CN104266775B - High-precision temperature sensor applied to internet of things - Google Patents

Abstract

The invention relates to a high-precision temperature sensor applied to the internet of things. The high-precision temperature sensor comprises at least two temperature signal detection modules, a signal receiving module, a temperature calculation module and a power supply module, wherein the power supply module is used for supplying power to the temperature sensor; the temperature signal detection modules are used for detecting the temperature of locations and sending temperature signals to the signal receiving module; the signal receiving module is used for receiving the temperature signals and processing the signals and then transmitting the signals to the temperature calculation module; the temperature calculation module is used for receiving the temperature signals and then calculating the temperature measurement value. Thus, the influence of non-uniform distribution of temperature on temperature measurement can be eliminated, and the accuracy of temperature measurement and the measurement precision are improved.

Description

A kind of temperature sensors of high precision being applied to Internet of Things

Technical field

The present invention relates to temperature sensor technology field is and in particular to a kind of high-precision temperature being applied to Internet of Things senses Device.

Background technology

Internet of Things refers to by various information sensing equipment, Real-time Collection is any to be needed to monitor, connect, interactive object or The information of the various needs such as process, the huge network combining to form with the Internet.Its objective is to realize thing and thing, thing with People, all of article and the connection of network, conveniently identify, manage and control.Temperature sensor is the important composition portion of Internet of Things Point, carry the vital task of collecting temperature data.The temperature data that the characteristic of Internet of Things determines its collection needs to reach very High precision, just more accurately can be controlled to relevant device.But it needs the use of some electrical equipment detection zone Nei to make Temperature distributing disproportionation is even, even if same body surface, as the problem of material and in local, the prominent of temperature may occur Become, so result in temperature sensor collection error in data larger it is difficult to meet the needs of Internet of Things.

In view of drawbacks described above, creator of the present invention passes through long research and test finally proposes and is applied to Internet of Things Temperature sensors of high precision.

Content of the invention

It is an object of the invention to provide a kind of temperature sensors of high precision being applied to Internet of Things, in order to overcome above-mentioned skill Art defect.

For achieving the above object, the technical solution used in the present invention is：A kind of high accuracy being applied to Internet of Things is provided Temperature sensor, it includes：At least two temperatures signal detection module, a signal receiving module, a temperature computation module and an electricity Source module；Described power module is powered to described temperature sensor；Described temperature signal detection module detects the temperature of present position Degree, and temperature signal is sent to described signal receiving module；Described signal receiving module receives described temperature signal, at it Transmit after reason to described temperature computation module；Described temperature computation module calculates temperature survey after receiving described temperature signal It is worth, the computing formula of described measured temperature T is：

Wherein, Q_ij、N_ijComputing formula be：

In formula, i is the sequence number of temperature signal detection module, and j is measurement in the single temperature signal detection module unit interval The order of temperature signal, n is the quantity of temperature signal detection module, and N is that in the unit time, single temperature signal detection module is surveyed The total degree of amount, K is the reasonable fluctuation multiple of temperature, T_ijSurvey for i-th temperature signal detection module jth time within the unit interval The temperature signal of amount, P_ijFor temperature signal T_ijBased on the time judgment value of single temperature signal detection module difference detection time, Q_ijIt is and P_ijCorresponding time decision content, M_ijFor temperature signal T_ijMould based on same time different temperatures signal detection module Block judgment value, N_ijIt is and M_ijCorresponding module decision content,It is respectively P_ij、M_ijFractional part,Point Wei not P_ij、M_ijInteger part.

Preferably, described temperature signal detection module includes：The critesistor that is sequentially connected by series system, an electricity Stream detection sub-module and signal transmitting submodule；The temperature change of present position is converted to electric current and becomes by described critesistor Change；Described current detecting submodule detects the current value of described electric current, and testing result is passed through described signal transmitting submodule Launch.

Preferably, described current detecting submodule is identical with described signal transmitting submodule current-carrying part material.

Preferably, described temperature signal detection module also includes a measured value calculating sub module, described measured value calculates son Module receives the described current value of described current detecting submodule detection, is sent out by described signal after calculating described temperature signal Penetrate submodule to launch；Described measured value calculating sub module calculates described temperature signal T_ijFormula be：

In above formula, U is the voltage at temperature signal detection module two ends, I_ijFor electric current in i-th temperature signal detection module The jth primary current value of detection sub-module detection, R_1iFor in i-th temperature signal detection module in addition to critesistor remaining components and parts Resistance value when 0 DEG C, α_1iFor in i-th temperature signal detection module in addition to critesistor remaining components and parts current-carrying part temperature Degree coefficient, R_2iFor critesistor resistance value at normal temperatures in i-th temperature signal detection module, B is the temperature-sensitive of critesistor Index, t is the Celsius temperature of room temperature.

Preferably, described temperature sensor also includes a display module, described display module receives described temperature computation mould The described measured temperature of block transmission simultaneously shows in real time.

Preferably, described current detecting submodule is a resistance frequency converting submodule, it includes the electricity being sequentially connected Appearance, a comparison circuit and a counting circuit.

Preferably, the first end of described critesistor is connected to high level by switch, the second end connects described electric capacity First end and the input of described comparison circuit, the second end of described electric capacity connects low level, the outfan of described comparison circuit Connect described counting circuit.

Preferably, described comparison circuit includes a first comparator and one second comparator, the one of described first comparator One input of individual input and described second comparator is connected to the second end of described critesistor, described first comparator Another input connect high level, another input of described second comparator connects low level, and described first compares The outfan of device and described second comparator connects logic circuit, and described logic circuit controls described switch.

A kind of situation is that described temperature sensor is integral type structure, after multiple described temperature signal detection module parallel connections Connect with described signal receiving module, described temperature computation module.

Another kind of situation is that described temperature sensor is split-type structural, and described signal launches submodule and described signal Receiver module transmits described temperature signal by wireless signal mode.

Compared with the prior art the beneficial effects of the present invention is：Provide a kind of high-precision temperature being applied to Internet of Things Sensor, the skewness that can exclude temperature, on thermometric impact, improves thermometric accuracy and measurement Precision；Computing formula is simple, convenient, can quickly obtain result, decrease calculation procedure to prolonging that whole measurement result causes Late it is ensured that the real-time display of measured temperature；Simple calculating process has saved system resource；Remaining unit in addition to critesistor Device is identical material, so it can be avoided that the error that between components and parts, temperature coefficient difference is brought, improves temperature further and surveys The degree of accuracy of amount.

Brief description

Fig. 1 is applied to the structured flowchart of the temperature sensors of high precision of Internet of Things for the present invention；

Fig. 2 is applied to the structural representation of the temperature sensors of high precision temperature signal detection module of Internet of Things for the present invention Figure；

Fig. 3 is applied to the structured flowchart of the temperature sensors of high precision embodiment one of Internet of Things for the present invention；

Fig. 4 is applied to the knot of the temperature sensors of high precision temperature signal detection module embodiment two of Internet of Things for the present invention Structure schematic diagram；

Fig. 5 is applied to the structure of the temperature sensors of high precision current detecting submodule embodiment three of Internet of Things for the present invention Schematic diagram；

Fig. 6 is applied to the circuit of the temperature sensors of high precision current detecting submodule embodiment three of Internet of Things for the present invention Schematic diagram；

Fig. 7 is applied to the circuit of the temperature sensors of high precision current detecting submodule example IV of Internet of Things for the present invention Schematic diagram.

Specific embodiment

Below in conjunction with accompanying drawing, the above-mentioned He other technical characteristic of the present invention and advantage are described in more detail.

As shown in figure 1, it is applied to the structured flowchart of the temperature sensors of high precision of Internet of Things for the present invention；Wherein, high Accuracy temperature sensor includes：Temperature signal detection module 1, signal receiving module 2, temperature computation module 3 and power module 5；

Power module 5 is powered to temperature sensors of high precision；

Temperature signal detection module 1 detects the temperature of present position, and temperature signal is emitted, and temperature signal detects The quantity of module 1 is at least two, from each other for coordination；

Signal receiving module 2 receives the temperature signal of temperature signal detection module 1 transmitting, and it is processed, and processes Temperature signal afterwards transmits to temperature computation module 3；

Measured temperature T, temperature is calculated after the temperature signal of temperature computation module 3 receipt signal receiver module 2 transmission The computing formula of measured value T is：

Wherein, Q_ij、N_ijComputing formula be：

In formula, i is the sequence number of temperature signal detection module, and j is measurement in the single temperature signal detection module unit interval The order of temperature signal, n is the quantity of temperature signal detection module, and N is that in the unit time, single temperature signal detection module is surveyed The total degree of amount, K is the reasonable fluctuation multiple of temperature, T_ijSurvey for i-th temperature signal detection module jth time within the unit interval The temperature signal of amount, P_ijFor temperature signal T_ijBased on the time judgment value of single temperature signal detection module difference detection time, Q_ijIt is and P_ijCorresponding time decision content, M_ijFor temperature signal T_ijMould based on same time different temperatures signal detection module Block judgment value, N_ijIt is and M_ijCorresponding module decision content,It is respectively P_ij、M_ijFractional part,Respectively For P_ij、M_ijInteger part.

K is the reasonable fluctuation multiple of temperature, and the meaning is temperature T_ijThe meansigma methodss measuring in front and back with its meansigma methods or twice Difference in interval (T_ij-T_ijK, T_ij+T_ijK in).

Above-mentioned thinking is：First determine the difference of measurement temperature and its meansigma methods and temperature with its before and after twice measured value put down The ratio of the difference of average, difference and this temperature is again divided by the judgment value as follow-up judge for the multiple that reasonably fluctuates；To judgement The fractional part of value is double round downwards after with its integer part and after Jia one inverted for corresponding decision content；Retain two Measurement temperature that decision content is all not zero simultaneously is averaged value as final measured temperature.

Have the beneficial effect that：The difference of measurement temperature and meansigma methodss is converted to by decision content by inverted and rounding operation, Thus each measurement temperature being retained in the range of reasonable fluctuation multiple calculates last measured temperature, this eliminates temperature The skewness of degree, on thermometric impact, improves thermometric accuracy and certainty of measurement；Computing formula is simple, Convenient, can quickly obtain result, decrease the calculation procedure having more to the delay causing of whole measurement result it is ensured that temperature The real-time display of degree measured value, it is true that the data display of multiple measurement, computing module to measured temperature, prolong by real-time display It is less than 0.1ms late, meanwhile, simple calculating process has saved system resource.

As shown in Fig. 2 it is applied to the temperature sensors of high precision temperature signal detection module of Internet of Things for the present invention Structural representation；Wherein, single temperature signal detection module 1 includes：One critesistor 11, a current detecting submodule 12 and Signal launches submodule 13, and three is sequentially connected by way of series connection；

Critesistor 11 is according to the temperature change self-resistance value of present position, and then causes the change of electric current；

Current detecting submodule 12 detects the current value of whole circuit, and testing result is transmitted to signal transmitting submodule 13；

Signal transmitting submodule 13 receives described testing result and launches testing result.

Embodiment one

Temperature sensors of high precision as described above, the present embodiment is different from part and is, as shown in figure 3, it is The present invention is applied to the structured flowchart of the temperature sensors of high precision embodiment one of Internet of Things；Wherein, described high-precision temperature passes Sensor also includes a display module 4, and it receives the measured temperature of temperature computation module 3 transmission and shows in real time.

Embodiment two

Temperature sensors of high precision as described above, the present embodiment is different from part and is, as shown in figure 4, it is The present invention is applied to the structural representation of the temperature sensors of high precision temperature signal detection module embodiment two of Internet of Things；Its In, single temperature signal detection module 1 also includes a measured value calculating sub module 14, and measured value calculating sub module 14 receives electric current The testing result of detection sub-module 12, calculates temperature signal, and temperature signal is transmitted to signal transmitting submodule 13；Signal Transmitting submodule 13 receives described temperature signal and launches temperature signal.Critesistor 11, current detecting submodule 12, Measured value calculating sub module 14 and signal transmitting submodule 13 are sequentially connected by way of series connection.

Measured value calculating sub module 14 calculates temperature signal T_ijComputing formula be：

In above formula, U is the voltage at temperature signal detection module 1 two ends, I_ijFor electric current in i-th temperature signal detection module The jth primary current value of detection sub-module 12 detection, R_1iFor in i-th temperature signal detection module in addition to critesistor 11 remaining unit The resistance value when 0 DEG C for the device, α_1iFor in i-th temperature signal detection module in addition to critesistor 11 remaining components and parts resistance Temperature coefficient, R_2iFor critesistor 11 resistance value at normal temperatures in i-th temperature signal detection module, B is critesistor 11 Heat sensitive index, t be room temperature Celsius temperature.

In the present embodiment in addition to critesistor 11 remaining components and parts flow through at electric current be current-carrying part be identical material, so It can be avoided that the error that between components and parts, temperature coefficient difference is brought, improve thermometric degree of accuracy further.

Embodiment three

Temperature sensors of high precision as described above, the present embodiment is different from part and is, as shown in figure 5, it is The present invention is applied to the structural representation of the temperature sensors of high precision current detecting submodule embodiment three of Internet of Things；Wherein, Current detecting submodule 12 is R-F (resistance-frequency) change-over circuit, and it includes an electric capacity 121, a comparison circuit 122 and a meter Number circuit 123；

As shown in fig. 6, its temperature sensors of high precision current detecting submodule being applied to Internet of Things for the present invention is implemented The circuit diagram of example three；Wherein, the first end of described critesistor is connected to high level by switching 124, described temperature-sensitive electricity Second end of resistance 11 connects the first end of electric capacity 121, and the second end of described electric capacity 121 connects low level, described critesistor 11 Second end connect comparison circuit 122 input, the outfan connection count circuit 123 of described comparison circuit 122；

When the current potential at critesistor 11 second end be less than the setting value of comparison circuit 122 then comparison circuit 122 control described Switch 124 makes the first end of described critesistor 11 connect high potential makes described electric capacity 121 charge, when critesistor 11 second end Current potential be higher than that then comparison circuit 122 controls described switch 124 to make the of described critesistor 11 for the setting value of comparison circuit 122 One end connects electronegative potential makes described electric capacity 121 discharge；

Described counting circuit 123 is used for measuring the discharge and recharge frequency of described electric capacity 121, thus obtaining the resistance of critesistor 11 Value changes, obtain the change of critesistor 11 temperature further.

Example IV

Temperature sensors of high precision as described above, the present embodiment is different from part and is, as shown in fig. 7, it is The present invention is applied to the circuit diagram of the temperature sensors of high precision current detecting submodule example IV of Internet of Things；Wherein, The first end of described critesistor 11 is passed through switch 124 and is connected to high level, and the second end of described critesistor 11 connects electric capacity 121 first end, the second end of described electric capacity 121 connects low level, and the second end of described critesistor 11 connects comparison circuit 122 input, the outfan connection count circuit 123 of described comparison circuit 122；

When the current potential at critesistor 11 second end be less than the setting value of comparison circuit 122 then comparison circuit 122 control described Switch 124 makes the first end of described critesistor 11 connect high potential makes described electric capacity 121 charge, when critesistor 11 second end Current potential be higher than that then comparison circuit 122 controls described switch 124 to make the of described critesistor 11 for the setting value of comparison circuit 122 One end connects electronegative potential makes described electric capacity 121 discharge；Described counting circuit 123 is used for measuring the discharge and recharge frequency of described electric capacity 121 Rate, thus obtaining the change in resistance of critesistor 11, obtains the change of critesistor 11 temperature further.

Wherein comparison circuit 122 includes two comparators, an input of first comparator 1221 and the second comparator 1222 input is connected to the second end of critesistor 11, and another input of first comparator 1221 connects high electricity Flat, the second input of the second comparator 1222 connects low level, the output of first comparator 1221 and the second comparator 1222 End is connected to logic circuit 125, and logic circuit 125 controls the switch 124 connecting critesistor 11 first end.

Embodiment five

Temperature sensors of high precision as described above, the present embodiment is different from part and is, described high-precision temperature Sensor is integral type structure, and temperature signal detection module 1, signal receiving module 2, temperature computation module 3 and power module 5 are altogether With combining, connect with signal receiving module 2, temperature computation module 3 after the parallel connection of multiple temperature signal detection module 1, multiple temperature Signal detection module 1 both end voltage is identical, and multiple signal transmitting submodules 13 are connected by wire with signal receiving module 2, temperature Degree computing module 3 be one independent of Internet of Things computing module.

Embodiment six

As described temperature sensors of high precision arbitrary in embodiment one to four, the present embodiment is different from part and is, Described temperature sensors of high precision is split-type structural, and temperature signal detection module 1 is distributed in temperature survey required for Internet of Things Position, signal receiving module 2, temperature computation module 3, power module 5 and correlation module on Internet of Things carry out integrated, Duo Gexin Number transmitting submodule 13 carries out signal transmission with signal receiving module 2 by wireless signal mode.

The foregoing is only presently preferred embodiments of the present invention, be merely illustrative for the purpose of the present invention, and non-limiting 's.Those skilled in the art understands, it can be carried out in the spirit and scope that the claims in the present invention are limited with many changes, Modification, in addition equivalent, but fall within protection scope of the present invention.

Claims (10)

1. a kind of temperature sensors of high precision being applied to Internet of Things is it is characterised in that include：At least two temperatures signal detection mould Block, a signal receiving module, a temperature computation module and a power module；Described power module supplies to described temperature sensor Electricity；Described temperature signal detection module detects the temperature of present position, and temperature signal is sent to described signal receiving module； Described signal receiving module receives described temperature signal, transmits to described temperature computation module after it is processed；Described thermometer Calculate after module receives described temperature signal and calculate measured temperature, the computing formula of described measured temperature T is：

$T=\frac{\underset{i=1}{\overset{n}{\Σ}}\underset{j=2}{\overset{N}{\Σ}}{Q}_{ij}{N}_{ij}{T}_{ij}}{\underset{i=1}{\overset{n}{\Σ}}\underset{j=2}{\overset{N}{\Σ}}{Q}_{ij}{N}_{ij}}$

Wherein, Q_ij、N_ijComputing formula be：

$M_{ij}=\frac{2|T_{ij}-\underset{i=1}{\overset{n}{\Σ}}\frac{T_{ij}}{n}|}{T_{ij}K}$

$P_{ij}=\frac{2|T_{ij}-\frac{T_{i(j-1)}+T_{i(j+1)}}{2}|}{T_{ij}K}$

In formula, i is the sequence number of temperature signal detection module, and j is measurement temperature in the single temperature signal detection module unit interval The order of signal, n is the quantity of temperature signal detection module, and N is single temperature signal detection module measurement in the unit time Total degree, K is the reasonable fluctuation multiple of temperature, T_ijFor i-th temperature signal detection module jth time measurement within the unit interval Temperature signal, P_ijFor temperature signal T_ijBased on the time judgment value of single temperature signal detection module difference detection time, Q_ijFor With P_ijCorresponding time decision content, M_ijFor temperature signal T_ijSentenced based on the module of same time different temperatures signal detection module Disconnected value, N_ijIt is and M_ijCorresponding module decision content,It is respectively P_ij、M_ijFractional part,Respectively For P_ij、M_ijInteger part.

2. the temperature sensors of high precision being applied to Internet of Things according to claim 1 is it is characterised in that described temperature is believed Number detection module includes：A critesistor, a current detecting submodule and the signal transmitting being sequentially connected by series system Submodule；The temperature change of present position is converted to curent change by described critesistor；Described current detecting submodule detection The current value of described curent change, and testing result is launched by described signal transmitting submodule.

3. the temperature sensors of high precision being applied to Internet of Things according to claim 2 is it is characterised in that described electric current is examined Survey submodule identical with described signal transmitting submodule current-carrying part material.

4. the temperature sensors of high precision being applied to Internet of Things according to claim 3 is it is characterised in that described temperature is believed Number detection module also includes a measured value calculating sub module, and described measured value calculating sub module receives described current detecting submodule The described current value of detection, launches submodule by described signal after calculating described temperature signal and launches；Described measurement Value calculating sub module calculates described temperature signal T_ijFormula be：

$\frac{U}{I_{ij}}=R_{1i}*(1+{\mathrm{\α}}_{1i}{T}_{ij})+R_{2i}\exp \[B(\frac{1}{273.15+T_{ij}}-\frac{1}{273.15+t})\]$

In above formula, U is the voltage at temperature signal detection module two ends, I_ijFor current detecting in i-th temperature signal detection module The jth primary current value of submodule detection, R_1iFor in i-th temperature signal detection module in addition to critesistor remaining components and parts 0 DEG C when resistance value, α_1iFor in i-th temperature signal detection module in addition to critesistor remaining components and parts current-carrying part temperature Coefficient, R_2iFor critesistor resistance value at normal temperatures in i-th temperature signal detection module, B is that the temperature-sensitive of critesistor refers to Number, t is the Celsius temperature of room temperature.

5. the temperature sensors of high precision being applied to Internet of Things according to claim 4 is it is characterised in that described temperature passes Sensor also includes a display module, and described display module receives described measured temperature the reality of described temperature computation module transmission When show.

6. the temperature sensors of high precision being applied to Internet of Things according to claim 4 is it is characterised in that described electric current is examined Survey submodule is a resistance frequency converting submodule, and it includes an electric capacity, a comparison circuit and the counting electricity being sequentially connected Road.

7. the temperature sensors of high precision being applied to Internet of Things according to claim 6 is it is characterised in that described temperature-sensitive is electric The first end of resistance is connected to high level by switch, and the second end connects the first end of described electric capacity and the input of described comparison circuit End, the second end of described electric capacity connects low level, and the outfan of described comparison circuit connects described counting circuit.

8. the temperature sensors of high precision being applied to Internet of Things according to claim 7 is it is characterised in that described comparison is electric Road includes a first comparator and one second comparator, an input of described first comparator and described second comparator One input is connected to the second end of described critesistor, and another input of described first comparator connects high level, Another input of described second comparator connects low level, the outfan of described first comparator and described second comparator Connect logic circuit, described logic circuit controls described switch.

9. according to the described temperature sensors of high precision being applied to Internet of Things arbitrary in claim 1-8 it is characterised in that institute Stating temperature sensor is integral type structure, with described signal receiving module, institute after multiple described temperature signal detection module parallel connections State temperature computation module series connection.

10. according to the described temperature sensors of high precision being applied to Internet of Things arbitrary in claim 1-8 it is characterised in that Described temperature sensor is split-type structural, and described signal transmitting submodule passes through wireless signal side with described signal receiving module Formula transmits described temperature signal.