CN207816406U - A kind of ultrasonic wave liquid level measuring apparatus - Google Patents
A kind of ultrasonic wave liquid level measuring apparatus Download PDFInfo
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- CN207816406U CN207816406U CN201721357424.9U CN201721357424U CN207816406U CN 207816406 U CN207816406 U CN 207816406U CN 201721357424 U CN201721357424 U CN 201721357424U CN 207816406 U CN207816406 U CN 207816406U
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Abstract
The utility model discloses a kind of ultrasonic wave liquid level measuring apparatus, including signal acquiring system and signal transmitting system, the signal acquiring system is made of receiving transducer, preamplifier, main amplifier, capture card and computer, the signal transmitting system includes signal projector and transmitting probe, it is characterized in that, transmitting probe and receiving transducer are attached to the wall surface of tested device；Receiving transducer is connected by preamplifier with main amplifier；Capture card one end is connected with main amplifier, and the other end is connected with computer；Signal generator one end is connected with transmitting probe, and the other end is connected with computer.Can adapt to a variety of measuring environments such as liquid fluctuating, entrainment, inner member complexity using the utility model, can accurately, steadily detect liquid level.
Description
Technical field
The utility model is related to level sensing fields, and in particular to a kind of Ultrasonic Liquid Level Measurement and device.
Background technology
Liquid level is the life such as Domestic steamer, fresh and living aquatic products transfer cask, wet tank, gas-liquid bubble column and production dress
The important parameter set, the rate of change of liquid level can be used for characterizing the patency and stability of discharging, to liquid storaging device,
The operation of gas liquid reaction system plays an important role.But in gas-liquid system, due to the disengaging of gas/liquid material, gas sparging,
The effects that gas jet, causes liquid fluctuating amplitude larger or phenomena such as entrainment occurs, is brought to the accurate measurement of liquid level
Bigger difficulty.
Conventional static liquid level can use hydrostatic profile level meter, radar type level meter, ultrasonic material level meter, capacitive level probe
With the methods of nuclear radiation level meter is accurate measures, but the accurate of dynamic liquid level, especially gas-liquid system liquid level measures so far still
It is so one of the problem of multiphase flow detection field.As it can be seen that exploitation one kind can adapt to complex environment, non-intrusion type, safety and environmental protection
Liquid-level detecting method and device, be used for the detection of gas-liquid system dynamic liquid level, to ensuring equipment normal operation, improve device
Economic benefit is of great significance.
Utility model content
A kind of Ultrasonic Liquid Level Measurement of the utility model offer and device, this method can adapt to liquid fluctuating, mist
A variety of measuring environments such as foam entrainment, inner member complexity, can accurately, steadily detect liquid level.
A kind of Ultrasonic Liquid Level Measurement, includes the following steps：
Step 1, the transmitting probe of signal transmitting system is mounted on gas-liquid bubbling device side wall surface lower part, signal is occurred
The signal that device generates is converted to ultrasonic signal；
Step 2, the receiving transducer of signal acquiring system is mounted on gas-liquid bubbling device side wall surface top, receives ultrasonic wave
Signal, and it is transferred to capture card and computer after ultrasonic signal is converted to electric signal；
Step 3, according to the amplitude attenuation principle and shock absorption principle of ultrasonic signal, ultrasonic wave damping vibration attenuation liquid level is established
Detection model；
Step 4, according to ultrasonic wave damping vibration attenuation level sensing model, being associated between the signal received and liquid level is established
Formula is detected liquid level.
In step 1, the ultrasonic signal frequencies that signal generator generates are 50~250kHz, preferably 100~200kHz.
In step 2, the sample frequency of receiving transducer is 100kHz~500kHz, preferably 100
KHz~300kHz.
In step 3, the ultrasonic wave damping vibration attenuation level sensing model is：
Y=xexp (C (1-x))
Wherein
X=H/L
Y=(E0-E)/(E0-EL)
In formula, E0Liquid level is represented in transmitting probe, the signal energy that receiving transducer receives；E represents liquid level as H
When the energy that receives of receiving transducer, ELLiquid level is represented as L, i.e. liquid level receiving transducer at receiving transducer position receives
Energy, C be dimensionless equation model parameter.
Before device opens survey, by with (including transmitting probe and receiving transducer) between transmitting probe and receiving transducer at least
4 liquid levels carry out static and dynamic liquid level measurement experiment, and handle the data of acquisition as measurement point, obtain it is no because
The model parameter C of equation of n th order n.
Device is needed there are multiple batches, and when the big liquid material of density, viscosity differences to obtaining liquid material
The relational expression of density, viscosity and model parameter C, to be corrected to model.
When liquid level detects, the receiving voltage of ultrasonic level gage output is recorded by capture card and computer, is received
Probe and transmitting probe center of circle spacing are more than 2 times of probe diameter.
The utility model provides a kind of ultrasonic wave liquid level measuring apparatus, including signal acquiring system and signal transmitting system,
The signal acquiring system is made of receiving transducer, preamplifier, main amplifier, capture card and computer, the signal hair
The system of penetrating includes signal projector and transmitting probe, and wherein transmitting probe is attached to the wall surface of measured device；Receiving transducer is attached to
The wall surface of tested device is connected through preamplifier with main amplifier；Capture card one end is connected with main amplifier, the other end with
Computer is connected；Signal generator one end is connected with transmitting probe, and the other end is connected with computer；Computer includes that display fills
It sets, data storage device and central processing unit.
The receiving transducer is identical with the quantity of the preamplifier, is 1~10.When the multiple receiving transducers of installation
When, the spacing between receiving transducer is identical.
The capture card acquires the different signal of at least ten, and passes through cable or wireless transport module and computer phase
Even.
The ultrasonic solution position-finding that the utility model uses is amplitude attenuation principle and damping based on ultrasonic signal
Principle establishes damping vibration attenuation level sensing model.Under same wall surface material, wherein the decaying of ultrasonic signal is mainly by object
Caused by expecting the radiation damping generated, different liquid levels causes the attenuation degree of acoustic signals also different.
The utility model uses the measurement method that transmitting probe and receiving transducer are placed in device side wall surface, operates simple side
Just, and the complex environments such as liquid fluctuating, entrainment, inner member complexity will not can be applicable in material directly contact, it can be accurate
Really, liquid level is steadily detected.
Description of the drawings
Fig. 1 is liquid level detection device schematic diagram；
Fig. 2 is bubbling area static state liquid level ultrasonic damping attenuation model predicted value and actual comparison figure；
Fig. 3 is that bubbling area liquid level and ultrasonic energy change with time relationship；
Fig. 4 is bubbling area dynamic liquid level ultrasonic wave damping vibration attenuation model predication value and actual comparison figure.
Specific implementation mode
In order to more specifically describe the utility model, below in conjunction with the accompanying drawings and specific implementation mode is to the utility model
Technical solution is described in detail.
Experimental provision used in the utility model is as shown in Figure 1, include receiving transducer 1, preamplifier 2, signal generation
Device and signal conversion mold integration module 3, capture card 4, computer 5, gas-liquid bubbling device 6, valve 7 and transmitting probe 8 form,
In experimentation, the sample frequency of acoustic signals is 500kHz.Transmitting probe is arranged at the wall surface of bottom of device, receives and visits
At the wall surface that head is arranged at the top of device.In dynamic liquid level test experience, for more intuitively observation liquid level variation, use
Camera method records the dynamic changing process of liquid level.
Embodiment 1：Gas-liquid bubbling device static state level gauging
The liquid used in experiment can inject for water from top water filling port, can also be flowed out from lower part valve, to change
Liquid level in gas-liquid bubbling device 6.The acoustical signal that receiving transducer 1 is surveyed is remembered after being converted to electric signal by capture card 4 and computer 5
Record.Transmitting probe 8 generates 200kHz square wave acoustical signals, and 1 sample frequency of receiving transducer is 500kHz.
Specific experimental program is as follows：
(1) transmitting probe 8 is located at the lower section of gas-liquid bubbling device 6 when testing, apart from gas feed 50mm, receiving transducer 1
It is placed in the top of gas-liquid bubbling device 6, is 400mm at a distance from transmitting probe 8
(2) liquid level increases the liquid volume in gas-liquid bubbling device 6 every time since 6 bottom of gas-liquid bubbling device so that
Hydrostatic position is respectively 220mm, 250mm, 280mm and 310mm, and 10 cubic metres are then passed through into gas-liquid bubbling device 6 per hour
Air, etc. be acquired again after stable output signals, sampling time 10s；
(3) after the collected signal of receiving transducer is changed into electric signal, acquired card 4 is transferred to computer 5.
To collected acoustical signal and measure obtained liquid level and carry out data processing, obtain zero dimension energy and without because
The prediction result of secondary liquid level is as shown in Fig. 2, ultrasonic wave damping vibration attenuation level sensing model is：
Y=xexp (1.2143 (1-x))
The evenness of model predication value and experiment value is 1.36% to error, shows ultrasonic wave damping vibration attenuation level sensing mould
Type coincide preferable with experimental data.
Embodiment 2：Gas-liquid bubbling device dynamic liquid level measures
The liquid used in experiment can inject for water from top water filling port, can also be flowed out from lower part valve, to change
Liquid level in gas-liquid bubbling device 6.The acoustical signal that receiving transducer 1 is surveyed is remembered after being converted to electric signal by capture card 4 and computer 5
Record.Transmitting probe 8 generates the square-wave signal of 175kHz, and 1 sample frequency of receiving transducer is 500kHz.
(1) flowing water Valve 7 is closed in testing, and injects liquid from the liquid injection port on 6 top of gas-liquid bubbling device, liquid level is every
Minute increases 50mm, and it is 20 cubic metres of air hourly to be passed through flow into gas-liquid bubbling device, and liquid level is continuous since 0
It increases at receiving transducer 1,1 continuous acquisition signal of receiving transducer during liquid level rises；
(2) gas feed is located at 1 lower section of transmitting probe 8 and receiving transducer.Transmitting probe 8 is mounted on gas-liquid bubbling device 6
Lower sidewall is mounted on 6 side wall upper part of gas-liquid bubbling device in vertical direction, vertically apart from gas feed 50mm, receiving transducer 1
Direction carries out the detection of bubbling area liquid level consecutive variations process apart from gas feed 1050mm.
Fig. 3 is bubbling area level sensing experimental result.During adding water, visited when liquid level is gradually increasing to emit by lower section
When first 8, detection signal declines rapidly；When liquid level further increases, detection signal linear reduction with the raising of liquid level；Stop
Only plus after water, liquid level tends to be steady, and detection signal also tends to steadily.In the process of water release, reduction of the signal with liquid level is detected
And linearly increase, when liquid level passes through lower section transmitting probe 8, detection signal gos up rapidly and finally stabilization is initial before adding water
Value.
The experimental results showed that when liquid level consecutive variations in bubbling area in gas-liquid bubbling device 6, the sound of ultrasonic liquid level measuring
Signal amplitude shows preferable monotone variation rule, illustrates that it has the energy of the continuous liquid level variation in bubbling area in monitoring bubble tower
Power.
The prediction result of dynamic liquid level zero dimension energy and zero dimension liquid level is as shown in figure 4, ultrasonic wave damping vibration attenuation
Level sensing model is：
Y=xexp (0.2426 (1-x))
The average relative error of model predication value and experiment value is 5.78%, shows ultrasonic wave damping vibration attenuation level sensing mould
Type coincide preferable with experimental data.
The technical solution of the utility model and advantageous effect is described in detail in above-described specific implementation mode,
It should be understood that the above is only the preferred embodiment of the present invention, it is not intended to limit the utility model, it is all in this reality
With any modification, supplementary, and equivalent replacement etc. done in novel spirit, the protection of the utility model should be included in
Within the scope of.
Claims (4)
1. a kind of ultrasonic wave liquid level measuring apparatus, including signal acquiring system and signal transmitting system, the signal acquiring system
It is made of receiving transducer, preamplifier, main amplifier, capture card and computer, the signal transmitting system includes signal hair
Emitter and transmitting probe, which is characterized in that further include gas-liquid bubbling device and valve, transmitting probe and receiving transducer are attached to gas-liquid
The wall surface of bubbling device；Receiving transducer is connected by preamplifier with main amplifier；Capture card one end is connected with main amplifier,
The other end is connected with computer；Signal generator one end is connected with transmitting probe, and the other end is connected with computer；Transmitting probe is pacified
Mounted in gas-liquid bubbling device lower sidewall, receiving transducer is mounted on gas-liquid bubbling device side wall upper part；Receiving transducer and transmitting are visited
Head center of circle spacing is more than 2 times of probe diameter.
2. ultrasonic wave liquid level measuring apparatus according to claim 1, which is characterized in that the receiving transducer and described preposition
The quantity of amplifier is identical.
3. ultrasonic wave liquid level measuring apparatus according to claim 1 or 2, which is characterized in that the receiving transducer quantity is 1
~10, the spacing between receiving transducer is identical.
4. ultrasonic wave liquid level measuring apparatus according to claim 1, which is characterized in that the capture card acquires at least ten
Signal, and be connected with computer by cable or wireless transport module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721357424.9U CN207816406U (en) | 2017-10-20 | 2017-10-20 | A kind of ultrasonic wave liquid level measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721357424.9U CN207816406U (en) | 2017-10-20 | 2017-10-20 | A kind of ultrasonic wave liquid level measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207816406U true CN207816406U (en) | 2018-09-04 |
Family
ID=63337247
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721357424.9U Active CN207816406U (en) | 2017-10-20 | 2017-10-20 | A kind of ultrasonic wave liquid level measuring apparatus |
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| CN (1) | CN207816406U (en) |
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2017
- 2017-10-20 CN CN201721357424.9U patent/CN207816406U/en active Active
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