CN205301114U - Little balance drive arrangement of quartz crystal - Google Patents
Little balance drive arrangement of quartz crystal Download PDFInfo
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- CN205301114U CN205301114U CN201521116445.2U CN201521116445U CN205301114U CN 205301114 U CN205301114 U CN 205301114U CN 201521116445 U CN201521116445 U CN 201521116445U CN 205301114 U CN205301114 U CN 205301114U
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- operational amplifier
- quartz crystal
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Abstract
The utility model discloses a little balance drive arrangement of quartz crystal, include: an operational amplifier, the 2nd operational amplifier, the 3rd operational amplifier, fourth operational amplifier, wave filter, automatic gain control unit, crystal oscillator, frequency acquisition unit and little the control unit. Will little balance drive arrangement of quartz crystal is applied to the little balance of quartz crystal, quartz crystal produces stable vibration and exports oscillating voltage through the drive of vibration drive unit, the frequency acquisition unit makes the oscillating voltage wave form accord with little the control unit and reads the requirement, and export little the control unit with it, little the control unit reads it, obtain quartz crystal "Frequency", thereby the adsorbate quality with quartz crystal electrode surface, the information transfer of liquid consistency is frequency signal output, little balance measuring accuracy nature of quartz crystal and sensitivity effectively improves, the present invention has the advantages of simple structure, it is strong to take bearing force, the characteristics that can adapt to gaseous phase and liquid phase environment well.
Description
Technical field
This utility model relates to sensor detecting field, particularly relates to a kind of QCM driving device.
Background technology
Quartz crystal has higher frequency, and when the slight material mass of its surface attachment, it becomes possible to cause the change of frequency. Therefore, it can detect atomic little mass change, be widely used in the various fields such as the surface adsorption of the macromolecular materials such as the interaction of biomolecule, protein, Pathogen detection, electrochemistry and Air hygienic quality detection. QCM (Quartzcrystalmicrobalance, QCM) it is the piezoelectric effect utilizing quartz crystal, by being adsorbed on the adsorbate quality on quarts crystal electrode surface, liquid viscosity change is converted into the precision detecting instrument of measurable frequency signal, and concrete conversion process is realized by QCM driving device. But current driving device exists the problem of oscillatory instability, even failure of oscillation, thus causing that QCM measurement error is relatively big, certainty of measurement is low.
Utility model content
For above-mentioned technical problem, the purpose of this utility model is in that to provide a kind of QCM driving device, this device is applied to QCM, quartz crystal can be driven to produce stable vibration, and export the oscillating voltage of amplitude stability to micro-control unit, thus the adsorbate quality on quarts crystal electrode surface, liquid viscosity information are converted to frequency signal output, it is ensured that the accuracy of QCM measurement and sensitivity.
For reaching this purpose, this utility model by the following technical solutions:
A kind of QCM driving device, including: vibration driver element, frequency collection unit and micro-control unit;
The described external quartz crystal of vibration driver element, for making quartz crystal produce stable vibration, and export oscillating voltage, specifically include the first operational amplifier, second operational amplifier, 3rd operational amplifier, four-operational amplifier, wave filter, automatic gain control unit and crystal oscillator, described first operational amplifier, the all external quartz crystal of second opamp input terminal, outfan is successively through the 3rd operational amplifier, four-operational amplifier, wave filter, automatic gain control unit and crystal oscillator feed back to the first operational amplifier and the second operational amplifier,
Described frequency collection unit electrically connects with vibration driver element, for making the oscillating voltage waveform that vibration driver element exports meet micro-control unit reading requirement, and is output to micro-control unit;
Described micro-control unit electrically connects with frequency collection unit, for the oscillating voltage of reading frequency collecting unit output, it is thus achieved that quartz crystal frequency of oscillation.
Especially, described display unit is electrically connected with the microcontrol unit, for showing the quartz crystal frequency of oscillation that micro-control unit obtains.
Especially, described temperature control unit is electrically connected with the microcontrol unit, for controlling the operating temperature of QCM.
A kind of QCM driving device that the utility model proposes, vibration drive unit drives quartz crystal produces stable vibration and exports oscillating voltage, frequency collection unit makes oscillating voltage waveform meet micro-control unit reading requirement, and it is output to micro-control unit, it is read out by micro-control unit, obtain quartz crystal frequency of oscillation, thus the adsorbate quality on quarts crystal electrode surface, liquid viscosity information are converted to frequency signal output. This driving device can be effectively improved accuracy and the sensitivity that QCM is measured, and there is simple in construction, carrying load ability is strong, can be well adapted for the feature of gas phase and liquid phase environment.
Accompanying drawing explanation
Fig. 1 is the QCM driving device structure block diagram that this utility model embodiment provides.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail. It is understood that specific embodiment described herein is used only for explaining this utility model, but not 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 but not 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. The purpose describing specific embodiment it is intended merely to herein, it is not intended that in restriction this utility model at term used in the description of the present 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 QCM driving device structure block diagram that Fig. 1 provides for this utility model embodiment.
In the present embodiment, QCM driving device includes vibration driver element 10, frequency collection unit 108, micro-control unit 109, display unit 110 and temperature control unit 111. Wherein, described driver element 10 specifically includes: first operational amplifier the 101, second operational amplifier the 102, the 3rd operational amplifier 103, four-operational amplifier 104, wave filter 105, automatic gain control unit 106 and crystal oscillator 107.
Described first operational amplifier 101 and the second operational amplifier 102 all adopt OPA2890 chip, all external quartz crystal of its input, and outfan connects the 3rd operational amplifier 103 input. OPA2890 is a stable unity-gain voltage feedback amplifier, it is provided that only visible voltage conversion ratio and full power bandwidth in electronic feedback amplifier, is desirable RGB current drive and analogue-to-digital converters output driving. Its bandwidth range is significantly larger than the operating frequency range of quartz crystal, therefore affects only small on the phase shift of circuit, it is possible to ignore. Meanwhile, it has been internally integrated two amplifying devices, so having good common mode rejection ratio, it is possible to efficiently reduce noise, improves work efficiency and the stability of circuit.Described first operational amplifier 101 and the second operational amplifier 102 drive quartz crystal to work, and produce stable vibration, the partial noise simultaneously produced in oscillation-damped process.
Described 3rd operational amplifier 103 and four-operational amplifier 104 all adopt AD8008 chip, AD8008 is a dual pathways, high-performance, current feedback operational amplifier, there is the characteristic of ultra-low-distortion and low noise, AD8008 chip operation is in differential amplification pattern, the oscillator signal of described first operational amplifier 101 and the output of the second operational amplifier 102 does subtraction through the 3rd operational amplifier 103 and four-operational amplifier 104 respectively, the signal that quartz crystal produces is amplified, produce the phase shift of 180 degree simultaneously, thus ensureing that the operating frequency of oscillating circuit is by quartz crystal control.
Described wave filter 105 adopts Butterworth mode filter, and its frequency curve amplitude of variation in passband is little, and the filtered device 105 of oscillator signal of described four-operational amplifier 104 output has filtered the clutter beyond bandwidth range, it is thus achieved that the waveform of quartz crystal.
Described automatic gain control unit 106 adopts AD603 chip, AD603 is a voltage-controlled amplifier with 90Mhz bandwidth adjustable gain, change according to input signal regulates the size of feedback signal, and then realize the purpose automatically controlled, realize control circuit stably to export, and do not change the frequency of whole system. The oscillator signal of described wave filter 105 output carries out gain-adjusted automatically through automatic gain control unit 106, thus meeting the phase condition of quartz crystal stable oscillation stationary vibration, produces stable oscillator signal.
The oscillator signal that automatic gain control unit 106 exports is fed back to the first amplifying circuit 101 and the second amplifying circuit 102 by described crystal oscillator 107, thus forming closed loop control.
Described frequency collection unit 108 adopts LTC6244 chip, and LTC6244 is the cmos operational amplifier of a dual pathways, low noise, unity gain stable, has the gain wide-band of 50Mhz, low input capacitance and the rail-to-rail output amplitude of oscillation. The oscillator signal of described automatic gain control unit 106 output is after frequency collection unit 108, and its waveform meets micro-control unit 109 reading requirement, and micro-control unit 109 is arrived in output.
Described micro-control unit 109 adopts STC12C5A60S2 chip, STC12C5A60S2 is a kind of novel single-chip microcomputer, there is the feature of single clock/machine cycle, instruction system and 51 series monolithics are compatible, there is the data storage capacities of 60KB, operating frequency can reach 30Mhz, is 30 times of traditional 51 single-chip microcomputer efficiency. Described micro-control unit 109 receives the oscillator signal of frequency collection unit 108 output, the oscillating voltage of reading frequency collecting unit 108 output, obtains quartz crystal frequency of oscillation by internal calculation.
Described display unit 110 adopts LCD display, the frequency of oscillation that display micro-control unit 109 obtains.
The operating temperature of QCM is controlled by described temperature control unit 111, reaches the purpose of constant temperature, it is ensured that the stability of signals collecting.
The technical solution of the utility model, by vibrating, drive unit drives quartz crystal produces stable vibration and exports oscillating voltage, frequency collection unit makes oscillating voltage waveform meet micro-control unit reading requirement, and it is output to micro-control unit, it is read out by micro-control unit, obtain quartz crystal frequency of oscillation, thus the adsorbate quality on quarts crystal electrode surface, liquid viscosity information are converted to frequency signal output.This driving device can be effectively improved accuracy and the sensitivity that QCM is measured, and there is simple in construction, carrying load ability is strong, can be well adapted for the feature of gas phase and liquid phase environment.
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, when 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 appended right.
Claims (3)
1. a QCM driving device, it is characterised in that including: vibration driver element, frequency collection unit and micro-control unit;
The described external quartz crystal of vibration driver element, for making quartz crystal produce stable vibration, and export oscillating voltage, specifically include the first operational amplifier, second operational amplifier, 3rd operational amplifier, four-operational amplifier, wave filter, automatic gain control unit and crystal oscillator, described first operational amplifier, the all external quartz crystal of second opamp input terminal, outfan is successively through the 3rd operational amplifier, four-operational amplifier, wave filter, automatic gain control unit and crystal oscillator feed back to the first operational amplifier and the second operational amplifier,
Described frequency collection unit electrically connects with vibration driver element, for making the oscillating voltage waveform that vibration driver element exports meet micro-control unit reading requirement, and is output to micro-control unit;
Described micro-control unit electrically connects with frequency collection unit, for the oscillating voltage of reading frequency collecting unit output, it is thus achieved that quartz crystal frequency of oscillation.
2. QCM driving device according to claim 1, it is characterised in that also including display unit, described display unit is electrically connected with the microcontrol unit, for showing the quartz crystal frequency of oscillation that micro-control unit obtains.
3. QCM driving device according to claim 1, it is characterised in that also including temperature control unit, described temperature control unit is electrically connected with the microcontrol unit, for controlling the operating temperature of QCM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521116445.2U CN205301114U (en) | 2015-12-30 | 2015-12-30 | Little balance drive arrangement of quartz crystal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521116445.2U CN205301114U (en) | 2015-12-30 | 2015-12-30 | Little balance drive arrangement of quartz crystal |
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| Publication Number | Publication Date |
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| CN205301114U true CN205301114U (en) | 2016-06-08 |
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| CN201521116445.2U Expired - Fee Related CN205301114U (en) | 2015-12-30 | 2015-12-30 | Little balance drive arrangement of quartz crystal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272866A (en) * | 2020-02-28 | 2020-06-12 | 江苏大学 | Method for improving sensitivity of quartz crystal microbalance and application |
| CN112472099A (en) * | 2020-12-15 | 2021-03-12 | 上海应用技术大学 | Skin surface oil content detection device and method |
-
2015
- 2015-12-30 CN CN201521116445.2U patent/CN205301114U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272866A (en) * | 2020-02-28 | 2020-06-12 | 江苏大学 | Method for improving sensitivity of quartz crystal microbalance and application |
| CN112472099A (en) * | 2020-12-15 | 2021-03-12 | 上海应用技术大学 | Skin surface oil content detection device and method |
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Legal Events
| Date | Code | Title | Description |
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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: 20160608 Termination date: 20181230 |
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| CF01 | Termination of patent right due to non-payment of annual fee |