasonic emitting head and the ultrasound wave reception head that are positioned at same level;
Described ultrasonic emitting head is used for launching ultrasound wave;
Described ultrasound wave receives head and is used for the ultrasound wave after receiving reflection;
Described controller 201, for the ultrasound wave of the testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface; The difference of the second spacing and described first spacing that calculate the described probe portion preset and carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid; Obtain three described reference level degree of depth continuously, obtain liquid level depth correlation threshold value based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted; Based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow corresponding with the described liquid level degree of depth to be converted.
It should be noted that those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, the system of foregoing description, device specific works process, it is possible to reference to the corresponding process in aftermentioned embodiment of the method, do not repeat them here.
Refer to Fig. 3, a kind of liquid flow measuring method that third embodiment of the invention provides, it is applied to liquid flow measurement device, described liquid flow measurement device includes probe portion and controller, described probe portion electrically connects with described controller, and described probe portion includes the ultrasonic emitting head and the ultrasound wave reception head that are positioned at same level; Described method, including:
Step S301: the ultrasound wave of described controller testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface.
The liquid level degree of depth for testing liquid, need to measure the spacing between probe portion and testing liquid surface, then deduct the spacing between probe portion and testing liquid surface then for the liquid level of testing liquid according to probe portion and the spacing carried between described testing liquid.
In the present embodiment, adopt the mode of ultrasonic ranging, measure the spacing between probe portion and testing liquid surface. Described ultrasonic emitting head is used for launching ultrasound wave, the ultrasound wave that ultrasonic emitting hair is penetrated, after being reflected by testing liquid surface, received head again to receive, make the ultrasound wave of described controller testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface.
In order to obtain described first spacing, as a kind of embodiment, described controller obtains hyperacoustic actual propagation speed and ultrasound wave and receives the transmission time between head at described ultrasonic emitting head and ultrasound wave, and the described transmission time includes the described ultrasound wave the first transmission time between described ultrasonic emitting head and described testing liquid surface and described ultrasound wave and receives the second transmission time between head on described testing liquid surface and described ultrasound wave.
In the process measured, ultrasonic propagation velocity directly affects the described transmission time, thus affecting level gauging accuracy. Being experimentally confirmed, ultrasonic propagation velocity can be subject to ambient temperature, air pressure etc. to affect. Its Changing Pattern is: variations in temperature 1e, and sonic velocity change is about 0.17%; Air pressure often changes 0.1kPa, and the velocity of sound about changes 0.05%, so velocity of sound temperature influence is the most notable, it is possible to by the method for temperature-compensating, spread speed is corrected for.
Described actual propagation speed is corrected hyperacoustic initial propagation velocities set in advance by described controller according to the temperature value of temperature sensor collection and is obtained. Such as initial propagation velocities is 331.45m/s, and the ambient temperature of temperature sensor collection is 25 DEG C, then the actual propagation speed C=331.45+0.61*25 after correcting.
Described controller obtains the first spacing of described probe portion and described testing liquid surface according to described actual propagation speed and described transmission Time Calculation.
Step S302: described controller calculates the described probe portion preset and the difference of the second spacing and described first spacing that carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid.
The second spacing bottom probe portion and weir notch, is determined by the installation site of liquid flow measurement device described when installing. After the second spacing is determined, it is stored in the memorizer of liquid flow measurement device, after microcontroller obtains the first spacing, then from memorizer, obtains described second spacing, calculate the difference of the second spacing and described first spacing, using the described difference reference level degree of depth as described testing liquid.
Step S303: described liquid flow measurement device obtains three described reference level degree of depth continuously, liquid level depth correlation threshold value is obtained based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted.
All the time be in the state of flowing due to the testing liquid in weir notch, liquid surface fluctuation is relatively big, causes hyperacoustic reflective distance different. The measurement error caused to overcome liquid surface to fluctuate, described liquid flow measurement device needs to obtain continuously three described reference level degree of depth, liquid level depth correlation threshold value is obtained based on three described reference level degree of depth, again based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted.
Step S304: described liquid flow measurement device, based on the transformational relation between default the liquid level degree of depth and fluid flow, obtains the fluid flow corresponding with the described liquid level degree of depth to be converted.
For different weir notches, the transformational relation between the liquid level degree of depth and fluid flow is different, in the present embodiment, preferably employs Baxeer slot as one. Because the structure that Baxeer slot is special, testing liquid flowing velocity in groove is accelerated, sedimentary accumulation there is mitigation, and it needs certain water-head like that not as weir flowmeter, the loss of its water level is only the 1/4 of weir formula, therefore, employing Baxeer slot combines with ultrasonic liquid level sensor and measures open channel flow rate is a good selection. When weir notch is Baxeer slot, as a kind of embodiment, the transformational relation between the liquid level degree of depth and fluid flow can be Q=C*han, wherein C is constant, and ha is the liquid level degree of depth to be converted, and n is multiple. Wherein, as a kind of mode, C is 0.177, n is 1.55.
The liquid flow measuring method that the embodiment of the present invention provides, three described reference level degree of depth are obtained continuously by described liquid flow measurement device, liquid level depth correlation threshold value is obtained based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted, again based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow mode corresponding with the described liquid level degree of depth to be converted, improve liquid surface fluctuation bigger, cause the problem that the fluid flow value error measured by existing ultrasonic flowmeter is bigger.
Refer to Fig. 4, a kind of liquid flow measuring method that fourth embodiment of the invention provides, it is applied to liquid flow measurement device, described liquid flow measurement device includes probe portion and controller, described probe portion electrically connects with described controller, and described probe portion includes the ultrasonic emitting head and the ultrasound wave reception head that are positioned at same level; Described method, including:
Step S401: the ultrasound wave of described controller testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface.
Step S402: described controller calculates the described probe portion preset and the difference of the second spacing and described first spacing that carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid.
Step S403: described liquid flow measurement device obtains the first reference level degree of depth, the second reference level degree of depth and the 3rd reference level degree of depth continuously.
Step S404: described liquid flow measurement device obtains the first reference threshold, described first reference threshold is the absolute value of the described second reference level degree of depth and the difference of the described first reference level degree of depth; Obtaining the second reference threshold, described second reference threshold is the absolute value of the described 3rd reference level degree of depth and the difference of the described second reference level degree of depth; Using the arithmetic mean of instantaneous value of described first reference threshold and described second reference threshold as described liquid level depth correlation threshold value.
Step S405: according to the described first reference level degree of depth, the second reference level degree of depth and the 3rd reference level degree of depth, and the described liquid level depth correlation threshold value acquisition liquid level degree of depth to be converted.
In the process obtaining the conversion liquid level degree of depth, the difference of the described second reference level degree of depth with the first reference level degree of depth is contrasted by described liquid flow measurement device with described liquid level depth correlation threshold value; When the difference of the described second reference level degree of depth and the first reference level degree of depth is less than described liquid level depth correlation threshold value, using the described second reference level degree of depth as the described liquid level degree of depth to be converted.
When the difference of the described second reference level degree of depth and the first reference level degree of depth is more than described liquid level depth correlation threshold value, the difference of the described 3rd reference level degree of depth with the second reference level degree of depth is contrasted with described liquid level depth correlation threshold value, when the difference of the described 3rd reference level degree of depth and the second reference level degree of depth is less than described liquid level depth correlation threshold value, using the described 3rd reference level degree of depth as the described liquid level degree of depth to be converted.
When the difference of the described second reference level degree of depth and the first reference level degree of depth is more than described liquid level depth correlation threshold value, and when the difference of the described 3rd reference level degree of depth and the second reference level degree of depth is more than described liquid level depth correlation threshold value, by the difference of the described second reference level degree of depth Yu the first reference level degree of depth, with the arithmetic mean of instantaneous value of the described 3rd reference level degree of depth and the difference of the second reference level degree of depth as the described liquid level degree of depth to be converted.
Step S406: described liquid flow measurement device, based on the transformational relation between default the liquid level degree of depth and fluid flow, obtains the fluid flow corresponding with the described liquid level degree of depth to be converted.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, and the specific works process of the system of foregoing description, device and unit, it is possible to reference to the corresponding process in preceding method embodiment, do not repeat them here.
It addition, flow chart and block diagram in accompanying drawing show according to the system of multiple embodiments of the present invention, the architectural framework in the cards of method and computer program product, function and operation. In this, flow chart or each square frame in block diagram can represent a part for a module, program segment or code, and a part for described module, program segment or code comprises the executable instruction of one or more logic function for realizing regulation. It should also be noted that at some as in the realization replaced, the function marked in square frame can also to be different from the order generation marked in accompanying drawing. Such as, two continuous print square frames can essentially perform substantially in parallel, and they can also perform sometimes in the opposite order, and this determines according to involved function. It will also be noted that, the combination of the square frame in each square frame in block diagram and/or flow chart and block diagram and/or flow chart, can realize by the special hardware based system of the function or action that perform regulation, or can realize with the combination of specialized hardware Yu computer instruction.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method, it is possible to realize by another way. Device embodiment described above is merely schematic, such as, the division of described unit, it is only a kind of logic function to divide, actual can have other dividing mode when realizing, again such as, multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can ignore, or do not perform. Another point, shown or discussed coupling each other or direct-coupling or communication connection can be through INDIRECT COUPLING or the communication connection of some communication interfaces, device or unit, it is possible to be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, namely may be located at a place, or can also be distributed on multiple NE. Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.
It should be noted that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment. When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.
Claims (10)
1. a liquid flow measuring method, it is characterized in that, it is applied to liquid flow measurement device, described liquid flow measurement device includes probe portion and controller, described probe portion electrically connects with described controller, and described probe portion includes the ultrasonic emitting head and the ultrasound wave reception head that are positioned at same level; Described method, including:
The ultrasound wave of described controller testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface; ,
Described controller calculates the described probe portion preset and the difference of the second spacing and described first spacing that carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid;
Described liquid flow measurement device obtains three described reference level degree of depth continuously, liquid level depth correlation threshold value is obtained based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted;
Described liquid flow measurement device, based on the transformational relation between default the liquid level degree of depth and fluid flow, obtains the fluid flow corresponding with the described liquid level degree of depth to be converted.
2. method according to claim 1, it is characterised in that the ultrasound wave of described controller testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface, including:
Described controller obtains hyperacoustic actual propagation speed and ultrasound wave and receives the transmission time between head at described ultrasonic emitting head and ultrasound wave, and the described transmission time includes the described ultrasound wave the first transmission time between described ultrasonic emitting head and described testing liquid surface and described ultrasound wave and receives the second transmission time between head on described testing liquid surface and described ultrasound wave;
Described controller obtains the first spacing of described probe portion and described testing liquid surface according to described actual propagation speed and described transmission Time Calculation.
3. method according to claim 2, it is characterised in that described liquid flow measurement device also includes the temperature sensor for detecting described liquid flow measurement device local environment temperature, and described temperature sensor electrically connects with described controller; Described controller obtains the hyperacoustic actual propagation speed launched, including:
Described controller obtains the temperature value that described temperature sensor gathers;
Hyperacoustic initial propagation velocities set in advance is corrected by described controller according to described temperature value, obtains described actual propagation speed.
4. according to the arbitrary described method of claim 1-3, it is characterized in that, three described reference level degree of depth include the first reference level degree of depth, the second reference level degree of depth and the 3rd reference level degree of depth that obtain continuously with predetermined period, described based on three described reference level degree of depth acquisition liquid level depth correlation threshold values, including:
Described liquid flow measurement device obtains the first reference threshold, and described first reference threshold is the absolute value of the described second reference level degree of depth and the difference of the described first reference level degree of depth;
Described liquid flow measurement device obtains the second reference threshold, and described second reference threshold is the absolute value of the described 3rd reference level degree of depth and the difference of the described second reference level degree of depth;
Described liquid flow measurement device using the arithmetic mean of instantaneous value of described first reference threshold and described second reference threshold as described liquid level depth correlation threshold value.
5. method according to claim 4, it is characterised in that described based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtains the liquid level degree of depth to be converted, including:
The difference of the described second reference level degree of depth with the first reference level degree of depth is contrasted by described liquid flow measurement device with described liquid level depth correlation threshold value;
When the difference of the described second reference level degree of depth and the first reference level degree of depth is less than described liquid level depth correlation threshold value, using the described second reference level degree of depth as the described liquid level degree of depth to be converted.
6. method according to claim 4, it is characterised in that described based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtains the liquid level degree of depth to be converted, including:
The difference of the described second reference level degree of depth with the first reference level degree of depth is contrasted by described liquid flow measurement device with described liquid level depth correlation threshold value, the difference of the described 3rd reference level degree of depth with the second reference level degree of depth is contrasted with described liquid level depth correlation threshold value;
When the difference of the described second reference level degree of depth and the first reference level degree of depth is more than described liquid level depth correlation threshold value, and the difference of the described 3rd reference level degree of depth and the second reference level degree of depth is less than when the described liquid level depth correlation threshold value, using the described 3rd reference level degree of depth as the described liquid level degree of depth to be converted.
7. method according to claim 4, it is characterised in that described based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtains the liquid level degree of depth to be converted, including:
The difference of the described second reference level degree of depth with the first reference level degree of depth is contrasted by described liquid flow measurement device with described liquid level depth correlation threshold value, the difference of the described 3rd reference level degree of depth with the second reference level degree of depth is contrasted with described liquid level depth correlation threshold value;
When the difference of the described second reference level degree of depth and the first reference level degree of depth is more than described liquid level depth correlation threshold value, and the difference of the described 3rd reference level degree of depth and the second reference level degree of depth more than described liquid level depth correlation threshold value time, by the difference of the described second reference level degree of depth Yu the first reference level degree of depth, with the arithmetic mean of instantaneous value of the described 3rd reference level degree of depth and the difference of the second reference level degree of depth as the described liquid level degree of depth to be converted.
8. a liquid flow measurement device, it is characterized in that, described liquid flow measurement device includes probe portion and controller, described probe portion electrically connects with described controller, described memorizer storage has the transformational relation between the liquid level degree of depth and fluid flow, described probe portion to include being positioned at ultrasonic emitting head and the ultrasound wave reception head of same level;
Described ultrasonic emitting head is used for launching ultrasound wave;
Described ultrasound wave receives head and is used for the ultrasound wave after receiving reflection;
Described controller, for the ultrasound wave of the testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface; The difference of the second spacing and described first spacing that calculate the described probe portion preset and carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid; Obtain three described reference level degree of depth continuously, obtain liquid level depth correlation threshold value based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted; Based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow corresponding with the described liquid level degree of depth to be converted.
9. a liquid flow measurement system, it is characterised in that described liquid flow measurement system includes liquid flow measurement device, weir notch and stilling well, and described stilling well connects with described weir notch; Described liquid flow measurement device includes controller and probe portion, described probe portion electrically connects with described controller, described probe portion is arranged at the predetermined position above described stilling well, and described probe portion includes the ultrasonic emitting head and the ultrasound wave reception head that are positioned at same level;
Described weir notch, is used for carrying testing liquid;
Described controller, for the ultrasound wave of the testing liquid surface reflection received by described reception head, it is thus achieved that first spacing on described probe portion and described testing liquid surface; The difference of the second spacing and described first spacing that calculate the described probe portion preset and carry bottom the weir notch of described testing liquid, using the described difference reference level degree of depth as described testing liquid; Obtain three described reference level degree of depth continuously, obtain liquid level depth correlation threshold value based on three described reference level degree of depth, based on three described reference level degree of depth and described liquid level depth correlation threshold value, obtain the liquid level degree of depth to be converted; Based on the transformational relation between default the liquid level degree of depth and fluid flow, obtain the fluid flow corresponding with the described liquid level degree of depth to be converted.
10. liquid flow measurement system according to claim 9, it is characterised in that described system also includes temperature sensor, and described temperature sensor electrically connects with described controller;
Temperature sensor, for detecting the temperature value of described liquid flow measurement device local environment temperature, so that hyperacoustic initial propagation velocities set in advance is corrected by described controller according to described temperature value, obtains hyperacoustic actual propagation speed.
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