CN102426052B - Vibration wire type data acquisition system and method - Google Patents
Vibration wire type data acquisition system and method Download PDFInfo
- Publication number
- CN102426052B CN102426052B CN 201110274341 CN201110274341A CN102426052B CN 102426052 B CN102426052 B CN 102426052B CN 201110274341 CN201110274341 CN 201110274341 CN 201110274341 A CN201110274341 A CN 201110274341A CN 102426052 B CN102426052 B CN 102426052B
- Authority
- CN
- China
- Prior art keywords
- circuit
- processor
- data acquisition
- signal
- fpga
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a vibration wire type data acquisition system and method. The vibration wire type data acquisition system comprises a vibration wire type sensor, a path selecting circuit, an exciting circuit, a vibration pick-up circuit, a power management circuit and a processor, as well as an FPGA (Field Programmable Gata Array) circuit, wherein the processor generates and sends a preliminary test exciting frequency control word to the FPGA circuit, the FPGA circuit controls the exciting circuit to generate a pulse signal to excite the vibration wire type sensor after shaping a sine analog signal, and the FPGA circuits samples the output frequency value of the vibration pick-up circuit and transfers the output frequency value to the processor. According to the invention, a low-voltage frequency searching exciting manner is adopted, an acquisition device can read out the frequency value of the sensor just through operating 3-5 times; therefore, the efficiency of the vibration wire type data acquisition system is improved. In addition, because the vibration wire type data acquisition system is provided with a lightning protection circuit, a built-in temperature sensing circuit, a resistance type temperature sensor and a power supply voltage alarm circuit, the vibration wire type data acquisition system is safer.
Description
Technical field
The present invention relates to a kind of sensor harvester, especially relate to a kind of vibration wire type data acquisition system and method.
Background technology
Development along with various engineering constructions such as different kinds of roads, bridge, water conservancies, the people that caused of engineering safety more and more pay close attention to and attention, and safety monitoring and early warning have very important status undoubtedly therein, the exciting mode that traditional data collector adopts is generally high pressure manipulate the strings exciting and low pressure scanning frequency excitation dual mode, but these two kinds of exciting modes of manipulating the strings have significant limitation.High pressure is manipulated the strings, and to have a sensor string wire vibration duration short for exciting mode, and signal is difficult for picking up, and measuring accuracy is poor, and easily make the sensor string wire aging and make the shortcoming of sensor failure.Although and low pressure scanning frequency excitation mode has been protected string wire, it generally all is to remove exciting by the continuous impulse that lower-frequency limit is swept to upper frequency limit, thereby exciting cycle and test period are all long.
Summary of the invention
The purpose of this invention is to provide a kind of low pressure that adopts and seek the frequently vibrating wire type data acquisition device of exciting mode, namely collector applies low pressure frequency near vibrating string type sensor to sensor, thereby makes the firm string of sensor produce vibration;
Another object of the present invention provides a kind of low pressure that adopts and seeks the frequently type vibration wire collecting method of exciting mode.
To achieve these goals, the invention provides a kind of vibration wire type data acquisition system, comprise vibrating string type sensor, channel selection circuit, excitation chain, the pick-up circuit, electric power management circuit and processor, described vibrating string type sensor sends to described channel selection circuit with oscillator signal, described channel selection circuit passes to the pick-up circuit with the oscillator signal of vibrating string type sensor, described excitation chain produces pulse signal by the string wire of channel selection circuit exciting vibrating string type sensor, described pick-up circuit amplifies Shape correction to the oscillation frequency value, described processor produces preliminary examination excited frequency control word, described processor receives and calculates output frequency value, described vibration wire type data acquisition system also comprises FPGA(Field-Programmable Gate Array, field programmable gate array) circuit, processor produces and sends preliminary examination excited frequency control word to the FPGA circuit, the FPGA circuit converts this preliminary examination excited frequency control word to its corresponding digital discrete signal, the digital discrete signal that described FPGA circuit produces is got back to described FPGA circuit by the wave filter of described excitation chain after converting sinusoidal simulating signal to through excitation chain, described FPGA circuit to this sine simulating signal shaping after the described excitation chain of control produce pulse signal; The output frequency value of described FPGA circuit sampling pick-up circuit also passes to processor.
Described vibrating wire type data acquisition device also comprises the resistor-type temperature sensor, described resistor-type temperature sensor is used for the temperature of monitoring vibrating string type sensor, described vibrating string type sensor transmits signal to the resistor-type temperature sensor, described resistor-type temperature sensor sends differential signal to channel selection circuit, can effectively monitor the alarm of vibrating string type sensor.
Described vibrating wire type data acquisition device is provided with the resistance frequency converting circuit between described channel selection circuit and FPGA circuit, described channel selection circuit sends the differential signal that the resistor-type temperature sensor sends to resistance-freq converting circuit, described resistance-freq converting circuit is sent the waveform that produces into the FPGA circuit, and described FPGA circuit produces the output frequency value of this waveform and output frequency value is sent into processor.
Described vibrating wire type data acquisition device also comprises the built-in temperature sensing circuit, also comprise the built-in temperature sensing circuit, described built-in temperature sensing circuit is used for monitoring the temperature of described vibrating wire type data acquisition device, and send Monitoring Data to processor, can effectively monitor this alarm of invention self.
Described vibrating wire type data acquisition device also comprises the supply voltage warning circuit, and when the supply voltage of equipment was lower than preset value, described supply voltage warning circuit transmission level signal can effectively be monitored the present invention's self alarm to processor.
Described vibrating wire type data acquisition device is provided with lightning protection circuit between vibrating string type sensor and channel selection circuit; described lightning protection circuit mainly is comprised of discharge tube, voltage dependent resistor (VDR) and anti-Transient Voltage Suppressor; described lightning protection circuit is not broken by thunder and lightning for the protection of described vibrating wire type data acquisition device, so that the present invention is safer.
The present invention also provides a kind of collecting method based on vibration wire type data acquisition system, described excitation chain produces the firm string of pulse signal exciting vibrating string type sensor, the oscillator signal that vibrating string type sensor produces is sent to the pick-up circuit by described channel selection circuit, processor read frequency value, further comprising the steps of:
A1, described processor produce the preliminary examination frequency control word and send to the FPGA circuit;
A2, described FPGA circuit convert the preliminary examination frequency control word to this preliminary examination frequency control word corresponding digital discrete signal;
A3, described excitation chain convert the digital discrete signal that the FPGA circuit produces to sinusoidal simulating signal;
A4, described excitation chain offset of sinusoidal simulating signal carry out sending to the FPGA circuit after filtering is processed;
A5, described FPGA circuit carry out shaping to filtered sinusoidal simulating signal, then send to excitation chain;
A6, described pick-up circuit amplify this oscillator signal, send the FPGA circuit to after the shaping;
A7, described FPGA circuit send output frequency value to processor;
A8, the frequency values of reading according to processor, processor generates corresponding frequency control word and this frequency control word is sent to the FPGA circuit;
A9, processor judge whether again the step of exciting.
In sum; owing to having adopted technique scheme; the invention has the beneficial effects as follows: use low pressure to seek frequently exciting mode; collector only need 3-5 time just can pickup frequency values; improved the efficient of vibration wire type data acquisition system; because described vibration wire type data acquisition system is provided with lightning protection circuit, built-in temperature sensing circuit, resistor-type temperature sensor and supply voltage warning circuit, so that the present invention is safer.
Description of drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the vibrating wire type data acquisition device circuit theory diagrams;
Fig. 2 is the vibrating wire type data acquisition device process flow diagram.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Shown in Fig. 1, a kind of vibration wire type data acquisition system, comprise vibrating string type sensor 1, channel selection circuit 2, excitation chain 3, pick-up circuit 4, electric power management circuit 5 and processor 6, described channel selection circuit 2 is that 8 of ADG1608 selects 1 final election device by the chip model mainly, the chip model is that 4 of ADG1609 selects 1 final election device, the G3VM-2 photoelectric relay forms, described excitation chain 3 is the digital-to-analog signal converter of AD5330 by the chip model mainly, chip AD827, the G3VM-2 photoelectric relay forms, described pick-up circuit 4 is the bandpass filter of AD827 by the chip model mainly, the chip model is that the two-stage amplifier of AD827 and comparison reshaper that the chip model is AD970 form, electric power management circuit 5 is mainly by the 25W Switching Power Supply, the chip model is the power supply changeover device of LM2596-5.0, the chip model is that the power supply changeover device of AM1117-3.3 and power supply changeover device that the chip model is ADP3338-1.5 form, and processor 6 is selected the C8051F340 single-chip microcomputer;
Described vibrating string type sensor 1 sends to described channel selection circuit 2 with oscillator signal, described channel selection circuit 2 passes to pick-up circuit 4 with the oscillator signal of vibrating string type sensor 1, described excitation chain 3 produces pulse signal by the string wire of channel selection circuit 2 exciting vibrating string type sensors 1,4 pairs of oscillation frequency values of described pick-up circuit are amplified Shape correction, described processor 6 produces preliminary examination excited frequency control word, described processor 6 receives and calculates output frequency value, described vibration wire type data acquisition system also comprises FPGA circuit 7, the EP1C3T144C8 chip that described FPGA circuit selects ALTERA company to produce, excitation chain 3, pick-up circuit 4 is connected with processor and all is connected with FPGA circuit 7, processor 6 sends preliminary examination excited frequency control word to FPGA circuit 7, FPGA circuit 7 converts this preliminary examination excited frequency control word to its corresponding digital discrete signal, after converting sinusoidal simulating signal to through excitation chain 3, the digital discrete signal that described FPGA circuit 7 produces gets back to described FPGA circuit 7 by the wave filter of described excitation chain 3,7 pairs in described FPGA circuit should be controlled described excitation chain 3 generation pulse signals after the shaping of sine simulating signal, and described excitation chain 3 produces pulse signals by the string wire of channel selection circuit 2 exciting vibrating string type sensors 1; The output frequency value of described FPGA circuit 7 sampling pick-up circuit 4 also passes to processor 6.
Described vibration wire type data acquisition system also comprises resistor-type temperature sensor 8, described resistor-type temperature sensor 8 is used for the temperature of monitoring vibrating string type sensor, described vibrating string type sensor transmits signal to resistor-type temperature sensor 8, described resistor-type temperature sensor 8 sends differential signal to channel selection circuit 2, described vibration wire type data acquisition system is provided with resistance frequency converting circuit 9 between described channel selection circuit 2 and FPGA circuit 7, described resistance frequency converting circuit 9 mainly is comprised of the NE555D timer, the differential signal that described channel selection circuit 2 sends resistor-type temperature sensor 8 sends resistance-freq converting circuit 9 to, described resistance-freq converting circuit 9 is sent the waveform that produces into FPGA circuit 7, and described FPGA circuit 7 produces the output frequency value of this waveform and output frequency value is sent into processor 6;
The differential signal that resistor-type temperature sensor 8 produces is sent to resistance-frequency converter 9 by described channel selection circuit 2, resistance-frequency converter 9 sends to FPGA circuit 7 with the waveform that produces, FPGA circuit 7 produces the output frequency value of this waveform and this output frequency value is sent to processor 6, processor 6 calculates the resistance of resistor-type temperature sensor 8, and the corresponding formula of the resistance that processor 6 provides according to resistor-type temperature sensor 8-temperature draws the temperature value of vibrating string type sensor 1.
Described vibration wire type data acquisition system also comprises built-in temperature sensing circuit 10, described built-in temperature sensing circuit 10 is selected the DS18B20 digital temperature sensor, and described built-in temperature sensing circuit 10 is monitored the temperature of described vibration wire type data acquisition system and sent Monitoring Data to processor 6.
Described vibration wire type data acquisition system also comprises supply voltage warning circuit 11, described supply voltage warning circuit 11 adopts the CE8808N27M low-voltage detection circuit, when the supply voltage of equipment was lower than 2.7V, described supply voltage warning circuit 11 transmission level signals were to processor 6.
Described vibrating wire type data acquisition device is provided with lightning protection circuit 12 between vibrating string type sensor 1 and channel selection circuit 2; described lightning protection circuit 12 mainly is comprised of gas-discharge tube, voltage dependent resistor (VDR) and anti-Transient Voltage Suppressor; described lightning protection circuit is ripe prior art; do not repeat them here, described lightning protection circuit is not broken by thunder and lightning for the protection of described vibrating wire type data acquisition device.
The STM32F107 single-chip microcomputer that described processor 6 also can select ARM company to produce.
As shown in Figure 2, a kind of collecting method based on vibration wire type data acquisition system, described processor 6 is connected with FPGA circuit 7, and processor 6 produces the preliminary examination frequency control word and sends to FPGA circuit 7.
Described FPGA circuit 7 converts the preliminary examination frequency control word to this preliminary examination frequency control word corresponding digital discrete signal, described FPGA circuit 7 sends to excitation chain 3 with digital discrete signal, the digital-to-analog signal converter of described excitation chain 3 converts digital discrete signal to sinusoidal simulating signal, described sinusoidal simulating signal carries out sending to FPGA circuit 7 after filtering is processed through chip AD827,7 pairs of filtered sinusoidal simulating signals of described FPGA circuit are carried out shaping, then send to the G3VM-2 photoelectric relay of excitation chain 3, thereby make described excitation chain 3 produce the firm string of pulse signal exciting vibrating string type sensor.
The oscillator signal that described vibrating string type sensor 1 produces is sent to the bandpass filter of pick-up circuit 4 by described channel selection circuit 2, carrying out sending into two-stage amplifier after filtering is processed amplifies, two-stage amplifier sends this signal to the AD970 comparer and carries out Shape correction, AD970 sent output frequency value to FPGA circuit 7 after shaping was finished, the output frequency value of 7 pairs of pick-up circuit 4 of described FPGA circuit is sampled, described FPGA circuit 7 sends output frequency value to processor 6, processor 6 read frequency values; Processor 6 judges whether repeatedly exciting, and when needs repeatedly when exciting, according to the frequency values of reading, processor 6 generates corresponding frequency control words and this frequency control word is sent to the FPGA circuit.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (7)
1. vibrating wire type data acquisition device, comprise vibrating string type sensor (1), channel selection circuit (2), excitation chain (3), pick-up circuit (4), electric power management circuit (5) and processor (6), described vibrating string type sensor (1) sends to described channel selection circuit (2) with oscillator signal, described channel selection circuit (2) passes to pick-up circuit (4) with the oscillator signal of vibrating string type sensor (1), described excitation chain (3) produces pulse signal by the string wire of channel selection circuit (2) exciting vibrating string type sensor (1), described pick-up circuit (4) amplifies Shape correction to oscillator signal, described processor (6) produces preliminary examination excited frequency control word, described processor (6) receives and calculates output frequency value, it is characterized in that: also comprise FPGA circuit (7), processor (6) produces and sends preliminary examination excited frequency control word to FPGA circuit (7), FPGA circuit (7) converts this preliminary examination excited frequency control word to its corresponding digital discrete signal, the digital discrete signal that described FPGA circuit (7) produces converts sinusoidal simulating signal to through the digital-to-analog signal converter of excitation chain (3), this sine simulating signal is got back to described FPGA circuit (7) by the wave filter of described excitation chain (3), described FPGA circuit (7) to this sine simulating signal shaping after the described excitation chain of control (3) produce pulse signal; The output frequency value of described FPGA circuit (7) sampling pick-up circuit (4) also passes to processor (6).
2. vibrating wire type data acquisition device according to claim 1, it is characterized in that: also comprise resistor-type temperature sensor (8), described resistor-type temperature sensor (8) is used for the temperature of monitoring vibrating string type sensor (1), described vibrating string type sensor transmits signal to resistor-type temperature sensor (8), and described resistor-type temperature sensor (8) sends differential signal to channel selection circuit (2).
3. vibrating wire type data acquisition device according to claim 2, it is characterized in that: between described channel selection circuit (2) and FPGA circuit (7), be provided with resistance frequency converting circuit (9), the differential signal that described channel selection circuit (2) sends resistor-type temperature sensor (8) sends resistance-freq converting circuit (9) to, described resistance-freq converting circuit (9) is sent the waveform that produces into FPGA circuit (7), and described FPGA circuit (7) produces the output frequency value of this waveform and output frequency value is sent into processor (6).
4. vibrating wire type data acquisition device according to claim 1, it is characterized in that: also comprise built-in temperature sensing circuit (10), described built-in temperature sensing circuit (10) is used for monitoring the temperature of described vibrating wire type data acquisition device, and sends Monitoring Data to processor (6).
5. vibrating wire type data acquisition device according to claim 1, it is characterized in that: also comprise supply voltage warning circuit (11), when the supply voltage of equipment was lower than preset value, described supply voltage warning circuit (11) transmission level signal was to processor (6).
6. vibrating wire type data acquisition device according to claim 1 is characterized in that: be provided with lightning protection circuit (12) between vibrating string type sensor (1) and channel selection circuit (2).
7. collecting method based on vibration wire type data acquisition system, excitation chain (3) produces the firm string of pulse signal exciting vibrating string type sensor, the oscillator signal that vibrating string type sensor produces is sent to pick-up circuit (4) by channel selection circuit (2), processor (6) read frequency value characterized by further comprising following steps:
A1, described processor (6) produce the preliminary examination frequency control word and send to FPGA circuit (7);
A2, described FPGA circuit (7) convert the preliminary examination frequency control word to this preliminary examination frequency control word corresponding digital discrete signal;
A3, described excitation chain (3) convert the digital discrete signal that FPGA circuit (7) produces to sinusoidal simulating signal;
A4, described excitation chain (3) offset of sinusoidal simulating signal carry out sending to FPGA circuit (7) after filtering is processed;
A5, described FPGA circuit (7) carry out shaping to filtered sinusoidal simulating signal, then send to excitation chain (3);
A6, described pick-up circuit (4) amplify this oscillator signal, send FPGA circuit (7) to after the shaping;
A7, described FPGA circuit (7) send output frequency value to processor (6);
A8, the frequency values of reading according to processor (6), processor (6) generates corresponding frequency control word and this frequency control word is sent to the FPGA circuit;
A9, processor judge whether again the step of exciting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110274341 CN102426052B (en) | 2011-09-16 | 2011-09-16 | Vibration wire type data acquisition system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110274341 CN102426052B (en) | 2011-09-16 | 2011-09-16 | Vibration wire type data acquisition system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102426052A CN102426052A (en) | 2012-04-25 |
| CN102426052B true CN102426052B (en) | 2013-01-30 |
Family
ID=45960056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110274341 Expired - Fee Related CN102426052B (en) | 2011-09-16 | 2011-09-16 | Vibration wire type data acquisition system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102426052B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154987B (en) * | 2014-07-10 | 2017-01-04 | 山东大学 | A kind of vibrating string type sensor plate reading |
| CN104764482A (en) * | 2015-04-14 | 2015-07-08 | 上海同磊土木工程技术有限公司 | Multifunctional full-automatic acquisition instrument with vibration wire sensors |
| CN105069894A (en) * | 2015-05-13 | 2015-11-18 | 恒银金融科技有限公司 | Hall-type detection device used for detecting thickness of paper money |
| CN105115590A (en) * | 2015-08-28 | 2015-12-02 | 苏州市博得立电源科技有限公司 | Environmental noise measuring instrument based on sine wave inverter power supply |
| CN105486334B (en) * | 2015-12-01 | 2017-11-10 | 常州大学 | A kind of rapid measurement device on vibrating wire sensor frequency |
| CN106679703B (en) * | 2017-02-24 | 2022-11-08 | 河北稳控科技有限公司 | Data reading device of vibrating wire type sensor and working method thereof |
| CN107462341A (en) * | 2017-07-31 | 2017-12-12 | 成都众邦凯测科技有限公司 | A kind of jamproof vibratory string acquisition system |
| CN107525540A (en) * | 2017-07-31 | 2017-12-29 | 成都众邦凯测科技有限公司 | A kind of vibratory string acquisition system of intelligent constant-temperature |
| CN108346275A (en) * | 2018-05-11 | 2018-07-31 | 东华理工大学 | A kind of vibrating string type sensor synthesis reading survey device based on 4G networks |
| CN109060005B (en) * | 2018-06-28 | 2021-03-05 | 广州大铁锐威科技有限公司 | Intelligent acquisition system for large building structure safety |
| CN109506716B (en) * | 2018-12-25 | 2021-03-19 | 岩联(武汉)科技有限公司 | Vibrating wire type acquisition terminal and excitation frequency band acquisition method thereof |
| CN113252098A (en) * | 2021-05-12 | 2021-08-13 | 福建省计量科学研究院（福建省眼镜质量检验站） | Calibration connector based on transient suppression |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202255617U (en) * | 2011-09-16 | 2012-05-30 | 重庆恩菲斯软件有限公司 | Vibrating wire type data acquisition unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571407B (en) * | 2009-06-19 | 2010-11-10 | 中国水利水电科学研究院 | Excitation method of vibrating wire sensor |
| KR101044626B1 (en) * | 2009-07-14 | 2011-06-29 | 주식회사 디에스텍 | System to measure a resonant frequency of a vibrating-wire sensor using a digital counter |
| CN201787958U (en) * | 2010-08-18 | 2011-04-06 | 无锡职业技术学院 | Multi-channel signal acquisition card of vibrating string type sensor and based on controller area network (CAN) bus |
| CN201974154U (en) * | 2010-12-03 | 2011-09-14 | 中冶建筑研究总院有限公司 | Vibrating string type strain measurement device |
| CN201909669U (en) * | 2010-12-28 | 2011-07-27 | 基康仪器(北京)有限公司 | Frequency measurement system of unicoil vibrating wire instrument |
| CN102141428A (en) * | 2010-12-28 | 2011-08-03 | 基康仪器(北京)有限公司 | Method and system for measuring frequency of single coil vibrating instrument |
-
2011
- 2011-09-16 CN CN 201110274341 patent/CN102426052B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202255617U (en) * | 2011-09-16 | 2012-05-30 | 重庆恩菲斯软件有限公司 | Vibrating wire type data acquisition unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102426052A (en) | 2012-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102426052B (en) | Vibration wire type data acquisition system and method | |
| CN202255617U (en) | Vibrating wire type data acquisition unit | |
| CN103968973A (en) | Shock excitation method for vibrating wire sensor | |
| CN103713181B (en) | Weak current signal supervisory instrument | |
| CN202586499U (en) | Intelligent arc detection device used for photovoltaic-power-station direct current side | |
| CN104422825A (en) | Method and method for detecting insulation resistance against ground of DC power supply | |
| CN103713243B (en) | 10V inside switch cabinet discharging detection device based on electromagnetic antenna receiving array | |
| CN105182203B (en) | A kind of power capacitor local discharge detection device and detection method | |
| CN103983840A (en) | Device for monitoring leakage and corona pulse current of alternating current insulator on line and online monitoring method using device | |
| CN108303625B (en) | Cable line partial discharge monitoring device, method, terminal and readable storage medium | |
| CN106842013A (en) | The live detection method and device of the contact of breaker ablation degree based on electromagnetic wave | |
| CN213457212U (en) | Partial discharge detection device for high-voltage electrical equipment | |
| CN205280857U (en) | Insulating leakage current on -line monitoring circuit of power equipment | |
| CN106773967B (en) | Vibrating wire acquisition instrument with vibrating wire sensor diagnosis function | |
| CN203929875U (en) | A kind of on-Line Monitor Device that exchanges insulator leakage and corona pulse electric current | |
| CN204302443U (en) | A kind of power equipment Partial Discharge Detection and warning device | |
| CN207198284U (en) | A kind of local discharge detection device | |
| CN107064673A (en) | Electric arc detecting device and double-fed wind power generator electric brush slip ring protection system | |
| CN104658169A (en) | Intelligent fire alarm system | |
| CN204495375U (en) | The full-automatic Acquisition Instrument of multifunctional vibration string type sensor | |
| CN210603708U (en) | Pressure sensor sampling device | |
| CN104075823B (en) | Alarm circuit | |
| CN103472345B (en) | A kind of electrical equipment grounding line burn-in test circuit | |
| CN202975217U (en) | Insulator monitoring device based on wireless transmission | |
| CN107884595A (en) | Vehicle, speed acquisition device and its self-checking unit and self checking method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20180916 |