CN206223291U - Vialog - Google Patents
Vialog Download PDFInfo
- Publication number
- CN206223291U CN206223291U CN201621339476.9U CN201621339476U CN206223291U CN 206223291 U CN206223291 U CN 206223291U CN 201621339476 U CN201621339476 U CN 201621339476U CN 206223291 U CN206223291 U CN 206223291U
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- vialog
- temperature
- charge amplifier
- compensation device
- temperature compensation
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Abstract
A kind of vialog, including acceleration transducer, the acceleration transducer are made up of piezoelectric sender and charge amplifier, and the piezoelectric sender is connected with the charge amplifier；Wherein described charge amplifier includes the junction field effect transistor module and bipolar junction transistor module that are connected with each other；Vialog, is provided with signal debug circuit in the vialog, and the signal debug circuit is connected with the charge amplifier；Temperature compensation device, the temperature compensation device is serially connected on the ground wire of the acceleration transducer.The temperature compensation device is thermal resistance PT100.The utility model vialog seals in temperature compensation device in sensor internal, and temperature-compensating is carried out in the case where whole measurement system is not destroyed, and vibration measurements is equally met accuracy requirement under high temperature and low temperature environment.
Description
Technical field
The utility model is related to electricity field, more particularly to sensor technology, particularly a kind of vialog.
Background technology
Vialog, can generally select four kinds of vibration measuring parameters (acceleration, speed, displacement, high frequency acceleration), have
Measurement data keeps, various functions such as automatic shutdown.It can not only measure acceleration, speed, the displacement of vibration, to whirler
Tool and reciprocating machine carry out fault diagnosis；And can be by measuring the high frequency acceleration magnitude for vibrating, to the axle of rotating machinery
Hold, gear, carry out fault diagnosis.The operating temperature range of usual vialog is -40 °~+125 °, but in many high-temperature services
(such as the outdoor equipment of the arctic, warm in upper (such as paper plant's dryer, temperature range generally reach 150 ° even 200 °) and Cryo Equipment
Degree can reach -40 °), conventional vialog temperature influence when the detection of this kind equipment is carried out, the vibration values for detecting can be big
It is big to require do not possess reference value beyond 5% accuracy rating.
Suppress influence of the environment temperature to vialog characteristic with temperature-compensating at present, mainly using temperature self-compensation
Method, Parallel Temperature Compensation, temperature compensation by thermistor, reaction type temperature-compensating.Thermistor using negative temperature coefficient enters
Row compensation, can offset the error that a part is produced due to temperature change.But because the measured value and temperature change of vialog
It is not complete linear relationship, and compensation circuit typically also is difficult to accomplish completely the same with temperature change.So in reality
Cannot accomplish to be fully compensated in temperature-compensating, still there is phenomenon of the measured value beyond precision under portion temperature.
Utility model content
The purpose of this utility model is to provide a kind of measured value for realizing vialog under high temperature and low temperature condition to expire
The vialog of sufficient required precision.
In order to solve the above technical problems, the utility model vialog, including acceleration transducer, the acceleration transducer
It is made up of piezoelectric sender and charge amplifier, the piezoelectric sender is connected with the charge amplifier；Wherein described electric charge
Amplifier includes the junction field effect transistor module and bipolar junction transistor module that are connected with each other；Vialog, in the survey
Signal debug circuit is provided with Vibration Meter, the signal debug circuit is connected with the charge amplifier；Temperature compensation device, it is described
Temperature compensation device is serially connected on the ground wire of the acceleration transducer.
The temperature compensation device is thermal resistance PT100.
The utility model vialog seals in temperature compensation device in sensor internal, is not destroying the feelings of whole measurement system
Temperature-compensating is carried out under condition, vibration measurements is equally met accuracy requirement under high temperature and low temperature environment.
Brief description of the drawings
Fig. 1 is the utility model vialog schematic diagram；
Fig. 2 is the utility model vialog workflow diagram.
Specific embodiment
The utility model vialog is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1 and Figure 2, the utility model vialog, comprising two parts of IEPE acceleration transducers and vialog.
IEPE acceleration transducers are that a kind of piezoelectric acceleration being encapsulated in charge amplifier inside sensor housing is passed
Sensor.It is made up of piezoelectric sender and charge amplifier two parts, and piezoelectric sender is directly connected with charge amplifier, can be with
Signal to noise ratio is improved, by exporting voltage signal in low impedance after charge amplifier, anti-electromagnetic interference capability is strong, more suitable for severe ring
Signal measurement under border.
Mechanical oscillation signal is changed into charge signal by the piezoelectric sender of Sensor section, and charge signal is input to junction type
Field-effect transistor (JEFT) module.
JEFT modules are amplified to charge signal and are changed into voltage signal.Because JEFT output impedances are than larger, it is
Rear stage circuit is obtained bigger useful signal, and need to carry out the transmission of certain distance, need to connect double after JEFT modules
Pole junction transistor (BJT) amplifying circuit.
IEPE acceleration transducers need the constant current source power supply could to work, and this is a kind of two-wire system powering mode, supply lines
United two into one with output signal line, sensor produces a bias voltage as the load of constant-current source, and vibration signal is around inclined
Put voltage to fluctuate up and down, can so be modulated signals into supply line while power supply.The driving voltage allusion quotation of constant-current source
Offset is 24V, and adjustable extent is+12V~+28V, and supply current representative value is 4mA, and adjustable extent is 2mA~6mA.Vialog
24V/4mA constant current outputs are provided, after sensor accesses constant-current source, bias voltage is 5V~12V, each sensor bias voltage
There is difference, but the value is relatively fixed on same sensor, and vary with temperature smaller.
When IEPE accelerometers change in big temperature range, because of piezoelectric sender, charge amplifier and capacitance resistance etc.
Influenceed by temperature change, the vibration voltage signal (AC compounent) of parameter can be varied with temperature and changed.
The present invention seals in temperature device PT100 in IEPE acceleration transducer internal ground wires, when the temperature is changed PT100
Resistance changes with temperature, so that bias voltage (DC component) is also varied with temperature and changed.
Vialog is corresponding to+200 ° of temperature values of high temperature firstly the need of temperature correction work, -40 ° of collection correspondence low temperature is carried out
DC voltage value, as temperature compensation point, while be input into standard vibration signal at a temperature of each point, record vibration now
Magnitude of voltage (AC compounent), forms temperature compensation curve and preserves vialog internal storage space again by quadratic fit method.
Vialog gathers vibration voltage signal (AC compounent) and bias voltage (DC component) simultaneously in use,
Calculated by software, and temperature compensation curve is searched by look-up table, temperature is compensated, obtain corrected by temperature shadow
The less vibration values of sound.
Below the preferred embodiment that the utility model is created is illustrated, but the utility model is not limited to
Embodiment, those of ordinary skill in the art can also make a variety of etc. on the premise of without prejudice to the utility model creative spirit
Same modification or replacement, these equivalent modifications or replacement are all contained within scope of the present application.
Claims (2)
1. a kind of vialog, it is characterised in that including：Acceleration transducer, the acceleration transducer by piezoelectric sender and
Charge amplifier is constituted, and the piezoelectric sender is connected with the charge amplifier；Wherein described charge amplifier includes mutual
The junction field effect transistor module and bipolar junction transistor module of connection；Vialog, signal is provided with the vialog
Debug circuit, the signal debug circuit is connected with the charge amplifier；Temperature compensation device, the temperature compensation device string
It is connected on the ground wire of the acceleration transducer.
2. vialog according to claim 1, it is characterised in that the temperature compensation device is thermal resistance PT100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621339476.9U CN206223291U (en) | 2016-12-08 | 2016-12-08 | Vialog |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621339476.9U CN206223291U (en) | 2016-12-08 | 2016-12-08 | Vialog |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206223291U true CN206223291U (en) | 2017-06-06 |
Family
ID=58784828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621339476.9U Active CN206223291U (en) | 2016-12-08 | 2016-12-08 | Vialog |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206223291U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303467A (en) * | 2018-01-17 | 2018-07-20 | 刘锴 | Accelerometer, probe and the system of dynamic testing of pile method for intelligent terminal interface |
| CN114526767A (en) * | 2021-12-24 | 2022-05-24 | 杭州安脉盛智能技术有限公司 | Vibration and temperature integrated sensor based on two-wire system analog signal transmission |
-
2016
- 2016-12-08 CN CN201621339476.9U patent/CN206223291U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303467A (en) * | 2018-01-17 | 2018-07-20 | 刘锴 | Accelerometer, probe and the system of dynamic testing of pile method for intelligent terminal interface |
| CN114526767A (en) * | 2021-12-24 | 2022-05-24 | 杭州安脉盛智能技术有限公司 | Vibration and temperature integrated sensor based on two-wire system analog signal transmission |
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