CN102353612B - Resonant tuning fork liquid density sensor with piezoelectric actuation and piezoelectric detection - Google Patents
Resonant tuning fork liquid density sensor with piezoelectric actuation and piezoelectric detection Download PDFInfo
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- CN102353612B CN102353612B CN 201110183489 CN201110183489A CN102353612B CN 102353612 B CN102353612 B CN 102353612B CN 201110183489 CN201110183489 CN 201110183489 CN 201110183489 A CN201110183489 A CN 201110183489A CN 102353612 B CN102353612 B CN 102353612B
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Abstract
The invention discloses a resonant tuning fork liquid density sensor with piezoelectric actuation and piezoelectric detection, comprising a tuning fork body, a clamped body, a piezoelectric actuator, a piezoelectric vibration pickup, and a temperature sensor, wherein, the piezoelectric actuator and the piezoelectric vibration pickup are arranged on the clamped body, the generated alternating force is transmitted to the tuning fork body by the piezoelectric actuator to let the tuning fork body produce simple harmonic vibration with intrinsic frequency itself; when immersing the tuning fork body in a liquid under test, the additional mass of the tuning fork body changes so as to let the vibration frequency of the tuning fork body change; by picking up the vibration signal with the piezoelectric vibration pickup, the detection of the vibration frequency of the tuning fork body is realized; because the vibration frequency of the tuning fork body is a monotone function of the liquid density, thus the real-time on-line detection of the liquid density is realized; and the temperature sensor is arranged on the clamped body for real-time detection of the temperature of the liquid under test, and is used for compensating the variation of the elastic modulus of the tuning fork body. According to the invention, the high precision on-line detection of densities of various liquids at different temperature can be realized.
Description
Technical field
The present invention relates to a kind of resonant tuning fork liquid density sensor of piezoelectric excitation piezoelectric detection, it is the accurate digital sensor of a kind of high precision resonant mode, belong to test and measuring instrument field, be used for the high precision online measuring fluid density, its resonant element is the tuning fork body.
Background technology
Density is the important physical character of liquid, and measuring fluid density is that all conglomeraties such as medicine, food, petrochemical complex realize one of important means of production quality control.Therefore, the measurement of fluid density has very important meaning to enterprise.Traditional liquid density measurement method, such as balance weighing method, density bottle method, overstatement method etc., these class methods mainly are manual operation, artificial reading, its measuring process is complicated, large, the consuming time length of sampling quantity, and be subject to the impact of human factor, so can only be used for discrete measurement occasion, physical quantity can not be converted to the on-line measurement of intuitively numeral demonstration of electric signal and then realization and production run, therefore can't realize the robotization of production run control.
Because the measurement of fluid density is easy to be subject to the impact of temperature, pressure and liquid viscosity, therefore when measuring fluid density, also need accurately to measure its temperature, pressure and viscosity.The resonant type liquid density survey sensor not only simple in structure, size is little, lightweight, wearing and tearing are little, and reliability is high, measuring accuracy is high, efficient is high, response is fast.At present, there have been a lot of scientific research personnel to measure fluid density at the research and utilization resonance principle abroad, 7828 type density measure sensors such as Britain Solartron Electronics Co., Ltd., Japan's Henghe motor is made the portable F D77 type of institute, the resonant mode density sensor of the national production such as the DA-101 type of Kyoto company and the U.S., Switzerland, Germany, Austria.And China only has only a few resonant mode density sensor product, and the method that adopts mainly contains vibration string method, vibrating tube method, vibration embrane method and vibrating barrel method.Wherein, vibration string method complex structure, the mechanical vibration that are subject to environment and liquid flow affect, and precision is lower; It is comparatively general that the vibrating tube method is used, but its flow is little, and the vibration shape is asymmetric, and vibration frequency is stable not; The work of vibration embrane method is difficult for stable, poor reliability; The vibrating barrel method is very high to the requirement of manufacturing process, and the vibrating barrel wall unevenness is even easily to make its vibration shape asymmetric, and vibration frequency is unstable, and liquid viscosity can affect the frequency of vibrating barrel.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, the resonant tuning fork liquid density sensor of a kind of measuring accuracy height, good stability, reliability is high, simple in structure, volume is little, low in energy consumption a kind of piezoelectric excitation piezoelectric detection is provided.
Technical solution of the present invention: a kind of resonant tuning fork liquid density sensor of piezoelectric excitation piezoelectric detection comprises: tuning fork body, solid support body, piezoelectric driving systen, piezoelectric vibration pickup and temperature sensor; Piezoelectric driving systen and piezoelectric vibration pickup all are mounted on the solid support body with the orthogonal thereto angle of tuning fork body; Piezoelectric driving systen is transmitted to the tuning fork body with the alternating force that produces by solid support body, and piezoelectric vibration pickup picks up the detection of the vibration frequency realization tuning fork body vibration frequency of tuning fork body; The vibration frequency of tuning fork body and fluid density are dull funtcional relationships, have therefore realized the real-time online measuring of fluid density; Temperature sensor is mounted on the solid support body, detects in real time the fluid to be measured temperature, is used for the elastic modulus change of compensation tuning fork body.
Described tuning fork body and solid support body adopt 3J53 constant elastic alloy or 316L stainless steel to process through finishing is integrated, and it is the relief groove transition of 0.5mm that radius is adopted in both junctions, to eliminate stress on the impact of tuning fork body vibration frequency.
Described piezoelectric driving systen and piezoelectric vibration pickup all are mounted on the solid support body with the orthogonal thereto angle symmetry of tuning fork body, and the central axis distance of piezoelectric driving systen and the solid support body of piezoelectric vibration pickup distance is 0.5 times of solid support body internal diameter.
Principle of the present invention: according to the resonance principle of sensitive element, when the tuning fork body contacts with fluid to be measured, the additional mass of tuning fork body changes, cause its vibration frequency to change, the vibration frequency of tuning fork body and fluid density are dull funtcional relationships, reflect the density of fluid to be measured with the variation of frequency.
The present invention's advantage compared with prior art is:
(1) the present invention is the accurate digital sensor of a kind of high precision resonant mode, and measuring accuracy is high, good stability, and reliability is high, and simple in structure, volume is little, and is low in energy consumption, can on-line continuous measures the density of various liquid under the different temperatures;
(2) the present invention adopts the tuning fork body as resonant element, and the tuning fork body adopts the periphery fixed structure, and namely the structure of tuning fork body and solid support body is that one processes, and the vibration shape of tuning fork body is simple, is not easy to cause the saltus step of the vibration shape, and is reliable and stable during work;
(3) the present invention adopts piezoelectric excitation and piezoelectric detection, and excitation and detection mode are simple, and the volume of piezoelectric driving systen and piezoelectric vibration pickup is little, simple in structure, is convenient to mount;
(4) piezoelectric driving systen of the present invention and piezoelectric vibration pickup are mounted on solid support body inside perpendicular to the direction symmetry of tuning fork body, the central axis distance of the solid support body of distance is 0.5 times of solid support body internal diameter, detected like this signal is stronger, and the easy circuit of whole testing process is realized; When carrying out liquid density measurement, piezoelectric driving systen and piezoelectric vibration pickup and fluid to be measured are not in contact with one another, so do not need earth leakage protection.
(5) resonant tuning fork liquid density sensor of piezoelectric excitation piezoelectric detection of the present invention can be used for the high precision on-line continuous measurement of fluid density in the commercial production, is beneficial to the robotization control that realizes in the production run.
Description of drawings
Fig. 1 is Standard synoptic diagram of the present invention;
Fig. 2 is structure vertical view of the present invention;
Fig. 3 is the structural representation of tuning fork body of the present invention and solid support body;
Fig. 4 is the structural representation of piezoelectric driving systen of the present invention;
Fig. 5 is the structural representation of piezoelectric vibration pickup of the present invention;
Fig. 6 is the structural representation of temperature sensor of the present invention.
Embodiment
Shown in Fig. 1-6, the resonant tuning fork liquid density sensor of piezoelectric excitation piezoelectric detection of the present invention is comprised of tuning fork body 1, solid support body 2, piezoelectric driving systen 3, piezoelectric vibration pickup 4, temperature sensor 5.
Such as Fig. 2, Fig. 4, Fig. 5, shown in Figure 6, piezoelectric driving systen 3, piezoelectric vibration pickup 4 and temperature sensor 5 all are mounted on the solid support body 2.Piezoelectric driving systen 3 and piezoelectric vibration pickup 4 are mounted on the solid support body 2 perpendicular to the direction symmetry of tuning fork body 1, and the central axis distance of the solid support body 2 of distance is 0.5 times of solid support body internal diameter respectively.
As shown in Figure 3, the structure of tuning fork body 1 and solid support body 2 is that one processes, and to adopt radius be that the relief groove transition of 0.5mm is to eliminate stress on the impact of tuning fork body 1 vibration frequency.Tuning fork body 1 and solid support body 2 are most important parts of this sensor, and it is made material and adopts 3J53 constant elastic alloy or 316L stainless steel, and their crudy directly affects the performance of sensor, so adopt method for finishing manufactured to be processed into type.
The course of work of the present invention: the natural frequency of in air, measuring the tuning fork body, produce a sinusoidal signal by circuit, piezoelectric driving systen has the frequency vibration of certain bandwidth and the alternation piezoelectric forces that produces is transmitted to the tuning fork body by solid support body with certain, make the tuning fork body according to self natural frequency generation simple harmonic oscillation, then picked up the vibration frequency of tuning fork body by piezoelectric vibration pickup, and signal is outputed in the circuit, and then be input to piezoelectric driving systen, so just formed the excitation pick-up system of a closed loop, because tuning fork body body has the function of frequency-selecting, last tuning fork body is with the natural frequency vibration of self.When measuring fluid density, when the tuning fork body is immersed in the fluid to be measured, owing to piezoelectric element is not contacted mutually with liquid, so liquid can not affect the normal operation of piezoelectric element.Variation has occured with the additional mass that the tuning fork body contacts rear tuning fork body fully in liquid, and the natural frequency of tuning fork body vibration can change, and picks up the detection that this vibration signal is realized tuning fork body vibration frequency by piezoelectric vibration pickup.The vibration frequency of tuning fork body and fluid density are dull funtcional relationships, so can obtain the density of liquid.
The non-elaborated part of the present invention belongs to those skilled in the art's known technology.
Claims (2)
1. the resonant tuning fork liquid density sensor of a piezoelectric excitation piezoelectric detection is characterized in that comprising: solid support body (2), piezoelectric driving systen (3), piezoelectric vibration pickup (4) and the temperature sensor (5) of tuning fork body (1), circle; Piezoelectric driving systen (3) and piezoelectric vibration pickup (4) all are mounted on the solid support body (2) with the orthogonal thereto angle of tuning fork body (1); Piezoelectric driving systen (3) is transmitted to tuning fork body (1) with the alternating force that produces by solid support body (2), and piezoelectric vibration pickup (4) picks up the detection of vibration frequency realization tuning fork body (1) vibration frequency of tuning fork body (1); The vibration frequency of tuning fork body (1) and fluid density are dull funtcional relationships, have therefore realized the real-time online measuring of fluid density; Temperature sensor (5) is mounted on the solid support body (2), detects in real time the fluid to be measured temperature, is used for the elastic modulus change of compensation tuning fork body (1); Described piezoelectric driving systen (3) and piezoelectric vibration pickup (4) all are mounted on the solid support body (2) with the orthogonal thereto angle symmetry of tuning fork body (1), and the central axis distance of piezoelectric driving systen (3) and the solid support body (2) of piezoelectric vibration pickup (4) distance is 0.5 times of solid support body (2) internal diameter.
2. the resonant tuning fork liquid density sensor of piezoelectric excitation piezoelectric detection according to claim 1, it is characterized in that: described tuning fork body (1) and solid support body (2) adopt 3J53 constant elastic alloy or 316L stainless steel to process through finishing is integrated, it is the relief groove transition of 0.5mm that radius is adopted in both junctions, to eliminate stress on the impact of tuning fork body (1) vibration frequency.
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| CN 201110183489 CN102353612B (en) | 2011-07-01 | 2011-07-01 | Resonant tuning fork liquid density sensor with piezoelectric actuation and piezoelectric detection |
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| CN102798585B (en) * | 2012-08-30 | 2015-05-20 | 上海河口海岸科学研究中心 | Large-size temperature-controllable automatic stirring sedimentation compaction test device and test method thereof |
| CN104181079B (en) * | 2014-09-04 | 2017-02-22 | 北京天辰博锐科技有限公司 | Density sensor |
| CN104502235B (en) * | 2014-12-15 | 2018-02-16 | 中国航空工业集团公司北京长城航空测控技术研究所 | Self-closing oil viscosity detecting line sensor and its method |
| CN104597121B (en) * | 2015-01-25 | 2018-09-25 | 华北水利水电大学 | A kind of the Yellow River silt content detecting system using audio resonance principle |
| CN105092413A (en) * | 2015-08-19 | 2015-11-25 | 西安傲蓝机电科技有限公司 | Oil feature sensor module |
| CN105987859B (en) * | 2016-04-22 | 2018-07-17 | 纳智源科技（唐山）有限责任公司 | The measuring device and method of fluid density |
| CN106153531A (en) * | 2016-08-25 | 2016-11-23 | 中国工程物理研究院总体工程研究所 | Liquid material vibration damping based on cantilever beam response, shock isolation performance test device |
| CN106840309A (en) * | 2017-04-01 | 2017-06-13 | 伊玛精密电子（苏州）有限公司 | Intelligent miniature tuning fork type level meter |
| CN109115653B (en) * | 2018-09-26 | 2023-03-28 | 重庆科技学院 | Tuning fork resonance crude oil water content measuring device and measuring method thereof |
| CN109141618A (en) * | 2018-10-11 | 2019-01-04 | 武汉科技大学 | A kind of steel structure bolt loosening detection robot |
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| JPH1194726A (en) * | 1997-09-19 | 1999-04-09 | Riken Corp | Tuning fork-type piezoelectric vibrator |
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