CN208937210U - A microstructure fast temperature sensor and miniaturized acquisition circuit - Google Patents
A microstructure fast temperature sensor and miniaturized acquisition circuit Download PDFInfo
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- CN208937210U CN208937210U CN201721184421.XU CN201721184421U CN208937210U CN 208937210 U CN208937210 U CN 208937210U CN 201721184421 U CN201721184421 U CN 201721184421U CN 208937210 U CN208937210 U CN 208937210U
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Abstract
本实用新型公开了一种微结构快速温度传感器及其小型化采集电路，所述微结构快速温度传感器包括6000米耐压电缆(1)、信号连接线母头耐压外壳(2)、4针信号连接线公头(3)、密封O型圈(4)、螺母锁紧件(5)、快速温度采集电路板耐压外壳(6)、快速温度探头延伸杆(7)和裸封FP07热敏电阻(8)，其中信号连接线母头耐压外壳(2)与4针信号连接线公头(3)之间采用锁紧机构。本实用新型结构简单，其不仅适用于在移动潜器上使用，还针对海洋环境的特殊性以及海洋温度测量的精度要求，可应用于深海动态移动平台或固定监测系统中，并设计兼容性连接端口，可与其它传感器同时使用。
The utility model discloses a microstructure fast temperature sensor and a miniaturized acquisition circuit thereof. The microstructure fast temperature sensor comprises a 6000-meter pressure-resistant cable (1), a signal-connecting wire female pressure-resistant casing (2), a 4-pin Signal connection cable male (3), sealing O-ring (4), nut locking piece (5), quick temperature acquisition circuit board pressure housing (6), quick temperature probe extension rod (7) and bare seal FP07 thermal A varistor (8), wherein a locking mechanism is adopted between the pressure-resistant housing (2) of the female head of the signal connection wire and the male head (3) of the 4-pin signal connection wire. The utility model has a simple structure, is not only suitable for use on a mobile submersible, but also can be applied to a deep-sea dynamic mobile platform or a fixed monitoring system according to the particularity of the marine environment and the accuracy requirements of the ocean temperature measurement, and is designed with a compatible connection port, which can be used simultaneously with other sensors.
Description
Technical field
The utility model belongs to temperature detection technical field, and in particular to a kind of micro-structure fast temperature sensor and small-sized
Change Acquisition Circuit, it is suitable for oceanic turbulence observations.
Background technique
Oceanic turbulence mixing is vital research hotspot in physical oceangraphy, has become and restricts in ocean research very
The multi-field key factor further goed deep into and developed；In current research, to oceanic turbulence mix carry out deeper into
Research, then dependent in oceanographic observation introduce high-resolution, large capacity intelligentized rapid survey instrument.It is fast at these
In fast measuring instrument, ocean temperature measuring instrument is instrument that is very crucial and being used widely.More it is essential that quickly
Temperature sensor has significant application value in terms of marine motor, drive marine and ocean circulation research.Wherein, quickly
Temperature sensor is one of the core component of oceanic turbulence research, and improves the key factor of oceanic turbulence monitoring technology level
One of.
In terms of the research of fast temperature sensor, Osborn and Cox in 1972, which is proposed, calculates turbulence flux
Calculation formula (1.1), wherein requiring the dissipative shock wave of calculating ocean temperature:
Here DTIt is thermal diffusivity, ΨTZIt (k) is temperature gradient spectrum.Wherein, the sample frequency of temp probe is higher, temperature
It spends gradient and composes ψTz(k) more accurate, temperature dissipation rate χ obtainedTMore accurate, people have carried out a series of effort thus, most
Representative research has: Gregg and Meagher uses Thermistor to measure temperature gradient as temp probe within 1980,
And obtain temperature dissipation rate；The HRP shear profiler of the institute of oceanography Woods Hole, U.S. research and development in 1988, will high-precision
Temperature sensor be mounted on shear profiler；Oregon state university, U.S. Nash in 1999 et al. uses thermocouple as fastly
Fast temperature sensor, time constant 0.8ms, sample frequency reach 200Hz, and spatial resolution reaches 0.8mm, however this temperature
The encapsulation technology requirement for spending sensor is very high, and signal noise is also bigger, and actual measurement instrument is not easy using so far without phase
Product is closed to introduce to the market；H.Yamazaki professor and the Canada of later Japan Tokyo University of Fishers
University of Victoria professor R.Lueck has developed turbulent flow minute structure profiling observation instrument cooperatively, by Japanese sub-
The production of (ALEC) company is made every effort to overcome, is used on turbulent flow minute structure profiling observation instrument raw by Thermometrics company, the U.S.
The FP07Thermistor fast temperature sensor of production, the temperature-measuring range of this sensor are -5~+45 degree, resolution ratio 0.001
Degree, is preferable one kind in current similar product, and Duo Jia ocean research mechanism, China and university have purchased their product.In recent years
Come, the VMP series of Canadian Rockland company production, German ISW washer company and sea&sun company develop MSS system
Arranging on the subtle structure profiling observation instrument of turbulent flow that they are produced has fast temperature sensor.But such fast temperature sensor technology
China is blocked；Even if schematically being disclosed in some data and principle or frame disclosing, according to disclosed letter
Breath hardly results in specific exploitation and production；Even if sacrificing the resolution ratio of several orders of magnitude, production can be practical adaptable
There is also many technical problems for product.
In order to break through the limitation of foreign technology, China is in terms of the development of temperature sensor, 863 project in Tenth-Five Year Plan
Once 02 special topic of 812 projects was supported, this purpose temperature sensor time constant is 70ms, and efficiently sampling frequency should be less than
14Hz.In addition, the high pressure resistant temperature sensor time constant of domestic thermistor development is 20-50ms, efficiently sampling frequency
Rate should be 20-50Hz.Our research teams are at Eleventh Five-Year Plan national " 863 " quest projects " hydrospace detection fast temperature sensor "
Under the support of (2007AA09Z104), has developed and respond most fast temperature sensor in the world at present, response time 7ms,
17 AD of highest convert precision, and highest sample frequency is up to 143Hz.China's microstructure temperature section plotter has been filled up in this research
Blank.Since this fast temperature sensor is exclusively used in micro-structure profiling observation, it is applicable in 500 meters of the depth of water, volume is big, but is not suitable for
It is used on mobile latent device.In order to be more widely used in actual job ocean, on the basis of original research, into one
Optimization design is walked, volume is reduced, makes it that can be used in 4500 meters of deep-sea, and match by interface form with Other Instruments and vehicle
It is very necessary, and be badly in need of.
Utility model content
To solve the above-mentioned problems, the present inventor, by repeatedly designing and studying, proposes one on original Research foundation
Kind micro-structure fast temperature sensor and miniaturization Acquisition Circuit are applicable not only to use on mobile latent device, also directed to sea
The required precision of particularity and the ocean temperature measurement of foreign environment, can be applied to deep-sea dynamic mobile platform or stationary monitoring system
In system, and design compatibility connectivity port, it can be used simultaneously with other sensors.
According to technical solutions of the utility model in a first aspect, providing a kind of micro-structure fast temperature sensor comprising
6000 meters of resistance to voltage cables 1, signal connecting line female pressure casing 2,4 needle signal connecting line male connectors 3, seal O-ring 4, nut lock
Tight part 5, fast temperature collecting circuit board pressure casing 6, fast temperature probe extension rod 7 and naked envelope FP07 thermistor 8, wherein
Retaining mechanism is used between signal connecting line female pressure casing 2 and 4 needle signal connecting line male connectors 3.
Wherein, 4 needle signal connecting line male connectors 3 be used for the signal of fast temperature collecting circuit board be transmitted to cable and
By cable power supply fast temperature collecting circuit board.Seal O-ring 4, for making isolated signal connecting line female
The needle signal connecting line of pressure casing 2 and 4 male connector 3 is installed together.Nut check part 5 is resistance to for isolated 6000 meters of two parts
Voltage cable 1 and signal connecting line female pressure casing 2 and 4 needle signal connecting line male connectors 3 to naked envelope FP07 thermistor 8 are locked.
Further, fast temperature collecting circuit board pressure casing 6, for putting fast temperature collecting circuit board.
Preferably, fast temperature probe extension rod 7, for connecting fast temperature collecting circuit board and naked envelope FP07 temperature-sensitive
Resistance.
It is highly preferred that FP07 thermistor naked envelope temperature sensing device front end do not have it is any block, do not influence its thermal response time.
According to the second aspect of technical solutions of the utility model, provide a kind of suitable for above-mentioned micro-structure fast temperature sensing
Miniaturization Acquisition Circuit in device, wherein bridge excitation circuit acquires signal, and after compensated circuit, signal is AD converted, warp
Collected electric signal is switched to temperature signal by digital control circuit, using telecommunication circuit signal be transmitted to system master device into
Row processing.
It is compared to existing temperature sensor, a kind of micro-structure fast temperature sensor of the utility model and miniaturization are adopted
Its structure of collector is easily achieved, and manufacture difficulty is low, long service life, and index is stablized, suitable for using on mobile latent device, also
The required precision of particularity and ocean temperature measurement for marine environment, can be applied to deep-sea dynamic mobile platform or fixation
In monitoring system, and design compatibility connectivity port, it can be used simultaneously with other sensors.It is with small in size, high frequency sampling
The good technical advantage of performance.
Detailed description of the invention
Fig. 1 is the appearance schematic diagram of the micro-structure fast temperature sensor of the utility model；
Fig. 2 is the fast temperature sensor microcircuit measured drawing of the utility model；
Fig. 3 is the actual measurement fluctuating temperature time series distribution map using the utility model fast temperature sensor；
Fig. 4 is the actual measurement fluctuating temperature value probability distribution graph using the utility model fast temperature sensor；
Fig. 5 is the electronic system circuitry block diagram of the utility model fast temperature sensor.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.In addition, should not be by the guarantor of the utility model
Shield range shall be limited only to following specific structures or component or design parameter.
The utility model is a kind of micro-structure fast temperature sensor and miniaturization Acquisition Circuit, fast temperature sensor
Use FP07 quick response thermistor as pedestal sensor part, converts the variation of resistance value to using electric bridge the change of voltage
Change value will with 24 ∑s-Δ type A/D conversion devices after being amplified using programmable gain amplifier (PGA) to voltage signal
Analog signal is converted into digital signal.The resistance value of thermistor and the relationship of temperature be it is nonlinear, electric bridge transformation in there is also
It is non-linear, it is therefore desirable to carry out linear transformation for collected voltage and be converted to temperature value.Linear transformation by microprocessor into
Row, microprocessor are also integrated with Interface for digital communication, and half-duplex RS -485 or TTL-232 standard communication protocol is selected to work
Scheme control and data transmission.Fast temperature sensor realizes that the response time, can over-sampling for 7ms, -3dB response frequency 143Hz
To 512Hz.0.002 DEG C of temperature measurement accuracy, 0.0005 DEG C of resolution ratio (64Hz).It is powered using 5V, maximum power dissipation 0.04W, to
Machine power consumption 0.001W.
Circuit board uses 4-6 laminate, by the way of the arrangement of device double-sided high density, to further reduce original PCB ruler
It is very little.In wires design, outer layer includes Toplayer and Bottomlayer is set as ground plane, and signal wire is only walked can be direct
Connection, intermediate layer 2-4 is signal/bus plane, and the power supply the wide line cabling in middle layer mostly covers copper using power supply as far as possible,
This can make the path impedance of source current low, be optimal PCB construction from the point of view of EMI (electromagnetic interference) control.
Specifically, the micro-structure fast temperature sensor of the utility model includes following part: 6000 meters of resistance to voltage cables, letters
Number connecting line female pressure casing, 4 needle signal connecting line male connectors, seal O-ring, nut check part, fast temperature Acquisition Circuit
Plate pressure casing, fast temperature probe extension rod and naked envelope FP07 thermistor.Wherein 4 needle signal connecting line male connectors use just
In each component of replacement.Micro-structure fast temperature sensor bulk described in the utility model is small, conveniently replaced each first device
Part, the response time is short, and sample frequency is fast, high resolution, and can be applied in deep-sea dynamic mobile platform or stationary monitoring system,
And design compatibility connectivity port, it can be used simultaneously with other sensors.Further, it is sensed in the micro-structure fast temperature
In the miniaturization Acquisition Circuit used in device, signal is acquired using bridge excitation circuit, after compensated circuit, signal carries out AD
Collected electric signal, is switched to temperature signal through digital control circuit, signal is transmitted to system using telecommunication circuit by conversion
Main controller is handled.
The utility model is observed at 4000 meters of deep-seas, and fast temperature sensor chief technology is as follows:
1. using the encapsulating structure of pressure resistance 50MPa or more, the encapsulating structure of pressure resistance 50MPa or more is designed, to adapt to 4000
The pressure of meter Shui Shen；
2. the temperature element of FP07 is made to be in naked envelope state, such encapsulating structure does not influence the response of FP07 thermistor
Time, and then improve response speed；
3. passing through test of many times, the resolution ratio response for designing Acquisition Circuit will at least be reached in 10 DEG C of temperature-measuring range intrinsic resolutions
To 0.0005 DEG C；It is available in this way in deep-sea to be widely applied, and the temperature fluctuation for further adapting to deep-sea is less than shallowly
The situation in sea.
Micro-structure fast temperature sensor as shown in Figure 1, wherein Fig. 1 appended drawing reference is respectively as follows: 6000 meters of resistance to voltage cables
1, signal connecting line female pressure casing 2；4 needle signal connecting line male connectors 3, for the signal of fast temperature collecting circuit board to be passed
It is sent to cable and by cable power supply fast temperature collecting circuit board；Seal O-ring 4, for making separation
6000 meters of resistance to voltage cables 1 and signal connecting line female pressure casing 2 and 4 needle signal connecting line male connectors 3 are electric to naked envelope FP07 temperature-sensitive
It is good that resistance 8 is installed together sealing effect；Nut check part 5 is connected for 6000 meters of two parts isolated resistance to voltage cables 1 with signal
Line female pressure casing 2 and 4 needle signal connecting line male connectors 3 to naked envelope FP07 thermistor 8 are locked；Fast temperature collecting circuit board
Pressure casing 6, for putting fast temperature collecting circuit board；Fast temperature probe extension rod 7, for connecting fast temperature acquisition electricity
Road plate and naked envelope FP07 thermistor；Naked envelope FP07 thermistor 8.In Fig. 1, FP07 thermistor naked envelope temperature sensing device front end
Do not have it is any block, do not influence its thermal response time.Fast temperature collection plate only has the face 6mm*45mm after miniaturization is handled
Product, is packaged in position shown in the appended drawing reference 6 in Fig. 1, the length of transmission line of FP07 leading portion to collection plate only has 12cm, reaches
The requirement of " length of transmission line is no more than 20cm ".4 needle signal connecting line male connectors 3, seal O-ring 4, nut check in Fig. 1
Part 5, fast temperature collecting circuit board pressure casing 6, fast temperature probe extension rod 7, naked envelope FP07 thermistor 8 constitute independence
Complete encapsulation, after FP07 damage, it is only necessary to replace this element, the calibration coefficient of FP07 is stored on collection plate, more
Do not have to reconfigure after changing, realizes general low cost replacement.
The width of fast temperature collection plate is 6mm, and the internal diameter of pressure casing is designed as 6.3mm, is added using TC4 bar
Work, using the standard value 825MPa of the material yield strength when calculating, according to 50MPa pressure resistance, the index that safety coefficient is 2, root
According to the correlation formula in design considerations about pressure casing, calculates its minimum outer diameter and need 7.5mm, outer diameter is taken as in the design
9mm is entirely capable of reaching resistance to pressure request.
The electronic system of fast temperature probe is shown in Fig. 5, uses FP07 thermistor as temperature-sensing element, heat in water
Response time is 7ms, and the measuring resistance of FP07 and Low Drift Temperature, high stability constitutes non-equilibrium bridge for measuring temperature, using slow in electric bridge
Fast thermistor (RT1) has extremely low drift speed and long-time stability；FP07 pops one's head in resistance (RT2) response fastly but drifts about
Rate is also larger.Fast temperature drift can be calibrated by slow temperature by being used in combination with RT2.As shown, electric bridge periphery uses
Field-effect tube constitutes ac-excited switch.
In actual fabrication circuitry processes, the lead material of PCB (printed circuit board) is generally chemical copper, and welds electronics
Component generally uses tin, and the material of pin of electronic device is also varied, and different metal, which is attached, can generate thermocouple effect
It answers, thermocouple electromotive force can vary with temperature and change.The influence of thermocouple electromotive force, this Shen are eliminated in precise temperature measurement
It please use ac-excited electric bridge, ac-excited thermocouple, imbalance and the drift effect for solving continuous current excitation application and encountering of electric bridge
Problem is answered, DC error is eliminated.
An arm by FP07 as electric bridge reacts when the temperature is changed for thermistor variation.When electric bridge is unbalance,
There is exciting current to pass through in electric bridge, due to FP07 be it is nonlinear, the utility model by a compensation circuit make output letter
It number is converted in a linear relationship when resistance signal, signal is then converted from analog into digital signal by converter.
Our uses of the converter of thermometric front end have the AD7195 chip of ac-excited function.AD7195 is that the promise of U.S. Ya De is partly led
The outstanding analog-digital converter of body company integrates a low noise, 24 sigma-delta type analog-to-digital converter (ADC).Low noise increases in piece
Beneficial grade means that small signal can be directly inputted.It is ac-excited built in AD7195, for eliminating the induction of the direct current in bridge type magnetic sensor
Biasing is suitble to high-acruracy survey application.
The power circuit and digital signal processing circuit of fast temperature measuring circuit, it is mono- using the PIC16F690 of low-power consumption
Piece machine is as signal processor, and it is temperature signal that the bridge voltage by AD conversion is handled by single-chip microcontroller, with 24 bits
According to the form of stream, system master controller is sent to by RS-485 communication interface, is further processed by master controller and is saved.
RS-485 is half-duplex bidirectional communication interface, and master controller sends synchronous triggering command to PIC16F690 single-chip microcontroller, realizes temperature
The controlled acquisition of signal.
Fast temperature is popped one's head in temperature measuring circuit board pictorial diagram such as Fig. 2, the ultra-small volume of circuit board size 6mm*45mm and highly dense
Degree arrangement.
In practical applications, the fast temperature probing shell of the application design has pressure resistance 50MPa, FP07 in encapsulating structure
Temp probe is in naked envelope state, and the thermal response time of 7ms is unaffected；The fast temperature Acquisition Circuit of optimization design can divide
Distinguish 0.0002 DEG C of temperature fluctuation；Acquisition Circuit is the ultra-small volume of 6*45mm, is directly packaged in titanium alloy pressure casing, away from
Length of transmission line from FP07 is less than 14cm, meets low noise measurement request；Can plug fast temperature sonde configuration, convenient for more
It changes, realizes low cost application.
According to the sea examination temperature fluctuation data that in September, 2014 is observed deeply in 4033 meters of seas, 9 hours total 1036800 are taken
A data point carries out high pass (1s) filtering, and the fluctuating temperature time series distribution for drawing measurement is as shown in Figure 3.
Probability distribution is drawn to high frequency (being greater than 1Hz) signal, is normalized by maximum value, the probability distribution of thermometric such as Fig. 4
Shown, wherein σ=1.39 × 10-4 (K) is the root mean square of high-frequency signal, and the temperature signal being distributed in the section [- σ, σ] accounts for
73% ratio, thus measure fast temperature probe thermometric can differentiate 0.139mK.
The electronic system circuitry block diagram of the utility model fast temperature sensor as shown in Figure 5.Thermistor FP07 makees
For an arm of electric bridge, when electric bridge is unbalance, there is exciting current to pass through in electric bridge, since FP07 is nonlinear, the utility model
Keep the signal exported in a linear relationship when being converted to resistance signal by a compensation circuit, signal is then passed through converter
It is converted from analog into digital signal.Digital Signals circuit is handled the bridge voltage of AD conversion for temperature by single-chip microcontroller
Degree signal system master controller is sent to by communication interface in the form of 24 bit binary data streams, by master controller do into
The processing of one step and preservation.Master controller sends synchronous triggering command by half-duplex bidirectional communication interface, realizes temperature signal
Controlled acquisition.
The utility model is structurally reasonable, novel, while guaranteeing good detection index, takes into account safe, energy saving, beauty
Feature.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in
Change or replacement, should be covered within the scope of the utility model.Those skilled in the art is appreciated that
In the case where the spirit and scope of the present invention defined without departing substantially from appended claims, it can make in form and detail each
The modification of kind various kinds.
Claims (2)
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| CN201721184421.XU CN208937210U (en) | 2017-09-15 | 2017-09-15 | A microstructure fast temperature sensor and miniaturized acquisition circuit |
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|---|---|---|---|
| CN201721184421.XU CN208937210U (en) | 2017-09-15 | 2017-09-15 | A microstructure fast temperature sensor and miniaturized acquisition circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526828A (en) * | 2022-01-28 | 2022-05-24 | 中国科学院合肥物质科学研究院 | High-speed temperature pulsation measuring instrument and method for balloon sounding platform |
| CN115683378A (en) * | 2022-09-08 | 2023-02-03 | 中国科学院合肥物质科学研究院 | Miniature columnar low-temperature sensor material structure |
-
2017
- 2017-09-15 CN CN201721184421.XU patent/CN208937210U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526828A (en) * | 2022-01-28 | 2022-05-24 | 中国科学院合肥物质科学研究院 | High-speed temperature pulsation measuring instrument and method for balloon sounding platform |
| CN115683378A (en) * | 2022-09-08 | 2023-02-03 | 中国科学院合肥物质科学研究院 | Miniature columnar low-temperature sensor material structure |
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