CN212748068U - Thermal imaging based data analyzer - Google Patents
Thermal imaging based data analyzer Download PDFInfo
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- CN212748068U CN212748068U CN202021299406.1U CN202021299406U CN212748068U CN 212748068 U CN212748068 U CN 212748068U CN 202021299406 U CN202021299406 U CN 202021299406U CN 212748068 U CN212748068 U CN 212748068U
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Abstract
The utility model relates to a thermal imaging technology field discloses a better thermal imaging data analyzer based on data processing performance, possesses: the operational amplifier is configured in the thermal imaging data analyzer and used for receiving the pyroelectric signal output by the infrared sensor and amplifying the pyroelectric signal; the signal input end of the analog-to-digital converter is connected with the output end of the operational amplifier and is used for receiving the pyroelectric signal and carrying out noise reduction processing on the pyroelectric signal; and the signal input end of the digital isolator is coupled with the signal output end of the analog-to-digital converter and used for receiving the pyroelectric signal subjected to noise reduction processing and carrying out modeling analysis according to the pyroelectric signal.
Description
Technical Field
The utility model relates to a thermal imaging technology field, more specifically say, relate to a based on thermal imaging data analyzer.
Background
Thermal infrared imaging images an object by being sensitive to thermal infrared, and further reflects the temperature field of the surface of a monitored target. At present, when an infrared heat sensor is used for acquiring temperature parameters and then a post-stage circuit is used for analysis, the accuracy of the temperature parameters output by the post-stage circuit is low due to the fact that the external environment greatly interferes with the infrared heat sensor.
Therefore, how to improve the accuracy of the output temperature parameter becomes a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, the above-mentioned external environment to prior art is great to infrared heat sensor's interference, leads to the not high defect of accuracy of the temperature parameter of back stage circuit output, provides a better thermal imaging data analyzer based on of data processing performance.
The utility model provides a technical scheme that its technical problem adopted is: a thermal imaging-based data analyzer is configured to include:
the operational amplifier is configured in the thermal imaging data analyzer and used for receiving the pyroelectric signal output by the infrared sensor and amplifying the pyroelectric signal;
the signal input end of the analog-to-digital converter is connected with the output end of the operational amplifier and is used for receiving the pyroelectric signal and carrying out noise reduction processing on the pyroelectric signal;
and the signal input end of the digital isolator is coupled with the signal output end of the analog-to-digital converter and used for receiving the pyroelectric signal subjected to noise reduction processing and carrying out modeling analysis according to the pyroelectric signal.
In some embodiments, the operational amplifier comprises a first operational amplifier and a second operational amplifier,
the inverting end of the first operational amplifier is connected with a signal output end of the infrared sensor;
the output end of the first operational amplifier is coupled to a signal input end of the analog-to-digital converter;
the inverting end of the second operational amplifier is connected with the other signal output end of the infrared sensor;
the output end of the second operational amplifier is coupled to the other signal input end of the analog-to-digital converter.
In some embodiments, the device further comprises a first resistor, a second resistor, a third resistor and a first capacitor, wherein the third resistor is connected in parallel with the first capacitor;
one end of the first resistor is connected with a signal output end of the infrared sensor, and the other end of the first resistor is coupled to an inverting end of the first operational amplifier;
one end of the second resistor is connected with the in-phase end of the first operational amplifier, and the other end of the second resistor is coupled to the other end of the analog-to-digital converter;
the third resistor is connected with one end of the first capacitor and the inverting end of the first operational amplifier,
the third resistor is connected with the other end of the first capacitor and the output end of the first operational amplifier.
In some embodiments, the device further comprises a sixth resistor, a seventh resistor, an eighth resistor and a third capacitor, wherein the eighth resistor is connected in parallel with the third capacitor;
one end of the sixth resistor is connected with the other signal output end of the infrared sensor, and the other end of the sixth resistor is coupled to the inverting end of the second operational amplifier;
one end of the seventh resistor is connected with the in-phase end of the second operational amplifier, and the other end of the seventh resistor is coupled to the other end of the analog-to-digital converter;
one end of the eighth resistor and one end of the third capacitor are connected with the inverting end of the second operational amplifier,
and the other end of the eighth resistor and the third capacitor is connected with the output end of the second operational amplifier.
In some embodiments, the device further comprises an amplifier, wherein the non-inverting terminal of the amplifier is connected with an output terminal of the analog-to-digital converter,
the output end of the amplifier is coupled to the non-inverting end of the operational amplifier.
In the thermal imaging-based data analyzer of the present invention, include: the operational amplifier is used for receiving the pyroelectric signals output by the infrared sensor and amplifying the pyroelectric signals, the analog-to-digital converter is used for receiving the pyroelectric signals and carrying out noise reduction processing on the pyroelectric signals, and the digital isolator is used for receiving the pyroelectric signals subjected to noise reduction processing and carrying out modeling analysis according to the pyroelectric signals. Compared with the prior art, the pyroelectric signal is clustered and classified through the digital isolator, effective data are analyzed, so that the accuracy and the integrity of the data are improved, and the problem that the accuracy of output temperature parameters is low due to the fact that the external environment interferes with the infrared thermal sensor can be effectively solved.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
figure 1 is a circuit diagram of an embodiment of a thermal imaging based data analyzer,
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in the first embodiment of the thermal imaging data analyzer of the present invention, the thermal imaging data analyzer includes a data analyzing circuit 100 for processing a pyroelectric signal, wherein the data analyzing circuit 100 includes an operational amplifier (corresponding to U1A and U1B), an analog-to-digital converter U101, and a digital isolator U102.
The operational amplifiers (corresponding to U1A and U1B) are four-channel rail-to-rail input and output CMOS amplifiers. The operational amplifier may level convert and gain the incoming weak signal to match the input range of the ADC.
The analog-to-digital converter U101 is an 8-channel low-crosstalk multiplexer, a low-drift reference voltage source, and a channel sequencer.
The digital isolator U102 is used to define and analyze the requirements of the data and the information it needs to support accordingly to ensure the accuracy and integrity of the data.
Specifically, the operational amplifier (corresponding to U1A and U1B) is disposed in the thermal imaging data analyzer, and is configured to receive the pyroelectric signal output by the infrared sensor (corresponding to the signal output terminal of CH 0-CH 7 in the figure), gain and amplify the pyroelectric signal, and then output the pyroelectric signal to the analog-to-digital converter U101.
The signal input end (corresponding to AI 0-AI 7) of the analog-to-digital converter U101 is connected to the output end of the operational amplifier (corresponding to U1A and U1B), and is configured to receive the gain and amplified pyroelectric signal, perform noise reduction on the pyroelectric signal, convert the pyroelectric signal (analog signal) into a digital signal, and output the processed pyroelectric signal to the digital isolator U102.
The signal input ends (corresponding to the ends V0A, V0B and V0C) of the digital isolator U102 are respectively connected with the signal output ends (corresponding to the ends SCK, DIN and CNV) of the analog-to-digital converter U101, and the digital isolator U102 is used for receiving the noise-reduced pyroelectric signals and performing modeling analysis according to the pyroelectric signals.
Specifically, the infrared sensor inputs the collected pyroelectric signals into an operational amplifier (corresponding to U1A and U1B) through a CH 0-CH 7 signal end, the pyroelectric signals are input into a digital isolator U102 after amplification and analog-to-digital conversion, the digital isolator U102 performs screening, definition and data analysis on the pyroelectric signals, and the two-dimensional shape of the pyroelectric signals is determined through analyzed effective parameters so as to ensure the integrity and accuracy of the pyroelectric signals.
In some embodiments, to improve the gain effect of the pyroelectric signal, operational amplifiers may be provided as the first operational amplifier U1A and the second operational amplifier U1B, wherein having low current and voltage noise may ensure that the resistance noise is a high input impedance output noise.
Specifically, the inverting terminal (corresponding to pin 3) of the first operational amplifier U1A is connected to a signal output terminal (corresponding to terminal CH 0) of an infrared sensor (not shown in the figure), and the output terminal (corresponding to pin 4) of the first operational amplifier U1A is connected to a signal input terminal (corresponding to terminal AI 0) of the analog-to-digital converter U101, that is, the pyroelectric signal of the target obtained by the infrared sensor is gain-amplified by the first operational amplifier U1A and then input to the analog-to-digital converter U101, so as to reduce the crosstalk of the external signal.
The inverting terminal (corresponding to 6 pins) of the second operational amplifier U1B is connected to another signal output terminal (corresponding to 6 pins) of the infrared sensor, and the output terminal (corresponding to 8 pins) of the second operational amplifier U1B is connected to another signal input terminal (corresponding to AI7 terminal) of the analog-to-digital converter U101, that is, the target pyroelectric signal obtained by the infrared sensor is gain-amplified by the second operational amplifier U1B and then input to the analog-to-digital converter U101, so as to reduce crosstalk of external signals.
In some embodiments, in order to improve the performance of the circuit, a first resistor R101, a second resistor R102, a third resistor R103, and a first capacitor C101 may be disposed in the data analysis circuit 100, wherein the resistances of the first resistor R101 and the second resistor R102 may be selected to be 49.5K Ω, the resistance of the third resistor R103 may be selected to be 10K Ω, and the capacitance of the first capacitor C101 may be selected to be 8.2 pF.
Specifically, the third resistor R103 is connected in parallel with the first capacitor C101, which is a feedback circuit.
One end of the first resistor R101 is connected to a signal output end (corresponding to the CH0 end) of the infrared sensor, the other end of the first resistor R101 is coupled to the inverting terminal (corresponding to the 3-pin) of the first operational amplifier U1A, one end of the second resistor R102 is connected to the non-inverting terminal (corresponding to the 2-pin) of the first operational amplifier U1A, and the other end of the second resistor R102 is coupled to the other end (corresponding to the ADC) of the analog-to-digital converter U101.
One end of the third resistor R103 and the first capacitor C101 is connected to the inverting terminal (corresponding to pin 3) of the first operational amplifier U1A, and the other end of the third resistor R103 and the first capacitor C101 is connected to the output terminal (corresponding to pin 4) of the first operational amplifier U1A.
That is, the pyroelectric signal output by the infrared sensor is input to the first operational amplifier U1A through the first resistor R101, gain-amplified by the first operational amplifier U1A, and the output pyroelectric signal is fed back to the first operational amplifier U1A through the third resistor R103 and the first capacitor C101, and gain-amplified again.
In some embodiments, in order to improve the performance of the circuit, a sixth resistor R106, a seventh resistor R107, an eighth resistor R108, and a third capacitor C103 may be disposed in the data analysis circuit 100, wherein the eighth resistor R108 and the third capacitor C103 are connected in parallel to form a feedback circuit.
Specifically, one end of the sixth resistor R106 is connected to another signal output end (the end CH 7) of the infrared sensor, and the other end of the sixth resistor R106 is coupled to the inverting end (corresponding to pin 6) of the second operational amplifier U1B.
One end of the seventh resistor R107 is connected to the non-inverting terminal (corresponding to pin 7) of the second operational amplifier U1B, and the other end of the seventh resistor R107 is coupled to the other end (corresponding to terminal AI7) of the analog-to-digital converter U101.
One end of the eighth resistor R108 and one end of the third capacitor C103 are connected to the inverting terminal (corresponding to 6 pins) of the second operational amplifier U1B, and the other end of the eighth resistor R108 and the other end of the third capacitor C103 are connected to the output terminal (corresponding to 8 pins) of the second operational amplifier U1B.
That is, the pyroelectric signal output by the infrared sensor is input to the second operational amplifier U1B through the sixth resistor R106, gain-amplified by the second operational amplifier U1B, and the output pyroelectric signal is fed back to the second operational amplifier U1B through the eighth resistor R108 and the third capacitor C103, and gain-amplified again.
In some embodiments, to improve the reliability of the operation of the data analysis circuit 100, an amplifier U1C may be provided in the circuit, wherein the amplifier U1C serves as an external reference voltage buffer to provide sufficient driving capability for level shifting.
Specifically, the non-inverting terminal (corresponding to pin 11) of the amplifier U1C is connected to an output terminal (corresponding to ADC) of the ADC U101, and the output terminal of the amplifier U1C is connected to the non-inverting terminals of the operational amplifiers (corresponding to U1A and U1B).
More specifically, the output of the amplifier U1C is connected to the non-inverting terminal (corresponding to pin 2) of the first operational amplifier U1A, and the output of the amplifier U1C is connected to the non-inverting terminal (corresponding to pin 7) of the second operational amplifier U1B.
In some embodiments, the apparatus further includes a fifth resistor R105 and a tenth resistor R110, wherein one end of the fifth resistor R105 is connected to the output terminal (corresponding to 4 pins) of the first operational amplifier U1A, the other end of the fifth resistor R105 is connected to an input terminal (corresponding to AI0 terminal) of the analog-to-digital converter U101, and the pyroelectric signal output by the first operational amplifier U1A is input to the analog-to-digital converter U101 through the fifth resistor R105.
One end of the tenth resistor R110 is connected to the output end (corresponding to 8 pins) of the second operational amplifier U1B, the other end of the tenth resistor R110 is connected to the other input end (corresponding to AI7 end) of the analog-to-digital converter U101, and the pyroelectric signal output by the second operational amplifier U1B is input to the analog-to-digital converter U101 through the tenth resistor R110.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (5)
1. A thermal imaging-based data analyzer, comprising:
the operational amplifier is configured in the thermal imaging data analyzer and used for receiving the pyroelectric signal output by the infrared sensor and amplifying the pyroelectric signal;
the signal input end of the analog-to-digital converter is connected with the output end of the operational amplifier and is used for receiving the pyroelectric signal and carrying out noise reduction processing on the pyroelectric signal;
and the signal input end of the digital isolator is coupled with the signal output end of the analog-to-digital converter and used for receiving the pyroelectric signal subjected to noise reduction processing and carrying out modeling analysis according to the pyroelectric signal.
2. The thermal imaging data based analyzer of claim 1,
the operational amplifier comprises a first operational amplifier and a second operational amplifier,
the inverting end of the first operational amplifier is connected with a signal output end of the infrared sensor;
the output end of the first operational amplifier is coupled to a signal input end of the analog-to-digital converter;
the inverting end of the second operational amplifier is connected with the other signal output end of the infrared sensor;
the output end of the second operational amplifier is coupled to the other signal input end of the analog-to-digital converter.
3. The thermal imaging-based data analyzer of claim 2,
the circuit also comprises a first resistor, a second resistor, a third resistor and a first capacitor, wherein the third resistor is connected with the first capacitor in parallel;
one end of the first resistor is connected with a signal output end of the infrared sensor, and the other end of the first resistor is coupled to an inverting end of the first operational amplifier;
one end of the second resistor is connected with the in-phase end of the first operational amplifier, and the other end of the second resistor is coupled to the other end of the analog-to-digital converter;
the third resistor is connected with one end of the first capacitor and the inverting end of the first operational amplifier,
the third resistor is connected with the other end of the first capacitor and the output end of the first operational amplifier.
4. The thermal imaging-based data analyzer of claim 2,
the circuit also comprises a sixth resistor, a seventh resistor, an eighth resistor and a third capacitor, wherein the eighth resistor and the third capacitor are connected in parallel;
one end of the sixth resistor is connected with the other signal output end of the infrared sensor, and the other end of the sixth resistor is coupled to the inverting end of the second operational amplifier;
one end of the seventh resistor is connected with the in-phase end of the second operational amplifier, and the other end of the seventh resistor is coupled to the other end of the analog-to-digital converter;
one end of the eighth resistor and one end of the third capacitor are connected with the inverting end of the second operational amplifier,
and the other end of the eighth resistor and the third capacitor is connected with the output end of the second operational amplifier.
5. The thermal imaging data based analyzer of claim 1,
the non-inverting terminal of the amplifier is connected with one output terminal of the analog-to-digital converter,
the output end of the amplifier is coupled to the non-inverting end of the operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021299406.1U CN212748068U (en) | 2020-07-06 | 2020-07-06 | Thermal imaging based data analyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021299406.1U CN212748068U (en) | 2020-07-06 | 2020-07-06 | Thermal imaging based data analyzer |
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| Publication Number | Publication Date |
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| CN212748068U true CN212748068U (en) | 2021-03-19 |
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| CN202021299406.1U Active CN212748068U (en) | 2020-07-06 | 2020-07-06 | Thermal imaging based data analyzer |
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| CN (1) | CN212748068U (en) |
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