CN105319266A - Ultrasonic liquid concentration phase-sensitive detecting method and device - Google Patents
Ultrasonic liquid concentration phase-sensitive detecting method and device Download PDFInfo
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- CN105319266A CN105319266A CN201510690680.9A CN201510690680A CN105319266A CN 105319266 A CN105319266 A CN 105319266A CN 201510690680 A CN201510690680 A CN 201510690680A CN 105319266 A CN105319266 A CN 105319266A
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Abstract
The invention relates to an ultrasonic liquid concentration phase-sensitive detecting method. The method includes the following steps of firstly, connecting a system, wherein all parts of a phase-sensitive detecting device are completely connected and powered on through data lines; secondly, conducting calibrated measurement, wherein a series of sample solutions with known concentrations and temperatures are prepared, the ultrasonic signal phase differences of the sample solutions are obtained through the phase-sensitive detecting device, fitting is conducted on the ultrasonic signal phase differences and temperatures of the sample solutions under all the concentrations, and the calibrated curve set of the sample solutions is obtained; thirdly, conducting concentration measurement, wherein phase differences and temperatures of solutions to be detected are obtained and sent to an embedded computer, and the concentrations of the solutions to the detected are obtained according to the calibrated curve set and displayed on a display screen. Compared with the prior art, the method has the advantages of being high in measurement accuracy, suitable for high-sound-attenuation liquid and the like.
Description
Technical field
The present invention relates to the detection technique field of strength of fluid, especially relate to a kind of ultrasonic solution bulk concentration phase-sensitive detection method and device.
Background technology
The concentration of liquid is the very important parameter characterizing characteristics of liquids, and along with the development of modern science and technology, the measuring accuracy for liquid solution concentration proposes more and more higher requirement.The method measuring strength of fluid has multiple, but by measuring acoustic liquid feature, carry out the method for indirect inspection strength of fluid, have without the need to sampling, simple to operate, speed is fast and precision is high, harmless and can realize on-line continuous and detect advantage, become strength of fluid and measured one of important means.Ultrasound wave concentration measuring method usually employing sound time method, it launches ultrasonic signal by emission sensor, and propagate fixed range in the tested liquid of ultrasonic delivery, recycling receiving sensor receives through the ultrasonic signal after liquid.By directly measuring the hyperacoustic velocity of sound of hyperacoustic travel-time indirect inspection, thus carry out the measurement of strength of fluid.The key that during sound, method is measured is time measurement, and the height of its measuring accuracy determines primarily of the measuring accuracy of ultrasonic propagation time.
At present, sound transit-time measurement system generally adopts single-chip microcomputer to be responsible for producing ultrasound wave transmitting drive singal as system core chip, by zero passage detection, receive ultrasound echo signal, realize the timing (time delay of deduction hardware) of the time that ultrasound wave is getted in a liquid.The running frequency of measure system based on MCU does not generally reach the optimal frequency 40MHz being used in ultrasonic sensor in liquid measure, therefore no matter be adopt which kind of mode in timer mode or counter type, the frequency of sensor actuation signal and precision are all limited, require that its measuring accuracy of gap is limited to adopted ultrasonic frequency with the measuring accuracy of theory, frequency more high precision is larger, but its acoustic attenuation also increases with frequency and increases, the such as Haiti sedimentary measurement large to decay can not ensure measuring accuracy by raising ultrasound emission frequency.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and a kind of ultrasonic solution bulk concentration phase-sensitive detection method and device are provided.
Object of the present invention can be achieved through the following technical solutions:
A kind of ultrasonic solution bulk concentration phase-sensitive detection method, the method comprises the following steps:
1) connected system: by data line, each several part of phase-sensitive detection device is connected complete, and be energized;
2) calibration measurements: the sample solution preparing a series of concentration known and temperature, the ultrasonic signal phase differential of sample solution is obtained by phase-sensitive detection device, and matching is carried out to the ultrasonic signal phase differential of sample solution under all concentration and temperature, obtain the calibration curve collection of sample solution;
3) measurement of concetration: the phase differential and the temperature that obtain solution to be checked, and the ultrasonic signal phase differential of solution to be checked and temperature are sent in embedded computer, obtain the concentration of solution to be checked according to calibration curve collection, and show on a display screen.
Described step 2) specifically comprise the following steps:
21) by least square method, matching is carried out to the temperature of variable concentrations sample solution and ultrasonic signal phase differential, obtain the matched curve that many variable concentrations are corresponding;
22) matched curve corresponding for many variable concentrations is integrated into calibration curve collection, and calibration curve collection is stored in embedded computer.
Described step 3) specifically comprise the following steps:
31) ultrasonic signal phase differential and the temperature of solution to be checked is recorded respectively by phase-sensitive detection device;
32) according to ultrasonic signal phase differential and the temperature data of the solution to be checked recorded, judge whether this ultrasonic signal phase differential and temperature data drop in the matched curve of calibration curve collection, if, then directly read corresponding solution concentration, if not, then by linear interpolation method, calculate the concentration obtaining solution to be checked according to known adjacent matched curve data.
A kind of ultrasonic solution bulk concentration phase-sensitive detection device, this device comprises the integrative ultrasonic detection probe, concentration detector and the embedded computer that connect successively, described integrative ultrasonic detection probe comprises stainless steel stent and is arranged on emission sensor, receiving sensor and the temperature sensor on stainless steel stent, and described emission sensor, receiving sensor are connected with concentration detector respectively by signal wire with temperature sensor.
Described concentration detector comprises ultrasound wave emitting head, temperature detection amplifier, ultrasound wave reception amplifier and signal processor, described ultrasound wave emitting head is connected with emission sensor, described temperature detection amplifier is connected with temperature sensor, described ultrasound wave reception amplifier is connected with receiving sensor, and described ultrasound wave emitting head, temperature detection amplifier, ultrasound wave reception amplifier are connected with signal processor respectively.
Described embedded computer is connected with concentration detector by USB interface.
Described stainless steel stent is U-shaped support, and described temperature sensor is arranged on U-shaped support inside bottom, and described emission sensor and receiving sensor are oppositely arranged on U-shaped support madial wall.
Compared with prior art, the present invention has the following advantages:
One, measuring accuracy is high: adopt phase-sensitive detection method, and determined the slight change of strength of fluid by the phase place change of measuring transonic, the measuring accuracy of phase place is high, and its measurement of concetration precision wants high compared with counting method during sound.
Two, the liquid that acoustic attenuation is large is applicable to: comprise the liquid of gas-liquid mixed, mud, marine bottom sediment etc., the measuring accuracy of phase place is not with adopted ultrasound works frequency change, even if the low frequency ultrasound being operated in tens kilo hertzs still has higher measuring accuracy.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
The structural representation of the integrated ultrasonic inspection probe of Fig. 2.
Fig. 3 is the structural representation of concentration detector.
Fig. 4 is strength of fluid phase-sensitive detection principle schematic diagram.
Wherein, 1, integrative ultrasonic detection probe, 11, stainless steel stent, 12, emission sensor, 13, receiving sensor, 14, temperature sensor, 2, concentration detector, 21, ultrasound wave emitting head, 22, temperature detection amplifier, 23, ultrasound wave reception amplifier, 24, signal processor, 3, embedded computer.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1:
Utilize a kind of ultrasonic solution bulk concentration phase-sensitive detection device, the distance between transmitting, receiving transducer is 20mm, and frequency probe is 1MHz, and detect the phase place change of pure water under different water temperature, testing result is as table 1.
Phase place change under the different water temperature of table 1 pure water
| Water temperature (DEG C) | 20 | 21 | 22 | 23 | 24 | 25 |
| Phase place (rad) | -0.6746 | -0.6296 | -0.5884 | -0.5469 | -0.5098 | -0.4697 |
| Water temperature (DEG C) | 26 | 27 | 28 | 29 | 30 | 31 |
| Phase place (rad) | -0.4356 | -0.3999 | -0.3623 | -0.3289 | -0.2986 | -0.2661 |
In order to verification system measuring accuracy, adopt and compare with the theoretical velocity standard of international ultrasound wave in pure water.Table 2 is the theoretical velocity of sound table of international pure water.
The theoretical velocity of sound table of table 2 pure water
In order to table 1 measurement data and table 2 international standard being compared, when table 1 and table 2 data are all changed into sound by us, as table 3 and table 4.
Show during table 3 pure water theory sound
Show during table 4 pure water experiment sound
The data of MATLAB instrument his-and-hers watches 3 and table 4 are utilized to carry out curve fitting.When in fit equation, t is pure water theory sound, unit μ s; t
0during for pure water experiment sound, unit μ s; T is fluid to be measured temperature, unit DEG C.
Table 3 pure water gross data fit equation is:
t＝-2.09×10
-10×T
5+5.432×10
-8×T
4-7.279×10
-6×T
3+7.571×10
-4×T
2(1)
-0.05107×T+14.26
Table 4 pure water fitting experimental data equation is:
t
0＝-3.361×10
-8×T
5+7.707×10
-6×T
4-5.759×10
-4×T
3+0.01982×T
2(2)
-0.3511×T+4.003
The absolute error of corresponding temperature point is calculated, as table 5 according to equation 1 and equation 2.
Table 5 phase-sensitive detection pure water absolute error
As can be seen from Table 5, absolute error is measured without any rule.The maximal value of error appears at about 20 DEG C, and maximum absolute error is 1.73 × 10
-3μ s.
The absolute error that method when phase-sensitive detection pure water absolute error and conventional sound detects pure water compared, result is as table 6.
During table 6 sound, method and phase sensitivity method detect pure water absolute error and compare
The measuring error of phase sensitivity method is less relative to the measuring error of method during sound as can be seen from Table 6.When during sound, method maximum error value appears at 20 DEG C, maximum error is 3.98 × 10
-3μ s.The half of method when visible phase sensitivity method maximum error is only sound.Therefore phase sensitivity method measuring error is little, and measuring accuracy is high.
Embodiment 2:
Utilize a kind of ultrasonic solution bulk concentration phase-sensitive detection device, the distance between transmitting, receiving transducer is 20mm, and frequency probe is 1MHz, and detect the phase place change of polyglycol liquid under different water temperature of 5g/L, 10g/L, testing result is as table 7 and table 8.
Table 75g/L solution measurement data
Table 810g/L solution measurement data
Utilize MATLAB instrument that the data of table 7 and table 8 are carried out fitting of a polynomial, in fit equation, α is phase differential, unit rad; T is fluid to be measured temperature, unit DEG C.
5g/L polyglycol solution fit equation:
α
5＝1.32×10
-7×T
5-2.23×10
-5×T
4+1.427×10
-3×T
3-0.04445×T
2(3)
+0.7196×T-5.455
α
5represent the phase differential of 5g/L polyglycol solution fit equation.
10g/L polyglycol solution fit equation:
α
10＝5.486×10
-7×T
5-7.481×10
-5×T
4+4.055×10
-3×T
3-0.1097×T
2(4)
+1.522×T-9.261
α
10represent the phase differential of 5g/L polyglycol solution fit equation.
Curve done by fit equation 3 and 4 is the calibration curve of variable concentrations polyglycol solution, as concentration N0 in Fig. 4 and N1 profile.Fig. 4 shows: different liquids concentration has specific temperature-phase calibration curve, just can carry out measurement of concetration according to these calibration curves.Concrete measuring process:
1. record the ultrasonic signal phase differential p (T) of liquid variable concentrations and the data of temperature T by phase-sensitive detection device;
2. utilize least square method to carry out matching to the temperature of variable concentrations sample solution and ultrasonic signal phase differential, obtain the matched curve that many variable concentrations are corresponding, as concentration N0 in Fig. 4 and N1 profile;
3. matched curve corresponding for many variable concentrations is integrated into calibration curve collection, and calibration curve collection is stored in embedded computer;
4. recorded ultrasonic signal phase differential p (T) and the temperature T of solution to be checked by phase-sensitive detection device, whether this data point of computing machine automatic decision drops in the matched curve of calibration curve collection, if so, then directly reads corresponding solution concentration; If not, then by linear interpolation method, calculate the concentration obtaining solution to be checked according to known adjacent calibration curve data.As Fig. 4, suppose that the measurement data points of solution to be measured is 0, now temperature is T0, and its phase differential is between adjacent 2 pN0 and pN1.When two N0 and N1 calibration curve spacings are very little, according to linear interpolation principle, can think that the phase difference variable between 2 pN0 and pN1 turns to linear homogeneous change, equal indicative segmentation can be carried out, the corresponding out of phase of each cut-point obtained after segmentation is poor, also be corresponding each variable concentrations, its concentration value is:
N
x＝N1+x(N0-N1)/n(5)
Wherein: Nx is the concentration of cut-point x; N is isodisperse, according to measuring accuracy and N0 and N1 calibration curve spacing choose reasonable, is constant; X is cut-point, and value is 0 ~ n.During actual detection, select suitable x just can obtain the concentration of the measurement data points 0 of solution to be measured.
Claims (7)
1. a ultrasonic solution bulk concentration phase-sensitive detection method, it is characterized in that, the method comprises the following steps:
1) connected system: by data line, each several part of phase-sensitive detection device is connected complete, and be energized;
2) calibration measurements: the sample solution preparing a series of concentration known and temperature, the ultrasonic signal phase differential of sample solution is obtained by phase-sensitive detection device, and matching is carried out to the ultrasonic signal phase differential of sample solution under all concentration and temperature, obtain the calibration curve collection of sample solution;
3) measurement of concetration: the phase differential and the temperature that obtain solution to be checked, and the ultrasonic signal phase differential of solution to be checked and temperature are sent in embedded computer, obtain the concentration of solution to be checked according to calibration curve collection, and show on a display screen.
2. a kind of ultrasonic solution bulk concentration phase-sensitive detection method according to claim 1, is characterized in that, described step 2) specifically comprise the following steps:
21) by least square method, matching is carried out to the temperature of variable concentrations sample solution and ultrasonic signal phase differential, obtain the matched curve that many variable concentrations are corresponding;
22) matched curve corresponding for many variable concentrations is integrated into calibration curve collection, and calibration curve collection is stored in embedded computer.
3. a kind of ultrasonic solution bulk concentration phase-sensitive detection method according to claim 1, is characterized in that, described step 3) specifically comprise the following steps:
31) ultrasonic signal phase differential and the temperature of solution to be checked is recorded respectively by phase-sensitive detection device;
32) according to ultrasonic signal phase differential and the temperature data of the solution to be checked recorded, judge whether this ultrasonic signal phase differential and temperature data drop in the matched curve of calibration curve collection, if, then directly read corresponding solution concentration, if not, then by linear interpolation method, calculate the concentration obtaining solution to be checked according to known adjacent matched curve data.
4. one kind realizes the pick-up unit of the ultrasonic solution bulk concentration phase-sensitive detection method as described in any one of claim 1-3, it is characterized in that, this device comprises the integrative ultrasonic detection probe (1) connected successively, concentration detector (2) and embedded computer (3), described integrative ultrasonic detection probe (1) comprises stainless steel stent (11) and is arranged on the emission sensor (12) on stainless steel stent (11), receiving sensor (13) and temperature sensor (14), described emission sensor (12), receiving sensor (13) is connected with concentration detector (2) respectively by signal wire with temperature sensor (14).
5. a kind of ultrasonic solution bulk concentration phase-sensitive detection device according to claim 4, it is characterized in that, described concentration detector (2) comprises ultrasound wave emitting head (21), temperature detection amplifier (22), ultrasound wave reception amplifier (23) and signal processor (24), described ultrasound wave emitting head (21) is connected with emission sensor (12), described temperature detection amplifier (22) is connected with temperature sensor (14), described ultrasound wave reception amplifier (23) is connected with receiving sensor (13), described ultrasound wave emitting head (21), temperature detection amplifier (22), ultrasound wave reception amplifier (23) is connected with signal processor (24) respectively.
6. a kind of ultrasonic solution bulk concentration phase-sensitive detection device according to claim 4, it is characterized in that, described embedded computer (3) is connected with concentration detector (2) by USB interface.
7. a kind of ultrasonic solution bulk concentration phase-sensitive detection device according to claim 4, it is characterized in that, described stainless steel stent (11) is U-shaped support, described temperature sensor (14) is arranged on U-shaped support inside bottom, and described emission sensor (12) and receiving sensor (13) are oppositely arranged on U-shaped support madial wall.
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| CN108872034A (en) * | 2018-06-01 | 2018-11-23 | 广西师范大学 | A kind of powder granularity detection device and detection method based on sedimentation |
| CN109765293A (en) * | 2017-11-10 | 2019-05-17 | 株式会社迪思科 | Detector, liquid provide device and protective film coating unit |
| CN110100162A (en) * | 2016-12-22 | 2019-08-06 | 文塔纳医疗系统公司 | System and method for sample process |
| CN112840225A (en) * | 2018-10-12 | 2021-05-25 | 佩里森股份有限公司 | Antenna housing measuring system and method |
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