CN107748021A - A kind of temperature sensor dynamic testing method based on FPGA - Google Patents
A kind of temperature sensor dynamic testing method based on FPGA Download PDFInfo
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- CN107748021A CN107748021A CN201710918000.3A CN201710918000A CN107748021A CN 107748021 A CN107748021 A CN 107748021A CN 201710918000 A CN201710918000 A CN 201710918000A CN 107748021 A CN107748021 A CN 107748021A
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- temperature
- temperature sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The present invention relates to a kind of temperature sensor dynamic testing method based on FPGA.The present invention gathers different temperature sensor signals simultaneously using FPGA controller, realizes the synchronism detection of different types of Dynamic Characteristics of Temperature Transducers.Acquisition channel using FPGA controller according to module, a variety of different types of temperature sensors can be once gathered, and the synchronism detection of multiple dissimilar sensor dynamic characteristics according to the featured configuration different sampling stages of different temperatures sensor, can be realized.Computer is communicated by interface with FPGA controller, and the dynamic characteristic of sensor is automatically analyzed using corresponding recognizer.Because the present invention utilizes the FPGA of controller Compilation Method, the real-time and accuracy of data are improved（μ s levels）, and the advantages of make use of FPGA parallel operation, multiple signals can be with synchronous acquisition.Compared with traditional sensor dynamic testing method, it greatly improves operating efficiency, and caused error is also greatly improved during obtaining data.
Description
Technical field
The present invention relates to the dynamic parametric test field of temperature sensor, and in particular to a kind of TEMP based on FPGA
Device dynamic testing method.
Background technology
Temperature sensor is in the industrial production and daily life of the mankind, more and more common, institute's role of application
Also it is more and more indispensable, such as the monitoring of the temperature in industrial converter, this just needs to use temperature sensor have detected.
If the temperature of steel stove exactly, can not be quickly detected, huge loss of economic benefit may be produced, seriously may danger
And the life of worker.But because many sensors are due to the presence of its thermal capacity and thermal resistance, when the environment temperature hair residing for it
During raw mutation, the output of sensor can't produce the change of step evolution, but the approx change of occurrence index formula, here it is
The dynamic characteristic of temperature sensor.The dynamic characteristic of amendment temperature sensor mainly has this following several method now：Nerve net
Network revised law, simulate revised law, digital revised law.But it is intended to use above method, then must knows its sensor first
Time constant.But there is the deficiency of real-time, accuracy are poor for the method for the dynamic characteristic of present test temperature sensor
The shortcomings that, and the sensor detected every time can only be 1, or the of a sort sensor of more than one piece, such efficiency just become pole
It is low.
The content of the invention
For in place of above-mentioned the shortcomings of the prior art, the present invention provides a kind of temperature sensor dynamic based on FPGA
Method of testing.The invention largely improves the problem of inefficient and low real-time, can detect simultaneously multiple not of the same race
The dynamic characteristic of the temperature sensor of class, operated according to the detection program and software prompt finished writing, realize and detect multichannel temperature simultaneously
Sensor is spent, the different type that can be directed to connected temperature sensor sets sample frequency respectively, to the skill of operating personnel
Art Capability Requirement is low, and can record the temperature data of each sensor exactly, and the identification integrated by computer software is calculated
Method directly calculates the dynamic parameter of respective sensor, for correcting its dynamic error.
The purpose of the present invention is achieved through the following technical solutions：A kind of temperature sensor dynamic based on FPGA is tested
Method, the system of this method mainly include FPGA acquisition control modules, multi-channel sampling signaling module, computer, thermostatic oil bath
（Case）, oil groove（Case）Controller.Oil groove first（Case）Controller is connected with computer by RS232, and computer is ordered by sending
Make to oil groove（Case）Controller controls oil groove（Case）Temperature, to create the environment of test temperature sensor dynamic characteristic.
Further, the acquisition control module used uses labview FPGA pattern compilers, and making it have height can
By property and high real-time, reduce because of the uncertain of collection signal and caused by error.And " flowing water is used in FPGA programs
Line " method processing data, is thus reduced to minimum by the risk of module underflow.
Further, the computer is connected with controller by Ethernet, is transmitted using the mode of network flow
Order and data, computer are sent by network flow transmitting terminal and ordered, and after controller receives order, are grasped accordingly automatically
Make, the temperature data collected is then sent to by network flow transmitting terminal by computer, computer passes through network flow receiving terminal
Receive.
Further, using recognizer integrated on computers according to the multichannel temperature received from acquisition controller
Degrees of data, directly calculate the dynamic parameter of corresponding temperature sensor.
The beneficial effects of the present invention are：The dynamic parameter of the different types of temperature sensor of multichannel can test simultaneously,
Substantially increase operating efficiency；Based on the method for network flow in multi way temperature data transfer to computer, to the skill of operating personnel
Art Capability Requirement is low；All steps are controlled using the labview programs write on computer, reduce human error
Introducing.
Brief description of the drawings
Fig. 1 is the global overall system architecture figure of the present invention.
Fig. 2 is each module connection figure of the present invention.
Fig. 3 is the operational flow diagram of the present invention.
Fig. 4 is the temperature collect module and oil groove of the present invention（Case）Connection figure.
Fig. 5 gathers 3 road temperature datas for the present invention in the experiment of a step response.1 is the step response of thermocouple,
2 be thermistor, and 3 be RTD.
In figure, acquisition control module 1, multi pass acquisition signaling module 2, computer 3, thermostatic oil bath（Case）4th, oil groove（Case）Control
Molding block 5.
Embodiment
The present invention is described in more details below in conjunction with the accompanying drawings.
Fig. 1 illustrates overall system architecture of the present invention, a kind of temperature sensor dynamic testing method based on FPGA, including:
FPGA acquisition control modules 1, Multichannel data acquisition module 2, computer 3, thermostatic oil bath（Case）4th, oil groove（Case）Control module 5；
Thermostatic oil bath（Case）It can be used according to the existing situation of user, for example accurately may be used relatively using CJTH-300A, creation
The environment of temperature, the dynamic characteristic for test temperature sensor；
Described multi way temperature sensor can be decided in its sole discretion according to the needs of user test, and connected mode is that one end is connected to
On Multichannel data acquisition module 2, the non-sensitive part of probe is then directly immersed in oil groove（Case）In；
Described computer can be a PC for being mounted with labview, using the labview programs voluntarily write i.e.
Controllable acquisition control module 1 and oil groove（Case）Controller 5；
Fig. 2 illustrates each module connection of the present invention.Computer 3 is connected by Ethernet with acquisition module controller 1, is calculated
Machine 3 sends the order such as " collection signal " to acquisition controller 1, and acquisition module 2 then performs to be acted accordingly, and to computer 3
Send real time temperature data.Computer 3 is connected also by RS232 with oil groove controller 5, is sent to the oil groove to be controlled
（Case）Temperature.Acquisition module controller 1 is connected with acquisition module 2, carries out data exchange.Oil groove（Case）Controller 5 and thermostatical oil
Groove（Case）4 are connected, and carry out temperature control；
Fig. 3 is the flow chart of the present invention.Specially 2 structures run parallel.The host computer of 2 lines is all computer, other
Be all independent of each other, i.e. oil groove（Case）Control does not influence acquisition control；
Fig. 4 is the temperature collect module and oil groove of the present invention（Case）Connection figure.No. 4 temperature sensors in figure are example, are used
Family can optionally select the type and number of sensor, such as two wires thermal resistance, four-wire system thermal resistance etc., in oil groove（Case）
Interior, multi way temperature sensor should be arranged together as best one can, to reduce oil groove（Case）Interior temperature fluctuation is brought to test result
Adverse effect；
Fig. 5 is the example using step response method, once tests the dynamic characteristic of multiple temperature sensors, shows the phase collected
The temperature signal answered.
The test process of each module mainly includes the following steps that in said system：
1. tester, according to the good order of software translating, is connected to collection mould according to the sensor of required test dynamic parameter
The corresponding port of block 2.And sensor is put into oil groove（Case）In 4；
2. opening test system, corresponding controller is connected on computers, checks whether to be successfully connected, and operates control success
Device processed；
3. open thermostatic oil bath（Case）, preheated, to create reliable and stable temperature environment afterwards；
4. starting acquisition module controller, click on " starting to gather " and start to gather oil groove（Case）Interior temperature data, but not
Preserve, wait its oil groove（Case）Interior temperature stabilization；
5. when collecting the temperature data displays temperature of computer, start the oil groove on computer（Case）Control program, with control
Liquefaction groove（Case）Temperature reaches the change required by test sensor dynamic parameter, while clicks on " storage temperature data ", then adopts
The data of collection module collection are stored in the file that computer is specified in real time, to carry out dynamic analysis；
6. work as oil groove（Case）After the completion of interior temperature control, its automatic stabilisation is in final temperature, and the data of acquisition module are still
It is old to continue to gather, when dut temperature sensor stabilization for a period of time, " stop collection " that can be clicked in program can stop
Program；
7. finally click on " the calculating dynamic parameter " in program, you can call the integrated corresponding temperature sensor of computer software
Recognizer, realize the automatic identification of different type Dynamic Characteristics of Temperature Transducers.Dynamic parameter algorithm can use step method
Or gradient method.
Use case：In Figure 5, using the dynamic characteristic of step method test temperature sensor, we acquire 3 with FPGA
The temperature signal of the obstructed temperature sensor in road, according to statement, 1 is the step response of thermocouple, and 2 be thermistor, and 3 be platinum electricity
Resistance, it will be apparent that find out that the response time of this 3 temperature sensors is variant, we can use compiled integrated software point
Their dynamic response exponent number is analysed, directly calculates their time constant, and is showed on interface.
Claims (4)
- A kind of 1. temperature sensor dynamic testing method based on FPGA, it is characterised in that：System mainly includes FPGA collection controls Molding block（1）, multiplexed signal sampling module（2）, computer（3）, thermostat（Case）（4）, thermostat（Case）Control module（5）； Acquisition module（2）With acquisition control module（1）It is connected, to realize the control of sample frequency, control module（1）By Ethernet with Computer（3）It is connected, realizes the transmission of data；By acquisition module（2）On temperature sensor be immersed in thermostatic oil bath（Case）In （4）, realize the collection of temperature, while use is by thermostat（Case）Controller（5）With computer（3）It is connected by RS232, is come real Existing oil groove（Case）The control of temperature；By to computer（3）The calculating of data is received, can once be obtained using software recognizer To the dynamic characteristic of multiple different types of temperature sensors.
- A kind of 2. temperature sensor dynamic testing method according to right 1, it is characterised in that：Controlled by computer program Temperature controller realizes thermostat（Case）Temperature reach some set point, the inhomogeneity for being connected to multi-channel data acquisition device Type temperature sensor is synchronously put into thermostatic equipment, and the feature of different temperatures sensor is synchronously calculated according to real-time recorded data Parameter, realize the automatic identification of different type Dynamic Characteristics of Temperature Transducers.
- A kind of 3. temperature sensor dynamic testing method according to right 1, it is characterised in that：Multichannel data acquisition module can To pass through the synchronous acquisition of the standard signals such as programming realization thermal resistance, thermocouple, thermistor, 4-20mA.
- 4. a kind of temperature sensor dynamic testing method according to right 1, it is characterised in that Multichannel data acquisition module can Different sample frequencys are set with the different type for the temperature sensor connected respectively, pass through computer control after being provided with System realizes that dissimilar sensor dynamic characteristic obtains synchronism detection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109186810A (en) * | 2018-08-03 | 2019-01-11 | 江苏方天电力技术有限公司 | Thermocouple/thermal resistance step transient temperature response test macro and test method |
| CN113916404A (en) * | 2021-08-24 | 2022-01-11 | 孝感华工高理电子有限公司 | Method and system for comparing response speed of multiple NTC temperature sensors |
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Application publication date: 20180302 |