CN2670948Y - Digital sensor for measuring vibration acceleration - Google Patents
Digital sensor for measuring vibration acceleration Download PDFInfo
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- CN2670948Y CN2670948Y CN 200320124119 CN200320124119U CN2670948Y CN 2670948 Y CN2670948 Y CN 2670948Y CN 200320124119 CN200320124119 CN 200320124119 CN 200320124119 U CN200320124119 U CN 200320124119U CN 2670948 Y CN2670948 Y CN 2670948Y
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses a digital sensor for measuring vibration acceleration, which comprises a vibration sensing element, a signal processing circuit, an analogue-digital conversion circuit and an interface. Wherein, the interface is provided with an I< 2 >C bus, adopts a 5V power source to work, and uses four-core shielding wire to transmit. The sensing element extracts vibratory shock signals which is amplified to 0-5V voltage signals through the signal processing circuit nearby, the analogue-digital conversion circuit is converted into digital signals, which is discharged through the I< 2 >C bus interface. The utility model adopts the I< 2 >C bus as an output interface to solve the problem that the anti-interference capability of the analog sensor is weaker. The digital sensor for measuring vibration acceleration has the advantages of simple structure, all built-in circuits, high integrated degree, high resolution, less power consumption and stable and reliable transmission. The electrical isolation between the sensor and the subsequent data collection system can be easily realized. Furthermore, the digital sensor for measuring vibration acceleration has strong anti-interference capability, effectively extracts the condition information of vibration, impact, etc, and digitize. The digital sensor for measuring vibration acceleration can be widely used for the measurement of vibratory shock of mechanical equipment.
Description
Technical field
The utility model relates to a kind of sensor, particularly a kind of digital sensor that is used for the measuring vibrations acceleration.
Background technology
The existing sensor majority that is used for the measuring vibrations acceleration is analog sensor, it is transformed into aanalogvoltage or current signal with external information, with analogue instrument or analog computer is object output, the major defect of such sensor is: output amplitude is little, sensitivity is low, can't satisfy modern-day digital computer or digital instrument interface.In addition, distance between sensor and the data acquisition unit is generally all far away, and the running environment of equipment under test is relatively poor, add the electromagnetic interference (EMI) that consumers such as motor, fairing produce, the power frequency of high frequency electric source line is disturbed, the impedance disturbances that the common ground impedance between measuring system and each element circuit produces, and the transmission of long line brings loss of signal on the circuit or the like, in a word, all these interference and loss all can have influence on the measuring accuracy of equipment under test.
Summary of the invention
At above-mentioned situation, the purpose of this utility model be to provide a kind of not only can be anti-interference but also transmission is reliable and the higher digital sensor that is used for the measuring vibrations acceleration of resolution.
For achieving the above object, a kind of digital sensor that is used for the measuring vibrations acceleration of the present utility model, involving vibrations sensitive element, signal conditioning circuit, analog to digital conversion circuit and interface, wherein, interface is provided with I
2C bus, and adopt single 5V power work, the transmission of four-core shielding line, by sensitive element extract vibration and shock signal, through signal conditioning circuit be enlarged into 0～5V voltage signal nearby, analog to digital conversion circuit converts digital signal to, again through I
2The output of C bus interface.
For the electrical isolation that ensures that transmission is reliable, reduce power consumption and realize sensor and follow-up data acquisition system, its further step is:
The vibration sensitive element (1) that adopts is shearing-type piezoelectric acceleration sensitive element Q1, and have with this sensitive element Q1 coupling: the signal conditioning circuit (2) that amplifier IC1:TLC277 and resistance R 1～R5, capacitor C 1～C4 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 of C bus interface and plug connector JK1 constitute.
The vibration sensitive element (1) that adopts is shearing-type piezoelectric acceleration sensitive element Q1, and have with this sensitive element Q1 coupling: the signal conditioning circuit (2) that integrated single supply instrument amplifier IC1:AD623 and resistance R 1～R3, capacitor C 1～C2 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 of C bus interface and plug connector JK1 constitute.
The vibration sensitive element (1) that adopts is IC1 built-in " H " shape differential capacitance type acceleration sensor, have with this sensitive element coupling: the signal conditioning circuit (2) that IC1:ADXL150 or its serial one chip acceleration sensor chip and resistance R 1～R3, capacitor C 1～C3 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 of C bus interface and plug connector JK1 constitute.
The vibration sensitive element (1) that adopts is the built-in differential capacitance type acceleration sensor of IC1, have with this differential capacitor coupling: the signal conditioning circuit (2) that IC1:MMA2202 or its serial one chip acceleration sensor chip and resistance R 1～R2, capacitor C 1～C3 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 of C bus interface and plug connector JK1 constitute.
The utility model is because the employing output interface is I
2The scheme of C bus has solved the more weak problem of analog sensor antijamming capability.Make it to have that simple in structure, whole circuit are built-in, integrated level is high, resolution is high, power consumption is less, cost is low, transmission is stable, reliable, realize the electrical isolation of sensor and follow-up data acquisition system easily, antijamming capability is strong, can effectively extract status information and digitizings such as vibration, impact.Can be widely used in the measurement that mechanical equipment vibration impacts.
The present invention is further detailed explanation below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is structure of the present utility model and functional-block diagram.
Fig. 2 is the circuit theory diagrams of embodiment one.
Fig. 3 is the circuit theory diagrams of embodiment two.
Fig. 4 is the circuit theory diagrams of embodiment three.
Fig. 5 is the circuit theory diagrams of embodiment four.
Embodiment
Referring to accompanying drawing, a kind of digital sensor that is used for the measuring vibrations acceleration, comprise be provided with long-distance transmissions the number of winning the confidence and with the I of the computing machine direct digital interface of measuring system
2C bus and interface, this I
2C bus and interface have the high performance serial bus of needed ruling of multi-host system and high low speed device synchronization operation function, and all circuit is built-in.Present embodiment is selected a kind of simple of PHILIPS company for use, bidirectional two-line system synchronous serial bus, only need two lines, promptly by serial time clock line SCL and serial data line SDA just can be between each device that is connected on the bus transmission information, it adopts power consumption extremely low, realize the four-core shielding line transmission of the electrical isolation of sensor and follow-up data acquisition system easily, promptly two cores connect power supply, two cores connect signal, screen layer connects shell, single 5V power supply power supply, by vibration sensitive element the vibratory impulse parameter of tested plant equipment key position is converted to electric parameter, this electric parameter is amplified and is converted to the voltage signal of 0～5V nearby by signal conditioning circuit, convert digital signal output to through analog to digital converter again.
Embodiment of the present utility model is below proposed:
One of embodiment: as shown in Figure 2, vibratory impulse is extracted by shearing-type piezoelectric acceleration sensitive element Q1, and have with this sensitive element Q1 coupling: the signal conditioning circuit (2) that amplifier IC1:TLC277 and resistance R 1～R5, capacitor C 1～C4 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that serial a/d converter IC 2 of C bus interface (as: selecting model for use is ADS7823 etc.) and plug connector JK1 constitute.The real-time of vibration and shock signal is very strong and frequency content abundant; And piezoelectric sensor is mainly used in ergometry, acceleration, shock and vibration, it can have voltage and two kinds of outputs of electric charge, its follow-up amplifying circuit correspondingly is divided into voltage amplification and electric charge amplifies two kinds, measurement sensitivity that electric charge amplifies and connection cable length are irrelevant, are fit to longer-distance measurement.IC1A among Fig. 2, C
1And R
3Form one and have the degenerative high-gain charge amplifying circuit of the degree of depth, utilize feedback capacity C
1Is the charge conversion of piezoelectric sensor input voltage output, changes feedback capacity C
1Size, can change the output sensitivity of charge amplifier, thereby can measure the vibration accelerations of different sizes.According to this charge amplifying circuit, make that sensor capacitance is C
n, electric cable capacitance is C
c, the input capacitance of amplifier is C
i, the open-loop gain of operational amplifier is A, then feedback capacity C
1The effective capacitance that is folded to amp.in is (1+A) C
1If ignore the input resistance and the leakage resistance in parallel with feedback capacity of amplifier, then amplifier output voltage is:
Because A＞＞1, so C in the following formula
n+ C
c+ C
iThe C of＜＜(1+A)
1, this moment sensor capacitance C
n, electric cable capacitance C
cInput capacitance C with amplifier
iCan ignore, the output voltage of amplifier can be expressed as:
Therefore, the output voltage of charge amplifier is relevant with the quantity of electric charge and charge amplifier feedback capacity that sensor produces, and the influence of other factorses such as electric cable capacitance can be ignored.C among Fig. 2
3, C
4Be power supply coupling capacitor, R
1, R
2, C
2Be used for providing with reference to ground level, to realize the measurement of positive and negative vibratory impulse to single supply work amplifier; Resistance R
4, R
5Form a voltage amplifier circuit with amplifier IC1B, be used for the output voltage range of charge amplifier IC1A is amplified between 0～5V, to guarantee the resolution of A/D conversion; IC2 has I
2The serial a/d converter of C bus interface, operating voltage is+5V, resolution is 12bit, sample frequency＞100KHz, optional chip has: ADS7822, ADS7823, ADS7816, ADS7817, TLC2544, TLV2554 etc., adopt this A/D converter only to need serial time clock line and two lines of serial data line to make that sensor construction is simple, reliability improves being connected in transmission information between sensor on the bus and the data acquisition system (DAS).
Two of embodiment: as shown in Figure 3, vibratory impulse is extracted by shearing-type piezoelectric acceleration sensitive element Q1, have with this sensitive element Q1 coupling: the signal conditioning circuit (2) that integrated single supply instrument amplifier IC1:AD623 and resistance R 1～R3, capacitor C 1～C2 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 (as: ADS7822 etc.) of C bus interface and plug connector JK1 constitute.As described in embodiment one, piezoelectric sensor can have voltage and two kinds of outputs of electric charge, its follow-up amplifying circuit correspondingly is divided into voltage amplification and electric charge amplifies two kinds, the utility model is owing to place sensor internal with whole circuit, being connected between piezoelectric element and the amplifying circuit is extremely short, so present embodiment adopts the voltage amplification mode, realize by the integrated single supply instrument amplifier of IC1:AD623.AD623 can single supply+3V～+ output of power supply amplitude is provided under the 12V, allow to use single gain that resistance is set and carry out gain programming, to obtain better customer flexibility, and meet the industrial standard pin configuration of 8 pins, under no outer meeting resistance condition, AD623 is set to unity gain (G=1), after inserting resistance, able to programme gain is set.In Fig. 3, its gain
(reaching as high as 1000 times), sensor capacitance is C
n, the input voltage of amplifier is
Then the output voltage of IC1:AD623 is:
Therefore, can reach the output of IC1 between 0～5V as long as regulate R1; C among Fig. 3
1, C
2Be power supply coupling capacitor, R
3, R
2Be used for providing with reference to ground level, to realize the measurement of positive and negative vibratory impulse to single supply work amplifier; IC2 has I
2The serial a/d converter of C bus interface, its operating voltage, resolution, sample frequency, optional chip etc. are identical with embodiment one.
Three of embodiment: as shown in Figure 4, vibratory impulse is extracted by built-in " H " shape differential capacitance type acceleration sensor of IC1, have with this sensitive element coupling: the signal conditioning circuit (2) that IC1:ADXL150 or its serial one chip acceleration sensor chip and resistance R 1～R3, capacitor C 1～C3 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 (as: ADS7816 etc.) of C bus interface and plug connector JK1 constitute.Among Fig. 4, IC1 is the ADXL series one chip capacitance acceleration sensor that ADI company releases, constitute closed loop trailing type accelerometer with close-loop feedback dynamic balance technology and complete signal conditioning circuit, be made up of the little processing of polysilicon surface (POLY SILICONSURFACE-MICRO-MACHINED) sensitive element and signal conditioning circuit, its inside mainly comprises: sensitive element, oscillator (output frequency is 1MHZ), reference voltage source, detuner, low-pass filter, prime amplifier, independently output amplifier and self-detection circuit; Not only volume is little for it, can be directly installed on the printed circuit board (PCB), and also highly sensitive, can measure positive and negative acceleration signal, and can be according to different requirements, the user can adjust sensitivity and measurement range voluntarily; It both can measure dynamic acceleration, can measure static acceleration again, and the voltage of its output is directly proportional with the acceleration of being experienced.The optional model of present embodiment has: ADXL05 (X axis sensitivity, measurement range: ± 5g), ADXL50 (X axis sensitivity, measurement range: ± 50g), ADXL105 (X axis sensitivity, measurement range: ± 1.5g), ADXL150 (X axis sensitivity, measurement range: ± 50g), ADXL190 (X axis sensitivity, measurement range: ± 100g), ADXL181 (the X axis sensitivity, measurement range :-150～+ serial one chip acceleration sensor chip such as 250g).C among Fig. 4
1, C
3Be power supply coupling capacitor, R
1, R
2, C
2Be used for resonance-amplifier and export zero point, R
3Be used for the self check input end is put low level (not carrying out self check); IC2 has I
2The serial a/d converter of C bus interface, its system of selection and embodiment one are similar.
Four of embodiment: as shown in Figure 5, vibratory impulse is extracted by the built-in differential capacitance type acceleration sensor of IC1, have with this differential capacitor coupling: the signal conditioning circuit (2) that IC1:MMA2202 or its serial one chip acceleration sensor chip and resistance R 1～R2, capacitor C 1～C3 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 (as: ADS7817 etc.) of C bus interface and plug connector JK1 constitute.Among Fig. 5, IC1 is the little processing monolithic of the MMA series polysilicon surface acceleration transducer that MOTOROLA company releases, its inside mainly comprises: capacitance-sensitive element, 4 rank low-pass filters, signal processing circuit and self-detection circuit etc., it is the ideal element that vibratory impulse is measured, it both can measure acceleration of gravity (static state), can measure again by parameters (dynamically) such as vibration, the acceleration that impacts generation, speed displacement, voltage of its linear output is directly proportional with the acceleration of being experienced.The optional model of present embodiment has: (Z is axially responsive for MMA1200D, measurement range: ± 250g), (Z is axially responsive for MMA1201P, measurement range: ± 40g), (Z is axially responsive for MMA1220D, measurement range: ± 8g), (Z is axially responsive for MMA1250D, measurement range: ± 5g), (Z is axially responsive for MMA1270D, measurement range: ± 2.5g), (Z is axially responsive for MMA1260D, measurement range: ± 1.5g), MMA2200W (X axis sensitivity, measurement range: ± 40g), MMA2201D (X axis sensitivity, measurement range: ± 40g), MMA2202D (X axis sensitivity, measurement range: ± serial one chip acceleration sensor chip such as 50g).C among Fig. 5
1, C
3Be power supply coupling capacitor, R
1, C
2Constitute the output low-pass filter, R
2Be used for the self check input end is put low level (not carrying out self check); IC2 has I
2The serial a/d converter of C bus interface, its system of selection and embodiment one are similar.
It is worthy of note: because the utility model adopts based on I
2Whole circuit of the measuring vibrations acceleration transducer of C bus are built-in, select the transmission of four-core shielding line for use, realize the electrical isolation of sensor and follow-up data acquisition system easily, protect internal circuit reliably, avoid external disturbance.Can effectively extract the status information such as vibration, impact of plant equipment, the status monitoring of equipment under the occasion such as complex structure, work under bad environment, undesired signal be numerous and diverse is had unique advantage.Its I
2The C bus interface can make things convenient for digital display circuit or microprocessor to connect and compose the digitizing TT﹠C system, have integrated level height, resolution height, simple in structure, antijamming capability strong, good stability, low in energy consumption, characteristics such as cost is few.Comprehensive technical indexes is: (1) interface mode: I
2C bus (the I that meets philips company
2C bus serial communication interface standard), transfer rate≤400Kbit/s; (2) measurement range: determine by sensitive element; (3) frequency range: DC～20KHz; (4) dynamic range: 12bit; (5) working power: direct current+5V.
Claims (5)
1, a kind of digital sensor that is used for the measuring vibrations acceleration, involving vibrations sensitive element, signal conditioning circuit, analog to digital conversion circuit and interface is characterized in that: described interface is provided with I
2The C bus, and adopt single supply work, the shielding line transmission is extracted vibration and shock signal, is converted to digital signal through signal conditioning circuit amplification, analog to digital conversion circuit, again through described I by sensitive element
2The output of C bus interface.
2, digital sensor according to claim 1, it is characterized in that: described vibration sensitive element (1) is shearing-type piezoelectric acceleration sensitive element Q1, have with this sensitive element Q1 coupling: the signal conditioning circuit (2) that amplifier IC1:TLC277 and resistance R 1～R5, capacitor C 1～C4 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 of C bus interface and plug connector JK1 constitute.
3, digital sensor according to claim 1, it is characterized in that: described vibration sensitive element (1) is shearing-type piezoelectric acceleration sensitive element Q1, have with this sensitive element Q1 coupling: the signal conditioning circuit (2) that integrated single supply instrument amplifier IC1:AD623 and resistance R 1～R3, capacitor C 1～C2 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 of C bus interface and plug connector JK1 constitute.
4, according to claim 1 or 3 described digital sensors, it is characterized in that: described vibration sensitive element (1) is IC1 built-in " H " shape differential capacitance type acceleration sensor, have with this sensitive element coupling: the signal conditioning circuit (2) that IC1:ADXL150 or its serial one chip acceleration sensor chip and resistance R 1～R3, capacitor C 1～C3 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 of C bus interface and plug connector JK1 constitute.
5, according to claim 1 or 3 described digital sensors, it is characterized in that: described vibration sensitive element (1) is the built-in differential capacitance type acceleration sensor of IC1, have with this differential capacitor coupling: the signal conditioning circuit (2) that IC1:MMA2202 or its serial one chip acceleration sensor chip and resistance R 1～R2, capacitor C 1～C3 constitute has described I
2Analog to digital conversion circuit (3) and interface (4) that the serial a/d converter IC 2 of C bus interface and plug connector JK1 constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320124119 CN2670948Y (en) | 2003-12-26 | 2003-12-26 | Digital sensor for measuring vibration acceleration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320124119 CN2670948Y (en) | 2003-12-26 | 2003-12-26 | Digital sensor for measuring vibration acceleration |
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| Publication Number | Publication Date |
|---|---|
| CN2670948Y true CN2670948Y (en) | 2005-01-12 |
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ID=34476589
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|---|---|---|---|
| CN 200320124119 Expired - Fee Related CN2670948Y (en) | 2003-12-26 | 2003-12-26 | Digital sensor for measuring vibration acceleration |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405416C (en) * | 2006-05-31 | 2008-07-23 | 北京领邦仪器技术有限公司 | Virtual instrument signal regulating device |
| CN100458863C (en) * | 2007-03-16 | 2009-02-04 | 廊坊智通机器人系统有限公司 | Signal processing system in measurement technology |
| CN106771353A (en) * | 2016-12-23 | 2017-05-31 | 深圳市森瑟科技有限公司 | Acceleration transducer |
| CN107923750A (en) * | 2015-08-21 | 2018-04-17 | 株式会社电装 | Compound sensor |
| CN110017891A (en) * | 2019-04-01 | 2019-07-16 | 中北大学 | A kind of digital vibrating sensor based on picogram bus transfer agreement |
| CN110514870A (en) * | 2019-08-13 | 2019-11-29 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of silicon pendulum accelerometer signal conditioning device and system |
-
2003
- 2003-12-26 CN CN 200320124119 patent/CN2670948Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405416C (en) * | 2006-05-31 | 2008-07-23 | 北京领邦仪器技术有限公司 | Virtual instrument signal regulating device |
| CN100458863C (en) * | 2007-03-16 | 2009-02-04 | 廊坊智通机器人系统有限公司 | Signal processing system in measurement technology |
| CN107923750A (en) * | 2015-08-21 | 2018-04-17 | 株式会社电装 | Compound sensor |
| CN107923750B (en) * | 2015-08-21 | 2021-05-07 | 株式会社电装 | Composite sensor |
| CN106771353A (en) * | 2016-12-23 | 2017-05-31 | 深圳市森瑟科技有限公司 | Acceleration transducer |
| CN110017891A (en) * | 2019-04-01 | 2019-07-16 | 中北大学 | A kind of digital vibrating sensor based on picogram bus transfer agreement |
| CN110514870A (en) * | 2019-08-13 | 2019-11-29 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of silicon pendulum accelerometer signal conditioning device and system |
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| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |