CN205449731U - Quartzy tuning fork sensor - Google Patents
Quartzy tuning fork sensor Download PDFInfo
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- CN205449731U CN205449731U CN201521116435.9U CN201521116435U CN205449731U CN 205449731 U CN205449731 U CN 205449731U CN 201521116435 U CN201521116435 U CN 201521116435U CN 205449731 U CN205449731 U CN 205449731U
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Abstract
The utility model discloses a quartzy tuning fork sensor, including quartzy tuning fork, excitation unit, measuring unit, signal converting unit, little the control unit and power. Quartzy tuning fork sensor passes through the quartzy tuning fork of little the control unit control excitation unit drive and produces stable oscillation, measuring unit acquisition "Frequency" and the impedance that corresponds to sending it and exporting little the control unit after signal converting unit changes, little the control unit calculates await measuring density, the viscosity numerical value of medium, thereby judges the quality of the medium that awaits measuring, has realized the real -time supervision to the medium quality that awaits measuring, simultaneously it is accurate that quartzy tuning fork sensor has the monitoring, the high characteristics of sensitivity.
Description
Technical field
This utility model relates to sensor technical field, particularly relates to a kind of Quartz tuning fork sensor.
Background technology
Lubricating oil, as one of four big oil products, is the important goods involved the interests of the state and the people, is widely used in the industrial circles, the especially application with automobile industry such as automobile, metallurgy, chemical industry, electric power the most typical.Lubricating oil, as the lubricant medium of electromotor, is used for reducing surface abrasion between parts and causes parts tired, and the height of its quality will directly determine the service life of electromotor, therefore must be monitored Lubricating Oil quality in real time.And traditional automobile engine oil quality sensor is to reflect its oil viscosity, water content and impurity etc. by measuring the dielectric constant of machine oil or electrical conductivity, finally assess its quality level.But the measurement to oil dielectric permittivity with electrical conductivity needs to build capacitance type sensor, affected bigger by other external electromagnetic environment conditions during monitoring, it is easily caused measurement result inaccurate, and, oil medium also cannot comprehensively be analyzed by the height only using the parameter that dielectric constant is the most single with electrical conductivity to assess oil quality.
Utility model content
For above-mentioned technical problem, the purpose of this utility model is to provide a kind of Quartz tuning fork sensor, it is possible to measures the viscosity of liquid including lubricating oil, density dielectric constant directly and accurately, and then realizes the real-time monitoring to media qualities to be measured.
For reaching this purpose, this utility model by the following technical solutions:
A kind of Quartz tuning fork sensor, including: quartz tuning-fork, exciting unit, measuring unit, signal conversion unit, micro-control unit and power supply；
Described quartz tuning-fork electrically connects with exciting unit, detects sensing element as medium；
Described exciting unit is electrically connected with the microcontrol unit, and is used for driving quartz tuning-fork to vibrate；
Described measuring unit electrically connects with quartz tuning-fork, for obtaining the frequency of oscillation of quartz tuning-fork and the impedance of correspondence, and sends it to signal conversion unit；
Described signal conversion unit electrically connects with measuring unit, and being used for the impedance transformation of quartz tuning-fork frequency of oscillation and correspondence is to receive, with micro-control unit, the form that signal matches, and sends it to micro-control unit；
Described micro-control unit is used for controlling exciting unit and drives quartz tuning-fork vibration, simultaneously according to the quartz tuning-fork frequency of oscillation received and the density of impedance computation testing medium of correspondence, viscosity value；
Described power supply electrically connects with micro-control unit, exciting unit, measuring unit and signal conversion unit, for powering to micro-control unit, exciting unit, measuring unit and signal conversion unit.
Especially, described Quartz tuning fork sensor also includes that communication module, described communication module are electrically connected with the microcontrol unit, and calculates the density of testing medium of acquisition, viscosity value for exporting micro-control unit.
Especially, described Quartz tuning fork sensor also includes that host computer, described host computer electrically connect with communication module, for showing the density of testing medium, the viscosity value that communication module exports.
Especially, described exciting unit includes frequency generating units, filter unit and amplifying unit；
Especially, described frequency generating units is electrically connected with the microcontrol unit, and specifically includes AD9850 chip and difference channel, produces corresponding pumping signal for the output signal according to micro-control unit；
Especially, described filter unit electrically connects with amplifying unit, uses quadravalence low-pass Bessel filter, for the impurity of the pumping signal of rejection frequency generation unit output, and filtered signal is exported amplifying unit；
Especially, described amplifying unit electrically connects with quartz tuning-fork, uses in-phase proportion amplifying circuit, and for being amplified by filtered oscillator signal, and the signal after amplifying exports quartz tuning-fork, and excitation quartz tuning-fork produces vibration.
The Quartz tuning fork sensor that the utility model proposes, quartz tuning-fork is driven to produce stable vibration by micro-control unit controls exciting unit, measuring unit obtains frequency of oscillation and the impedance of correspondence, and send it to export after signal conversion unit is changed micro-control unit, micro-control unit calculates the density of testing medium, viscosity value, thus the quality of testing medium is judged, it is achieved that the real-time monitoring to media qualities to be measured.Meanwhile, this Quartz tuning fork sensor has monitoring accurately, highly sensitive feature.
Accompanying drawing explanation
Fig. 1 is the Quartz tuning fork sensor circuit structure block diagram that this utility model embodiment provides.
Detailed description of the invention
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.It is understood that specific embodiment described herein is used only for explaining this utility model, rather than to restriction of the present utility model.It also should be noted that, for the ease of describing, accompanying drawing illustrate only the part relevant to this utility model rather than full content, unless otherwise defined, all of technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model are generally understood that.It is intended merely to describe the purpose of specific embodiment at term used in the description of the present utility model herein, it is not intended that in limiting this utility model.Term as used herein " and/or " include the arbitrary and all of combination of one or more relevant Listed Items.
Embodiment one
Refer to shown in Fig. 1, the Quartz tuning fork sensor circuit structure block diagram that Fig. 1 provides for this utility model embodiment.
In the present embodiment, Quartz tuning fork sensor specifically includes: quartz tuning-fork 101, exciting unit 102, measuring unit 103, signal conversion unit 104, micro-control unit 105, communication unit 107, host computer 108 and power supply 106.
Described quartz tuning-fork 101 electrically connects with exciting unit 102, and natural frequency is 32.768kHZ, has the feature of high stability, high accuracy and low-power consumption, is put in testing medium, detects sensing element as medium.
Described exciting unit 102 electrically connects with micro-control unit 105, specifically includes: frequency generating units 1023, filter unit 1022 and amplifying unit 1021.
Described frequency generating units 1023 electrically connects with micro-control unit 105, specifically includes AD9850 chip, I/V change-over circuit and difference channel, and wherein, AD9850 chip produces, according to the output signal of micro-control unit 105, the single polarity current signal that two-way polarity is complementary；By I/V change-over circuit current signal being converted to voltage signal, then two-way complementary monopole voltage signal is converted to by difference channel the voltage signal of double-polarity control, the pumping signal as quartz tuning-fork 101 exports filter unit 1022.
Described filter unit 1022 electrically connects with amplifying unit 1021, uses quadravalence low-pass Bessel filter.The excitation signal waveforms of frequency generating units 1023 output is that sampling is formed by stacking, containing substantial amounts of high frequency spurs aliasing signal, after quadravalence low-pass Bessel filter filters impurity, it is thus achieved that smooth sine wave.
Described amplifying unit 1021 electrically connects with quartz tuning-fork 101, uses in-phase proportion amplifying circuit.The current signal of AD9850 chip output is 0-10.24mA, voltage up to 0-2.048V after I/V change-over circuit is changed, again by after quadravalence low-pass Bessel filter, the sinusoidal signal peak value of output is typically slightly below 2.048V, and quartz tuning-fork 101 produces the sinusoidal signal that driving source voltage is 5V required for vibration, therefore active voltage is amplified to 5V through in-phase proportion amplifying circuit by the sine wave exciting signal exported by filter unit 1022, and the signal after amplifying exports quartz tuning-fork 101, excitation quartz tuning-fork 101 produces stable vibration.
Described measuring unit 103 electrically connects with quartz tuning-fork 101, the autobalance method simplified is used to measure impedance, obtain the quartz tuning-fork 101 frequency impedance characteristic under testing medium, thus obtain the frequency of oscillation of quartz tuning-fork 101 and the impedance of correspondence, and send it to signal conversion unit 104.
Described signal conversion unit 104 electrically connects with measuring unit 103, including AD637 root-mean-square chip.The pumping signal of exciting unit 102 output is frequency signal, after quartz tuning-fork 101 and measuring unit 103, output signal is also sinusoidal frequency signal, with the format mismatching that micro-control unit 105A/D module receives signal, therefore the impedance of quartz tuning-fork 101 frequency of oscillation measuring unit 103 exported and correspondence is changed through AD637 root-mean-square chip, be converted to receive, with micro-control unit 105A/D module, the signal that the form of signal matches, be sent to micro-control unit 105.
Density is a physical quantity of quantitative description testing medium self-characteristic, and the measurement to density can be with the change of direct reaction test substance characteristic.In the present embodiment, quartz tuning-fork 101 is placed in testing medium, and testing medium density is different, then its adhering on surface medium effective mass is different, thus causes the frequency of oscillation difference of quartz tuning-fork 101.Therefore the frequency of oscillation of quartz tuning-fork 101 can reflect the change of testing medium density.Described micro-control unit 105 obtains the density values of testing medium according to quartz tuning-fork 101 frequency of oscillation received through internal calculation.
Viscosity is the amount characterizing stringy coefficient of internal friction, is that the character increased with the increase of rate of deformation is resisted in deformation by testing medium, is to weigh the important indicator that testing medium quality is high.In the present embodiment, quartz tuning-fork 101 is placed in testing medium, and its impedance operator is affected by testing medium viscosity can occur certain change, therefore the impedance of quartz tuning-fork 101 can reflect the change of testing medium viscosity.Described micro-control unit 105 obtains the viscosity value of testing medium according to quartz tuning-fork 101 frequency of oscillation received through internal calculation.
Described communication unit 107 electrically connects with micro-control unit 105, uses CAN controller, micro-control unit 105 calculates the testing medium density of acquisition, viscosity value exports host computer 108, it is achieved the communication between micro-control unit 105 and host computer 108.
Described host computer 108 electrically connects with communication unit 107, uses PC, the density of testing medium of display communication module output, viscosity value.
Described power supply 106 electrically connects with micro-control unit 105, exciting unit 102, measuring unit 103 and signal conversion unit 104, specifically include ambipolar linear stabilized power supply 106 chip LM7805 and LM7905 chip, outside ± 12V is powered be converted into ± 5V powers to micro-control unit 105, exciting unit 102, measuring unit 103 and signal conversion unit 104.
The technical solution of the utility model drives quartz tuning-fork to produce stable oscillation stationary vibration by micro-control unit controls exciting unit, measuring unit obtains frequency of oscillation and the impedance of correspondence, and send it to export after signal conversion unit is changed micro-control unit, micro-control unit calculates the density of testing medium, viscosity value, thus the quality of testing medium is judged, it is achieved that the real-time monitoring to media qualities to be measured.Meanwhile, described Quartz tuning fork sensor has monitoring accurately, highly sensitive feature.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.It will be appreciated by those skilled in the art that this utility model is not limited to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute without departing from protection domain of the present utility model.Therefore, although this utility model being described in further detail by above example, but this utility model is not limited only to above example, in the case of conceiving without departing from this utility model, other Equivalent embodiments more can also be included, and scope of the present utility model is determined by scope of the appended claims.
Claims (4)
1. a Quartz tuning fork sensor, it is characterised in that including: quartz tuning-fork, exciting unit, measuring unit, signal conversion unit, micro-control unit and power supply；
Described quartz tuning-fork electrically connects with exciting unit, detects sensing element as medium；
Described exciting unit is electrically connected with the microcontrol unit, and is used for driving quartz tuning-fork to vibrate；
Described measuring unit electrically connects with quartz tuning-fork, for obtaining the frequency of oscillation of quartz tuning-fork and the impedance of correspondence, and sends it to signal conversion unit；
Described signal conversion unit electrically connects with measuring unit, and being used for the impedance transformation of quartz tuning-fork frequency of oscillation and correspondence is to receive, with micro-control unit, the form that signal matches, and sends it to micro-control unit；
Described micro-control unit is used for controlling exciting unit and drives quartz tuning-fork vibration, simultaneously according to the quartz tuning-fork frequency of oscillation received and the density of impedance computation testing medium of correspondence, viscosity value；
Described power supply electrically connects with micro-control unit, exciting unit, measuring unit and signal conversion unit, for powering to micro-control unit, exciting unit, measuring unit and signal conversion unit.
Quartz tuning fork sensor the most according to claim 1, it is characterised in that also include that communication module, described communication module are electrically connected with the microcontrol unit, calculates the density of testing medium of acquisition, viscosity value for exporting micro-control unit.
Quartz tuning fork sensor the most according to claim 2, it is characterised in that also include that host computer, described host computer electrically connect with communication module, for showing the density of testing medium, the viscosity value that communication module exports.
Quartz tuning fork sensor the most according to claim 1, it is characterised in that described exciting unit includes frequency generating units, filter unit and amplifying unit；
Described frequency generating units is electrically connected with the microcontrol unit, and specifically includes AD9850 chip and difference channel, produces corresponding pumping signal for the output signal according to micro-control unit；
Described filter unit electrically connects with amplifying unit, uses quadravalence low-pass Bessel filter, for the impurity of the pumping signal of rejection frequency generation unit output, and filtered signal is exported amplifying unit；
Described amplifying unit electrically connects with quartz tuning-fork, uses in-phase proportion amplifying circuit, and for being amplified by filtered oscillator signal, and the signal after amplifying exports quartz tuning-fork, and excitation quartz tuning-fork produces vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521116435.9U CN205449731U (en) | 2015-12-30 | 2015-12-30 | Quartzy tuning fork sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521116435.9U CN205449731U (en) | 2015-12-30 | 2015-12-30 | Quartzy tuning fork sensor |
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| CN205449731U true CN205449731U (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521116435.9U Expired - Fee Related CN205449731U (en) | 2015-12-30 | 2015-12-30 | Quartzy tuning fork sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295576A (en) * | 2021-07-07 | 2021-08-24 | 中南大学 | Transformer oil parameter detection method, device and terminal based on quartz tuning fork |
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2015
- 2015-12-30 CN CN201521116435.9U patent/CN205449731U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295576A (en) * | 2021-07-07 | 2021-08-24 | 中南大学 | Transformer oil parameter detection method, device and terminal based on quartz tuning fork |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160810 Termination date: 20181230 |
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| CF01 | Termination of patent right due to non-payment of annual fee |