CN111257273A - Coal quality analyzer and coal quality detection circuit thereof - Google Patents
Coal quality analyzer and coal quality detection circuit thereof Download PDFInfo
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- CN111257273A CN111257273A CN202010191664.6A CN202010191664A CN111257273A CN 111257273 A CN111257273 A CN 111257273A CN 202010191664 A CN202010191664 A CN 202010191664A CN 111257273 A CN111257273 A CN 111257273A
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- infrared detector
- coal quality
- analog
- cpu
- digital converter
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- 239000003245 coal Substances 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
Abstract
The invention discloses a coal quality analyzer and a coal quality detection circuit thereof, comprising: the infrared detector comprises a first infrared detector, a second infrared detector, a temperature sensor, an analog-to-digital converter, a CPU and a transceiver, wherein the first infrared detector, the second infrared detector and the temperature sensor are respectively connected with the analog-to-digital converter, the analog-to-digital converter is connected with the CPU, the transceiver is connected with the CPU, when the infrared detector works, the first infrared detector measures the peak value of a reference signal, the second infrared detector measures the peak value of a gas concentration signal, the signal is converted into a digital signal by acquiring a double-channel infrared detection signal and a compensation temperature signal, and then the signal is sent out by the CPU through the transceiver, so that the interference of external factors such as the ambient temperature, the gas temperature, gas impurities and the like on the infrared detector is eliminated, the detection stability is improved, in addition, the problem that the analog signal sensing is easily interfered is solved by directly uploading the digital.
Description
Technical Field
The invention relates to the technical field of coal quality analysis, in particular to a coal quality detection circuit for a coal quality analyzer.
Background
In the field of coal quality analysis, elemental components C, H, S and the like are main indexes of coal settlement, and the elemental components directly influence the actual price quoted for coal.
At present, the existing coal quality analyzer mainly measures by infrared spectroscopy, and the detection principle is as follows: when infrared light passes through a gas cell filled with a gas to be measured, the intensity of the light is reduced due to the infrared absorption characteristic of C, H or S elements in the gas, according to Lambert-beer' S law: the absorbance is in direct proportion to the concentration of the gas, and the percentage of the gas to be measured can be obtained quantitatively through the relational expression.
However, the existing infrared detector has the following problems: the single-path sensor is adopted to detect the gas concentration, and is easily influenced by carrier gas temperature, pressure, environment temperature, impurities and the like; the circuit stability is poor, and the problems of voltage drop and the like are easy to occur.
Therefore, how to provide a detection circuit of a coal quality analyzer with high detection stability is a technical problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
An object of the present invention is to provide a coal quality detection circuit, which can effectively solve the problems of poor stability of coal quality detection, etc., and another object of the present invention is to provide a coal quality detector including the above coal quality detection circuit.
In order to solve the technical problems, the invention provides the following technical scheme:
a coal quality detection circuit comprising:
the first infrared detector is used for measuring the peak value of the reference signal;
the second infrared detector is used for measuring the peak value of the gas concentration signal;
the temperature sensor is used for detecting the temperature of the gas to be detected;
the first infrared detector, the second infrared detector and the temperature sensor are respectively connected with the analog-to-digital converter, the analog-to-digital converter is connected with the CPU, the transceiver is connected with the CPU, and the CPU is used for processing data sent by the analog-to-digital converter and sending the data through the transceiver;
a common mode voltage connected to negative terminals of the first and second infrared detectors and the analog-to-digital converter.
Preferably, the temperature sensor is a PT100 sensor, and the PT100 sensor is connected to the analog-to-digital converter through a bridge and a discharge circuit.
Preferably, the temperature sensor is a thermistor, and the thermistor is connected with the analog-to-digital converter through an amplifying circuit.
Preferably, the infrared light source module further comprises a power chip and an infrared light source module, wherein the power chip is connected with the CPU and the infrared light source module.
Preferably, the system further comprises a temperature control circuit connected with the CPU.
A coal quality analyzer comprises the coal quality detection circuit.
Compared with the prior art, the technical scheme has the following advantages:
the invention provides a coal quality analyzer and a coal quality detection circuit thereof, comprising: the first infrared detector, the second infrared detector, the temperature sensor, the analog-digital converter, the CPU and the transceiver, the first infrared detector, the second infrared detector and the temperature sensor are respectively connected with the analog-digital converter, the analog-digital converter is connected with the CPU, the transceiver is connected with the CPU, when the infrared detector works, the first infrared detector measures the peak value of a reference signal, the second infrared detector measures the peak value of a gas concentration signal, a double-channel infrared detection signal can be obtained through the first infrared detector and the second infrared detector, a compensation temperature signal can be obtained, after the signal is converted into a digital signal, the signal is converted into a standard gas concentration signal through a serial port pin of the CPU, the standard gas concentration signal is transmitted through the transceiver, the interference of external factors such as environment temperature, gas impurities and the like to the infrared detectors is eliminated, and the detection stability is improved, in addition, the problem that the sensing of the analog signals is easily interfered is solved by directly uploading the digital signals.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a coal quality detection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1, fig. 1 is a schematic diagram of a coal quality detection circuit according to an embodiment of the present invention.
One embodiment of the present invention provides a coal quality detection circuit, including: the infrared detection device comprises a first infrared detector, a second infrared detector, a temperature sensor, an analog-to-digital converter, a CPU and a transceiver, wherein the first infrared detector, the second infrared detector and the temperature sensor are respectively connected with the analog-to-digital converter, the analog-to-digital converter is connected with the CPU, the transceiver is preferably an isolation RS485/RS232 module, interference of external signals to an infrared detection circuit is avoided, in addition, the transceiver is preferably an Ethernet interface, and data are uploaded through a network. In operation, the first infrared detector measures the peak value of the reference signal, the second infrared detector measures the peak value of the gas concentration signal, in order to distinguish two paths of signals, different optical filters are adopted at the front ends of the first infrared detector and the second infrared detector, the specific selection type of the optical filters can refer to the absorption spectrum of corresponding gas, in addition, after the coal powder is combusted in sufficient oxygen, the gas temperature generated by the coal powder with different heating values is different, the infrared detector detects the temperature by absorbing radiation, but can also make corresponding to the ambient temperature, so the temperature of the gas to be detected is detected by the temperature sensor, so as to avoid the interference of the ambient temperature to the infrared sensor, importantly, the coal quality detection circuit can obtain two paths of infrared detection signals by the first infrared detector and the second infrared detector, and can acquire the compensation temperature signal, convert this signal into digital signal after, through CPU's serial ports foot, convert standard gas concentration signal through the transceiver and send away can, eliminated external factors such as ambient temperature, gas temperature, gaseous impurity and to infrared detector's interference, and then improved the detection stability, the time of system drift correction can promote 2 ~ 3 times, in addition through directly uploading digital signal, solved analog signal sensing easily by the problem of interference.
Further, the infrared sensor further comprises a common mode voltage, the common mode voltage is connected with the negative terminals of the first infrared detector and the second infrared detector and the analog-to-digital converter, the analog-to-digital converter is provided with at least four input terminals and comprises three sensor signals and one reference voltage signal, and the analog-to-digital converter supports SPI or I2And the C bus and the CPU exchange data. For example, about 200 millivolts of the common mode voltage can ensure that the voltage of about 0.1V is always applied to the AD input end, and the interference of small signals below 0.1V can be avoided. In addition, the first infrared detector and the second infrared detector are connected with the analog-to-digital converter through the amplifying circuit, and the amplifying circuit is required to amplify about 200 times because the infrared detection signal is generally 0.1-10 millivolts.
Specifically, the temperature sensor is preferably a PT100 sensor, and the PT100 sensor is connected with the analog-digital converter through a bridge and a discharge circuit.
In addition, the temperature sensor can also be a thermistor, and the thermistor is connected with the analog-to-digital converter through the amplifying circuit.
Further, the infrared light source device also comprises a power supply chip and an infrared light source module, wherein the power supply chip is connected with the CPU and the infrared light source module, the CPU preferably selects the STM32F401, is responsible for collecting, filtering and calculating analog signals and sending out data according to a certain format, the power supply chip is controlled through IO or a PWM pin of the CPU, and the power supply chip can directly drive the infrared light source.
In addition, the infrared pool temperature control device also comprises a temperature control circuit connected with the CPU, and can control devices such as a relay and the like to realize the temperature control of the infrared pool.
The invention also provides a coal quality analyzer, which comprises the coal quality detection circuit provided by any one of the embodiments, and the beneficial effects of the coal quality analyzer can be obtained by referring to the embodiments, and are not described herein again.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A coal quality detection circuit, comprising:
the first infrared detector is used for measuring the peak value of the reference signal;
the second infrared detector is used for measuring the peak value of the gas concentration signal;
the temperature sensor is used for detecting the temperature of the gas to be detected;
the first infrared detector, the second infrared detector and the temperature sensor are respectively connected with the analog-to-digital converter, the analog-to-digital converter is connected with the CPU, the transceiver is connected with the CPU, and the CPU is used for processing data sent by the analog-to-digital converter and sending the data through the transceiver;
a common mode voltage connected to negative terminals of the first and second infrared detectors and the analog-to-digital converter.
2. The coal quality detection circuit of claim 1, wherein the temperature sensor is a PT100 sensor, and the PT100 sensor is connected to the analog-to-digital converter through a bridge and discharge circuit.
3. The coal quality detection circuit of claim 1, wherein the temperature sensor is a thermistor, and the thermistor is connected to the analog-to-digital converter through an amplification circuit.
4. The coal quality detection circuit according to any one of claims 1 to 3, further comprising a power chip and an infrared light source module, wherein the power chip is connected to the CPU and the infrared light source module.
5. The coal quality detection circuit of claim 4 further comprising a temperature control circuit connected to the CPU.
6. A coal quality analyzer comprising the coal quality detection circuit according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010191664.6A CN111257273A (en) | 2020-03-18 | 2020-03-18 | Coal quality analyzer and coal quality detection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010191664.6A CN111257273A (en) | 2020-03-18 | 2020-03-18 | Coal quality analyzer and coal quality detection circuit thereof |
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| Publication Number | Publication Date |
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| CN111257273A true CN111257273A (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010191664.6A Pending CN111257273A (en) | 2020-03-18 | 2020-03-18 | Coal quality analyzer and coal quality detection circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115452757A (en) * | 2022-11-11 | 2022-12-09 | 电子科技大学 | CO based on sensor 2 Concentration monitoring system |
-
2020
- 2020-03-18 CN CN202010191664.6A patent/CN111257273A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115452757A (en) * | 2022-11-11 | 2022-12-09 | 电子科技大学 | CO based on sensor 2 Concentration monitoring system |
| CN115452757B (en) * | 2022-11-11 | 2023-02-14 | 电子科技大学 | CO based on sensor 2 Concentration monitoring system |
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