CN104266715A - Automatic calibration gas medium ultrasonic level gauge - Google Patents
Automatic calibration gas medium ultrasonic level gauge Download PDFInfo
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- CN104266715A CN104266715A CN201410493045.7A CN201410493045A CN104266715A CN 104266715 A CN104266715 A CN 104266715A CN 201410493045 A CN201410493045 A CN 201410493045A CN 104266715 A CN104266715 A CN 104266715A
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Abstract
The invention discloses an automatic calibration gas medium ultrasonic level gauge. The automatic calibration gas medium ultrasonic level gauge comprises two or more ultrasonic sensors with height difference and a control unit, during usage, the two or more ultrasonic sensors with height difference send ultrasonic signals to a liquid level simultaneously or at intervals, the control unit obtains time difference of signal receiving of all ultrasonic sensors, real-time gas sound velocity can be calculated through the time difference and the height difference, gas sound velocity data are stored in the control unit, calibration of the real-time gas sound velocity can be finished, the liquid level height is measured through the ultrasonic sensors, detecting accuracy and detecting reliability are quite high, calibration can be automatically finished, and usage is extremely convenient.
Description
Technical field
The present invention relates to a kind of ultrasonic level gage of aerosphere type automatic calibration.
Background technology
At present, ultrasonic level gage is of many uses in Industry Control, compares that to have safety with other measuring method radiationless, easy for installation, the features such as long service life.Conventional ultrasonic liquid level measuring technology has sensor to be positioned over liquid neutralization to be positioned on liquid level two kinds of modes in gas medium.
The mode that ultrasonic sensor is placed in liquid easily reaches higher precision, but measurement mechanism can be subject to residue liquid greasy deposits, and by corrosive effects, and maintenance is inconvenient.The mode that ultrasonic sensor is positioned on liquid level in gas medium is easy to use, and maintenance cost is lower, but the accuracy of measurement result needs the accuracy depending on the gas velocity of sound.Air, can by formula close to the main temperature influence of its velocity of sound of ideal gas:
C＝331.3+(0.606T)m/s
Calculate, wherein T is gas temperature.When medium close to ideal gas (as air) and gas temperature accurate known time, likely reach higher precision, but real system measured in industrial control process often more complicated, gas temperature is a parameter changed often, and level gauging is difficult to reach high precision.For in non-ideal gas environment, also will introduce pressure data during calculating, make measurement mechanism more complicated, precision is more difficult to reach requirement.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of ultrasonic level gage of aerosphere type automatic calibration.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of ultrasonic level gage of aerosphere type automatic calibration, comprise the two or more ultrasonic sensor and the control module that there is difference in height, wherein each ultrasonic sensor includes transmitting transducer and receiving transducer, described control module comprises single-chip microcomputer, launch output circuit, data storage circuitry, receive input circuit, telecommunication circuit and working power circuit, single-chip microcomputer is by launching output circuit stimulated emission transducers transmit ultrasonic waves, ultrasonic propagation to tested liquid level is reflected back receiving transducer and is converted into electric signal, through receiving input circuit, the corresponding detection port that two parts electric signal inputs to single-chip microcomputer respectively according to time series is carried out data processing again, draw the mistiming between each ultrasonic sensor, and calculate the real-time gas velocity of sound according to difference in height, sound velocity data is exported again through telecommunication circuit, and store data by memory circuit, required power supply is provided to each several part circuit by working power circuit.
Described ultrasonic sensor is provided with two.
Described difference in height is 0.1-0.2m.
The frequency of operation of described ultrasonic sensor is between 25KHZ to 2MHZ, and the frequency of operation of each ultrasonic sensor can be identical, also can and different.
The real time temperature parameter of gas can also be obtained while obtaining real-time gas sound velocity data result, and this temperature parameter is stored in data storage circuitry.
Described transmitting output circuit has isolating transformer, and this transmitting output circuit sends ultrasound wave by stimulated emission transducer after transformer isolation.
The baffle plate preventing acoustic short circuit is provided with between described transmitting transducer and receiving transducer.
The invention has the beneficial effects as follows: a kind of ultrasonic level gage of aerosphere type automatic calibration, comprise the two or more ultrasonic sensor and the control module that there is difference in height, during use, two or more ultrasonic sensor that there is difference in height simultaneously or interval send ultrasonic signal to liquid level, the mistiming of each ultrasonic sensor Received signal strength is obtained again by control module, the real-time gas velocity of sound can be calculated by mistiming and difference in height, and this gas sound velocity data is stored in control module, the correction of the real-time gas velocity of sound can be completed, now measure liquid level by ultrasonic sensor again, accuracy of detection and reliability are all very high, and correct and can automatically complete, use very convenient.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural plan of the present invention's specific embodiment.
Embodiment
With reference to Fig. 1, Fig. 1 is the structural arrangement schematic diagram of the present invention's specific embodiment, as shown in the figure, a kind of ultrasonic level gage of aerosphere type automatic calibration, comprise the two or more ultrasonic sensor and the control module that there is difference in height, wherein each ultrasonic sensor includes transmitting transducer and receiving transducer, described ultrasonic sensor is provided with two in the present embodiment, be respectively ultrasonic sensor 1 and ultrasonic sensor 2, described difference in height D is 0.1-0.2m, the frequency of operation of described ultrasonic sensor is between 25KHZ to 2MHZ, the frequency of operation of each ultrasonic sensor can be identical, also can and different, and between described transmitting transducer and receiving transducer, be provided with the baffle plate preventing acoustic short circuit, to improve the precision detected.
Described control module comprises single-chip microcomputer, launch output circuit, data storage circuitry, receive input circuit, telecommunication circuit and working power circuit, required power supply is provided to each several part circuit by working power circuit, single-chip microcomputer is by launching output circuit stimulated emission transducers transmit ultrasonic waves, ultrasonic propagation to tested liquid level is reflected back receiving transducer and is converted into electric signal, through receiving input circuit, the corresponding detection port that two parts electric signal inputs to single-chip microcomputer respectively according to time series is carried out data processing again, draw the mistiming between each ultrasonic sensor, and calculate the real-time gas velocity of sound according to difference in height D, sound velocity data is exported again through telecommunication circuit, and store sound velocity data by memory circuit, the correction of the gas velocity of sound can be completed, correction rate is fast, and automatically complete, arrange or adjustment without the need to staff, very easy to use, after drawing real-time gas sound velocity data, the height H of ultrasonic sensor to liquid level can be calculated according to the acoustic transit time of wherein any one ultrasonic sensor, again by the installation site of ultrasonic level gage, height can draw liquid level, accuracy of detection and reliability are all very high.
In the present embodiment, the real time temperature parameter of gas can also be obtained while obtaining real-time gas sound velocity data result, and this temperature parameter is stored in data storage circuitry, so that the later stage does data statistics and classification.
Further, in the present embodiment, described transmitting output circuit has isolating transformer, and this transmitting output circuit sends ultrasound wave by stimulated emission transducer after transformer isolation, to isolate the vibrations of subsequent ultrasonic ripple.
The single-chip microcomputer of the present embodiment adopts NEC single-chip microcomputer, model is uPD78F0881 (A) (78K0/FC2 series), this single-chip microcomputer is 8 single-chip microcomputers, 32K ROM, 1024Bytes inner high speed RAM, 1024Bytes external RAM, has 44 pin, there are two groups of UART mouth UART60 and UART61, a CAN transceiver interface.Also model can be adopted to be uPD78F0882 (48K ROM, 1024Bytes inner high speed RAM, 2048bytes external RAM) or model be the single-chip microcomputer of uPD78F0883 (60K ROM, 1024Bytes inner high speed RAM, 2048Bytes external RAM).
The PWM mouth of single-chip microcomputer exports the square wave of 40K frequency, square wave number 5, form multi-pulse excitation, 5V square wave is converted to 12V square wave by triode, IRF320 type metal-oxide-semiconductor is driven again by the anti-phase mosfet driver TPS2811 of two-way high speed, 12V square wave is boosted to 100V square wave by the transformer launched in output circuit, be added to the excitation of transmitting transducer two ends, namely launch output circuit and send ultrasound wave by stimulated emission transducer after transformer isolation, because transmitting transducer transformer is completely isolated, therefore the vibrations of subsequent ultrasonic ripple do not affect the echo reception of receiving transducer, measurement blind area reduces.Data storage circuitry adopts the routine data memory circuit of 24C02 chip.
Receive input circuit to be used for processing the ultrasound wave of reception, it comprises the amplifying circuit, filtering circuit, comparator circuit and the shaping circuit that are connected successively, hyperacoustic echoed signal is the sine wave signal of millivolt level 40K frequency, first amplify 400 times through the LM324 chip two-stage of amplifying circuit, enter the filtering circuit comprising MAX275 bandpass filter and form again, bandpass filter centre frequency 40K, bandwidth 2K.By filtered signal through IN60 detector diode, remove negative half part of noise and signal, then the LM324 chip entering amplifying circuit carries out third level magnify 20 and obtains signal RV6.The REF3212 chip of comparator circuit produces reference voltage, by the MAX903 chip of comparator circuit, signal RV6 and reference voltage are compared, draw signal RV7, signal RV7 enters 74LS122 chip, the further shaping of 74HC04 chip of shaping circuit more successively, and last signal INT enters single-chip microcomputer.
The telecommunication circuit of the present embodiment is used for that the process of control module single-chip microcomputer is calculated the liquid level data obtained and exports external unit to, this telecommunication circuit employing model is that the prime voltage stabilizing chip of 485 communication chips of ADM2483 isolates 485 chips, adopts BS0505-1W type DC-DC to obtain insulating power supply.Add Transient Suppression Diode protection above 485 buses and add discharge tube to protect, with two resistance and self-recoverage protective tube restriction bus current, forming isolation bus, preventing because short circuit, the bus big current that causes of thunderbolt are on the impact of level gauge system.
The working power circuit of the present embodiment comprises first power circuit of powering for whole level gauge system and the second source circuit for powering to single-chip microcomputer, telecommunication circuit, and two power circuits are existing normal power supplies input circuit.First power circuit provides 12V to power for whole liquid level gauge.First power circuit accesses outside 12V voltage mistake electric capacity after diode and carries out high and low frequency filtering, exports finally by inductance.Protection to element when diode can prevent input power from connecing anti-.The effect of inductance prevents from system power from suddenling change to cause change in voltage.Seal in the insurance of 500 milliamperes of self-recoverage in loop, systemic breakdown when preventing big current fault, and protect other element.
Because single-chip microcomputer and telecommunication circuit need a direct power supply, to aspire for stability for this part power circuit, temperature drift little, output has certain load capacity, quiescent dissipation is also low simultaneously, so the step-down chip of second source circuit adopts MC78LC05 chip, fan-out capability 80 milliamperes, quiescent dissipation 100 microamperes, the total current meeting single-chip microcomputer and telecommunication circuit can not more than the requirement of 50 milliamperes.
The present embodiment also can arrange electronic switching circuit, for being switched on or switched off the selectivity of transmitting output, amplification, filtering, shaping circuit subelement power supply, can adopting existing conventional electronic switch circuit, not enumerating.
Above better enforcement of the present invention is illustrated; certainly; the present invention can also adopt form different from the embodiment described above; the equivalent conversion that those of ordinary skill in the art do under the prerequisite without prejudice to spirit of the present invention or change accordingly, all should belong in protection scope of the present invention.
Claims (7)
1. the ultrasonic level gage of an aerosphere type automatic calibration, it is characterized in that: comprise the two or more ultrasonic sensor and the control module that there is difference in height, wherein each ultrasonic sensor includes transmitting transducer and receiving transducer, described control module comprises single-chip microcomputer, launch output circuit, data storage circuitry, receive input circuit, telecommunication circuit and working power circuit, single-chip microcomputer is by launching output circuit stimulated emission transducers transmit ultrasonic waves, ultrasonic propagation to tested liquid level is reflected back receiving transducer and is converted into electric signal, through receiving input circuit, the corresponding detection port that two parts electric signal inputs to single-chip microcomputer respectively according to time series is carried out data processing again, draw the mistiming between each ultrasonic sensor, and calculate the real-time gas velocity of sound according to difference in height, sound velocity data is exported again through telecommunication circuit, and store data by memory circuit, required power supply is provided to each several part circuit by working power circuit.
2. the ultrasonic level gage of a kind of aerosphere type automatic calibration according to claim 1, is characterized in that: described ultrasonic sensor is provided with two.
3. the ultrasonic level gage of a kind of aerosphere type automatic calibration according to claim 2, is characterized in that: described difference in height is 0.1-0.2m.
4. the ultrasonic level gage of a kind of aerosphere type automatic calibration according to claim 1, it is characterized in that: the frequency of operation of described ultrasonic sensor is between 25KHZ to 2MHZ, the frequency of operation of each ultrasonic sensor can be identical, also can and different.
5. the ultrasonic level gage of a kind of aerosphere type automatic calibration according to claim 1, it is characterized in that: the real time temperature parameter that can also obtain gas while obtaining real-time gas sound velocity data result, and this temperature parameter is stored in data storage circuitry.
6. the ultrasonic level gage of a kind of aerosphere type automatic calibration according to claim 1, it is characterized in that: described transmitting output circuit has isolating transformer, this transmitting output circuit sends ultrasound wave by stimulated emission transducer after transformer isolation.
7. the ultrasonic level gage of a kind of aerosphere type automatic calibration according to claim 1, is characterized in that: be provided with the baffle plate preventing acoustic short circuit between described transmitting transducer and receiving transducer.
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| CN201410493045.7A CN104266715A (en) | 2014-09-24 | 2014-09-24 | Automatic calibration gas medium ultrasonic level gauge |
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| CN201410493045.7A CN104266715A (en) | 2014-09-24 | 2014-09-24 | Automatic calibration gas medium ultrasonic level gauge |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547418A (en) * | 2015-12-07 | 2016-05-04 | 中国电力科学研究院 | Detection device and detection method for optical fiber oil level sensor performance used for transformer |
| CN107688321A (en) * | 2017-08-31 | 2018-02-13 | 济南大学 | A kind of object position automatic measuring and control method |
| CN108168653A (en) * | 2017-12-13 | 2018-06-15 | 太原理工大学 | The ultrasonic level monitoring device of transducer impedance Adaptive matching |
| CN108652452A (en) * | 2018-08-21 | 2018-10-16 | 深圳市九扬智能科技有限公司 | It is a kind of can be automatically according to the automatic outletting system of cup amount |
| CN109341819A (en) * | 2018-10-30 | 2019-02-15 | 上海云鱼智能科技有限公司 | Self-correction ultrasonic measuring device and its measurement method |
| CN112881727A (en) * | 2021-01-13 | 2021-06-01 | 湖南大学 | Automatic calibration method of liquid processor for accurate liquid adding and constant volume |
| WO2022120624A1 (en) * | 2020-12-09 | 2022-06-16 | 中国科学院声学研究所南海研究站 | Ultrasonic rainfall measurement system capable of automatic triggering and self-calibration |
-
2014
- 2014-09-24 CN CN201410493045.7A patent/CN104266715A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547418A (en) * | 2015-12-07 | 2016-05-04 | 中国电力科学研究院 | Detection device and detection method for optical fiber oil level sensor performance used for transformer |
| CN107688321A (en) * | 2017-08-31 | 2018-02-13 | 济南大学 | A kind of object position automatic measuring and control method |
| CN108168653A (en) * | 2017-12-13 | 2018-06-15 | 太原理工大学 | The ultrasonic level monitoring device of transducer impedance Adaptive matching |
| CN108652452A (en) * | 2018-08-21 | 2018-10-16 | 深圳市九扬智能科技有限公司 | It is a kind of can be automatically according to the automatic outletting system of cup amount |
| CN109341819A (en) * | 2018-10-30 | 2019-02-15 | 上海云鱼智能科技有限公司 | Self-correction ultrasonic measuring device and its measurement method |
| WO2022120624A1 (en) * | 2020-12-09 | 2022-06-16 | 中国科学院声学研究所南海研究站 | Ultrasonic rainfall measurement system capable of automatic triggering and self-calibration |
| US11947072B2 (en) | 2020-12-09 | 2024-04-02 | Hainan Acoustics Laboratory, Institute Of Acoustics, Chinese Academy Of Sciences | Automatic trigger and self-calibration ultrasonic rain measurement system |
| CN112881727A (en) * | 2021-01-13 | 2021-06-01 | 湖南大学 | Automatic calibration method of liquid processor for accurate liquid adding and constant volume |
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Application publication date: 20150107 |