CN104266775A - 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, be specifically related to a kind of temperature sensors of high precision being applied to Internet of Things.

Background technology

Internet of Things refers to by various information sensing equipment, and any information needing the various needs such as monitoring, connection, interactive object or process of Real-time Collection, is combined the huge network formed with internet.Its objective is and realize thing and thing, thing and people, all article and the connection of network, convenient identification, management and control.Temperature sensor is the important component part of Internet of Things, carries the vital task of collecting temperature data.The characteristic of Internet of Things determines its temperature data gathered to be needed to reach very high precision, just can control more accurately relevant device.But it needs the use of some electrical equipment in surveyed area to make temperature distributing disproportionation even, even if same body surface, also can may occur the sudden change of temperature in local because of the problem of material, the data error so just causing temperature sensor to gather is comparatively large, is difficult to the needs meeting Internet of Things.

In view of above-mentioned defect, creator of the present invention is through research and test propose the temperature sensors of high precision being applied to Internet of Things finally for a long time.

Summary of the invention

The object of the present invention is to provide a kind of temperature sensors of high precision being applied to Internet of Things, in order to overcome above-mentioned technological deficiency.

For achieving the above object, the technical solution used in the present invention is: provide a kind of temperature sensors of high precision being applied to Internet of Things, it comprises: at least two temperatures signal detection module, a signal receiving module, a temperature computation module and a power module; Described power module powers to described temperature sensor; 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, transfers to described temperature computation module to after its process; Calculate measured temperature after described temperature computation module receives described temperature signal, the computing formula of described measured temperature T is:

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

Wherein, Q _ij, N _ijcomputing formula be:

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

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

In formula, i is the sequence number of temperature signal detection module, and j is the order of measuring tempeature signal in the single temperature signal detection module unit interval, n is the quantity of temperature signal detection module, N is the total degree that in the unit time, single temperature signal detection module is measured, and K is the reasonable fluctuation multiple of temperature, T _ijbe i-th temperature signal detection module temperature signal that jth time is measured within the unit interval, P _ijfor temperature signal T _ijbased on the time judgment value of single temperature signal detection module different detection time, Q _ijfor with P _ijcorresponding time decision content, M _ijfor temperature signal T _ijbased on the module judgment value of same time different temperatures signal detection module, N _ijfor with M _ijcorresponding module decision content, be respectively P _ij, M _ijfraction part, be respectively P _ij, M _ijintegral part.

Preferably, described temperature signal detection module comprises: the thermistor connected successively by series system, a current detecting submodule and a signal launch submodule; The temperature variation of present position is converted to curent change by described thermistor; Described current detecting submodule detects the current value of described electric current, and testing result is launched by described signal transmitting submodule.

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

Preferably, described temperature signal detection module also comprises a measured value calculating sub module, described measured value calculating sub module receives the described current value that described current detecting submodule detects, and launches submodule launch after calculating described temperature signal by described signal; Described measured value calculating sub module calculates described temperature signal T _ijformula be:

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

In above formula, U is the voltage at temperature signal detection module two ends, I _ijbe the jth primary current value that in i-th temperature signal detection module, current detecting submodule detects, R _1ibe in i-th temperature signal detection module except thermistor the resistance value of all the other components and parts 0 DEG C time, α _1ibe the temperature coefficient of all the other components and parts current-carrying parts except thermistor in i-th temperature signal detection module, R _2ibe thermistor resistance value at normal temperatures in i-th temperature signal detection module, B is the heat sensitive index of thermistor, and t is the Celsius temperature of normal temperature.

Preferably, described temperature sensor also comprises a display module, and described display module receives the described measured temperature of described temperature computation module transfer and shows in real time.

Preferably, described current detecting submodule is a resistance frequency converting submodule, and it comprises the electric capacity, a comparator circuit and the counting circuit that connect successively.

Preferably, the first end of described thermistor is connected to high level by switch, second end connects the first end of described electric capacity and the input end of described comparator circuit, and the second end of described electric capacity connects low level, and the output terminal of described comparator circuit connects described counting circuit.

Preferably, described comparator circuit comprises one first comparer and one second comparer, an input end of described first comparer and an input end of described second comparer are connected to the second end of described thermistor, another input end of described first comparer connects high level, another input end of described second comparer connects low level, described first comparer is connected logical circuit with the output terminal of described second comparer, and described logical circuit controls described switch.

A kind of situation is that described temperature sensor is integral type structure, with described signal receiving module, described temperature computation block coupled in series after the parallel connection of multiple described temperature signal detection module.

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

Beneficial effect of the present invention is compared with the prior art: provide a kind of temperature sensors of high precision being applied to Internet of Things, and the skewness can getting rid of temperature, on thermometric impact, improves thermometric accuracy and measuring accuracy; Computing formula is simple, convenient, can obtain result fast, decrease the delay that calculation procedure causes whole measurement result, ensure that the real-time display of measured temperature; Simple computation process has saved system resource; Except thermistor, all the other components and parts are identical material, can avoid the error that between components and parts, temperature coefficient difference is brought like this, improve thermometric degree of accuracy further.

Accompanying drawing explanation

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

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

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

Fig. 4 is the structural representation that the present invention is applied to the temperature sensors of high precision temperature signal detection module embodiment two of Internet of Things;

Fig. 5 is the structural representation that the present invention is applied to the temperature sensors of high precision current detecting submodule embodiment three of Internet of Things;

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

Fig. 7 is the circuit diagram that the present invention is applied to the temperature sensors of high precision current detecting submodule embodiment four of Internet of Things.

Embodiment

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

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, temperature sensors of high precision comprises: temperature signal detection module 1, signal receiving module 2, temperature computation module 3 and power module 5;

Power module 5 pairs of temperature sensors of high precision are powered;

Temperature signal detection module 1 detects the temperature of present position, and is emitted by temperature signal, and the quantity of temperature signal detection module 1 is at least two, is coordination mutually;

Signal receiving module 2 receives the temperature signal that temperature signal detection module 1 is launched, and processes it, and the temperature signal after process transfers to temperature computation module 3;

Calculate measured temperature T after the temperature signal of temperature computation module 3 Received signal strength receiver module 2 transmission, the computing formula of measured temperature T is:

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

Wherein, Q _ij, N _ijcomputing formula be:

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

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

In formula, i is the sequence number of temperature signal detection module, and j is the order of measuring tempeature signal in the single temperature signal detection module unit interval, n is the quantity of temperature signal detection module, N is the total degree that in the unit time, single temperature signal detection module is measured, and K is the reasonable fluctuation multiple of temperature, T _ijbe i-th temperature signal detection module temperature signal that jth time is measured within the unit interval, P _ijfor temperature signal T _ijbased on the time judgment value of single temperature signal detection module different detection time, Q _ijfor with P _ijcorresponding time decision content, M _ijfor temperature signal T _ijbased on the module judgment value of same time different temperatures signal detection module, N _ijfor with M _ijcorresponding module decision content, be respectively P _ij, M _ijfraction part, be respectively P _ij, M _ijintegral part.

K is the reasonable fluctuation multiple of temperature, is meant to temperature T _ijwith the difference of the mean value of its mean value or front and back twice measurement at interval (T _ij-T _ijk, T _ij+ T _ijk) in.

Above-mentioned thinking is: first determine the difference of measuring tempeature and its mean value and temperature and the difference of twice measured value mean value before and after it, difference therewith temperature ratio again divided by rational fluctuation multiple as the judgment value of follow-up judge; To the fraction part of judgment value is double round downwards after with its integral part and add that to get reciprocal after one be corresponding decision content; Retain all non-vanishing measuring tempeature of two decision contents and using its mean value as final measured temperature.

Beneficial effect is: by getting Reciprocals sums rounding operation, the difference of measuring tempeature and mean value is converted to decision content, thus each measuring tempeature be retained within the scope of reasonable fluctuation multiple calculates last measured temperature, the skewness that this eliminates temperature, on thermometric impact, improves thermometric accuracy and measuring accuracy; Computing formula is simple, convenient, result can be obtained fast, decrease the calculation procedure that has more to the delay caused of whole measurement result, ensure that the real-time display of measured temperature, in fact, the data display of repetitive measurement, computing module is less than 0.1ms to the delay that measured temperature shows in real time, and meanwhile, simple computation process has saved system resource.

As shown in Figure 2, it 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; Wherein, single temperature signal detection module 1 comprises: thermistor 11, current detecting submodule 12 and a signal launch submodule 13, and three is connected successively by the mode of series connection;

Thermistor 11 according to the temperature variation 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 transferred to signal transmitting submodule 13;

Signal is launched submodule 13 and is received described testing result and testing result launched.

Embodiment one

Temperature sensors of high precision as described above, the present embodiment and its difference are, as shown in Figure 3, it is applied to the structured flowchart of the temperature sensors of high precision embodiment one of Internet of Things for the present invention; Wherein, described temperature sensors of high precision also comprises 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 and its difference are, as shown in Figure 4, it is applied to the structural representation of the temperature sensors of high precision temperature signal detection module embodiment two of Internet of Things for the present invention; Wherein, single temperature signal detection module 1 also comprises a measured value calculating sub module 14, and the testing result of measured value calculating sub module 14 received current detection sub-module 12, calculates temperature signal, and temperature signal is transferred to signal transmitting submodule 13; Signal is launched submodule 13 and is received described temperature signal and launched by temperature signal.Thermistor 11, current detecting submodule 12, measured value calculating sub module 14 and signal are launched submodule 13 and are connected successively by the mode of series connection.

Measured value calculating sub module 14 accounting temperature signal T _ijcomputing formula be:

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

In above formula, U is the voltage at temperature signal detection module 1 two ends, I _ijbe the jth primary current value that in i-th temperature signal detection module, current detecting submodule 12 detects, R _1ibe in i-th temperature signal detection module except thermistor 11 resistance value of all the other components and parts 0 DEG C time, α _1ibe the temperature coefficient of all the other components and parts resistance except thermistor 11 in i-th temperature signal detection module, R _2ibe thermistor 11 resistance value at normal temperatures in i-th temperature signal detection module, B is the heat sensitive index of thermistor 11, and t is the Celsius temperature of normal temperature.

In the present embodiment, except thermistor 11, all the other components and parts flow through electric current place and current-carrying part is identical material, can avoid the error that between components and parts, temperature coefficient difference is brought like this, improve thermometric degree of accuracy further.

Embodiment three

Temperature sensors of high precision as described above, the present embodiment and its difference are, as shown in Figure 5, it is applied to the structural representation of the temperature sensors of high precision current detecting submodule embodiment three of Internet of Things for the present invention; Wherein, current detecting submodule 12 is R-F (resistance-frequency) change-over circuit, and it comprises electric capacity 121, one comparator circuit 122 and a counting circuit 123;

As shown in Figure 6, it is applied to the circuit diagram of the temperature sensors of high precision current detecting submodule embodiment three of Internet of Things for the present invention; Wherein, the first end of described thermistor is connected to high level by switch 124, second end of described thermistor 11 connects the first end of electric capacity 121, second end of described electric capacity 121 connects low level, second end of described thermistor 11 connects the input end of comparator circuit 122, the output terminal connection count circuit 123 of described comparator circuit 122;

When thermistor 11 second end current potential lower than comparator circuit 122 setting value then comparator circuit 122 control described switch 124 make the first end of described thermistor 11 connect noble potential described electric capacity 121 is charged, when thermistor 11 second end current potential higher than comparator circuit 122 setting value then comparator circuit 122 control described switch 124 make the first end of described thermistor 11 connect electronegative potential described electric capacity 121 is discharged;

Described counting circuit 123 for measuring the discharge and recharge frequency of described electric capacity 121, thus obtains the change in resistance of thermistor 11, obtains the change of thermistor 11 temperature further.

Embodiment four

Temperature sensors of high precision as described above, the present embodiment and its difference are, as shown in Figure 7, it is applied to the circuit diagram of the temperature sensors of high precision current detecting submodule embodiment four of Internet of Things for the present invention; Wherein, the first end of described thermistor 11 is connected to high level by switch 124, second end of described thermistor 11 connects the first end of electric capacity 121, second end of described electric capacity 121 connects low level, second end of described thermistor 11 connects the input end of comparator circuit 122, the output terminal connection count circuit 123 of described comparator circuit 122;

When thermistor 11 second end current potential lower than comparator circuit 122 setting value then comparator circuit 122 control described switch 124 make the first end of described thermistor 11 connect noble potential described electric capacity 121 is charged, when thermistor 11 second end current potential higher than comparator circuit 122 setting value then comparator circuit 122 control described switch 124 make the first end of described thermistor 11 connect electronegative potential described electric capacity 121 is discharged; Described counting circuit 123 for measuring the discharge and recharge frequency of described electric capacity 121, thus obtains the change in resistance of thermistor 11, obtains the change of thermistor 11 temperature further.

Wherein comparator circuit 122 comprises two comparers, an input end of the first comparer 1221 and an input end of the second comparer 1222 are connected to the second end of thermistor 11, another input end of first comparer 1221 connects high level, second input end of the second comparer 1222 connects low level, the output terminal of the first comparer 1221 and the second comparer 1222 is connected to logical circuit 125, the switch 124 of logical circuit 125 control linkage thermistor 11 first end.

Embodiment five

Temperature sensors of high precision as described above, the present embodiment and its difference are, described temperature sensors of high precision is integral type structure, temperature signal detection module 1, signal receiving module 2, temperature computation module 3 and power module 5 combine jointly, connect with signal receiving module 2, temperature computation module 3 after multiple temperature signal detection module 1 is in parallel, multiple temperature signal detection module 1 both end voltage is identical, multiple signal is launched submodule 13 and is connected by wire with signal receiving module 2, and temperature computation module 3 is one independent of the computing module of Internet of Things.

Embodiment six

As the temperature sensors of high precision as described in arbitrary in embodiment one to four, the present embodiment and its difference are, described temperature sensors of high precision is split-type structural, temperature signal detection module 1 is distributed in thermometric position required for Internet of Things, signal receiving module 2, temperature computation module 3, power module 5 carry out integrated with correlation module on Internet of Things, and multiple signal is launched submodule 13 and carried out Signal transmissions with signal receiving module 2 by wireless signal mode.

The foregoing is only preferred embodiment of the present invention, is only illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes in the spirit and scope that the claims in the present invention limit to it, amendment, even equivalence, but all will fall within the scope of protection of the present invention.

Claims (10)

1. be applied to a temperature sensors of high precision for Internet of Things, it is characterized in that, comprising: at least two temperatures signal detection module, a signal receiving module, a temperature computation module and a power module; Described power module powers to described temperature sensor; 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, transfers to described temperature computation module to after its process; Calculate measured temperature after described temperature computation module receives described temperature signal, the computing formula of described measured temperature T is:

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

Wherein, Q _ij, N _ijcomputing formula be:

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

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

In formula, i is the sequence number of temperature signal detection module, and j is the order of measuring tempeature signal in the single temperature signal detection module unit interval, n is the quantity of temperature signal detection module, N is the total degree that in the unit time, single temperature signal detection module is measured, and K is the reasonable fluctuation multiple of temperature, T _ijbe i-th temperature signal detection module temperature signal that jth time is measured within the unit interval, P _ijfor temperature signal T _ijbased on the time judgment value of single temperature signal detection module different detection time, Q _ijfor with P _ijcorresponding time decision content, M _ijfor temperature signal T _ijbased on the module judgment value of same time different temperatures signal detection module, N _ijfor with M _ijcorresponding module decision content, be respectively P _ij, M _ijfraction part, be respectively P _ij, M _ijintegral part.

2. the temperature sensors of high precision being applied to Internet of Things according to claim 1, is characterized in that, described temperature signal detection module comprises: the thermistor connected successively by series system, a current detecting submodule and a signal launch submodule; The temperature variation of present position is converted to curent change by described thermistor; Described current detecting submodule detects the current value of described electric current, 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 characterized in that, described current detecting submodule is 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, it is characterized in that, described temperature signal detection module also comprises a measured value calculating sub module, described measured value calculating sub module receives the described current value that described current detecting submodule detects, and launches submodule launch after calculating described temperature signal by described signal; Described measured value calculating sub module calculates described temperature signal T _ijformula be:

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

In above formula, U is the voltage at temperature signal detection module two ends, I _ijbe the jth primary current value that in i-th temperature signal detection module, current detecting submodule detects, R _1ibe in i-th temperature signal detection module except thermistor the resistance value of all the other components and parts 0 DEG C time, α _1ibe the temperature coefficient of all the other components and parts current-carrying parts except thermistor in i-th temperature signal detection module, R _2ibe thermistor resistance value at normal temperatures in i-th temperature signal detection module, B is the heat sensitive index of thermistor, and t is the Celsius temperature of normal temperature.

5. the temperature sensors of high precision being applied to Internet of Things according to claim 4, it is characterized in that, described temperature sensor also comprises a display module, and described display module receives the described measured temperature of described temperature computation module transfer and shows in real time.

6. the temperature sensors of high precision being applied to Internet of Things according to claim 4, is characterized in that, described current detecting submodule is a resistance frequency converting submodule, and it comprises the electric capacity, a comparator circuit and the counting circuit that connect successively.

7. the temperature sensors of high precision being applied to Internet of Things according to claim 6, it is characterized in that, the first end of described thermistor is connected to high level by switch, second end connects the first end of described electric capacity and the input end of described comparator circuit, second end of described electric capacity connects low level, and the output terminal of described comparator circuit connects described counting circuit.

8. the temperature sensors of high precision being applied to Internet of Things according to claim 7, it is characterized in that, described comparator circuit comprises one first comparer and one second comparer, an input end of described first comparer and an input end of described second comparer are connected to the second end of described thermistor, another input end of described first comparer connects high level, another input end of described second comparer connects low level, described first comparer is connected logical circuit with the output terminal of described second comparer, and described logical 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 characterized in that, described temperature sensor is integral type structure, with described signal receiving module, described temperature computation block coupled in series after the parallel connection of multiple described temperature signal detection module.

10. according to the described temperature sensors of high precision being applied to Internet of Things arbitrary in claim 1-8, it is characterized in that, described temperature sensor is split-type structural, and described signal launches submodule and described signal receiving module transmits described temperature signal by wireless signal mode.