CN105424229A - Pressure detection apparatus for near infrared instrument and detection method thereof - Google Patents
Pressure detection apparatus for near infrared instrument and detection method thereof Download PDFInfo
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- CN105424229A CN105424229A CN201510824975.0A CN201510824975A CN105424229A CN 105424229 A CN105424229 A CN 105424229A CN 201510824975 A CN201510824975 A CN 201510824975A CN 105424229 A CN105424229 A CN 105424229A
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- pressure
- near infrared
- pressure transducer
- infrared spectrometer
- minimum system
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- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 11
- 230000003750 conditioning effect Effects 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000001228 spectrum Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 230000003595 spectral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004497 NIR spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/205—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using distributed sensing elements
-
- 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
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to the technical field of the detection instrument, especially to a pressure detection apparatus for a near infrared instrument and a detection method thereof. The pressure detection apparatus comprises a pressure sensor, a single-chip microcomputer minimum system, an A/D conversion unit and a display screen. The pressure sensor is arranged on a detection plane of a near infrared instrument and is used for detecting the pressure on a sample surface from the near infrared instrument; the A/D conversion unit connected between the pressure sensor and the single-chip microcomputer minimum system is used for converting the detection signal from the pressure sensor into a digital signal and transmitting the signal to the single-chip microcomputer minimum system for reading; the single-chip microcomputer minimum system carries out identification processing on the read digital signal; and the display screen connected with the single-chip microcomputer minimum system is used for displaying a processed digital signal. Therefore, a worker can carry out adjustment timely according a pressure parameter displayed on the display screen, thereby guaranteeing accuracy of sample spectrum information, realizing standardization of the measurement strength, and improving the precision of spectrum measurement.
Description
Technical field
The present invention relates to detecting instrument technical field, particularly relate to a kind of pressure-detecting device and the detection method thereof that are applicable near infrared spectrometer.
Background technology
The features such as near infrared spectroscopy has fast, harmless and multiple parameter is measured simultaneously, be widely used in the harmless detection of Modern Agricultural Food and other sample quality, the method utilizes detected object in the optical characteristics near infrared spectrum district, qualitative or Quantitative Analysis Model is set up by chemometrics method, make sample without the need to carrying out sample pretreatment, and multiple parameter can be realized measure the effect with short time measurement simultaneously.
Current hand-held near infrared spectrometer in use, often because to sample surfaces exert pressure inconsistent and sample surfaces each point discontinuity etc. cause the spectrum distortion of detected object, thus cause the testing result of detected object inaccurate.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention solves existing hand-held near infrared spectrometer to detect the inaccurate problem of testing result caused the difference of exerting pressure of sample.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of pressure-detecting device being applicable near infrared spectrometer, comprise pressure transducer, single-chip minimum system, A/D converting unit and display screen, described pressure transducer is located on the test surface of near infrared spectrometer, for detecting the pressure of the near infrared spectrometer that sample surfaces is subject to, described A/D converting unit is connected between pressure transducer and single-chip minimum system, the detection signal of described pressure transducer is converted to digital signal and passes to described single-chip minimum system and reads by described A/D converting unit, described single-chip minimum system carries out identifying processing to the described digital signal read, described display screen is connected with described single-chip minimum system, for the digital signal after Graphics Processing.
Wherein, also comprise power supply, described power supply is connected with described single-chip minimum system.
Wherein, also comprise signal conditioning circuit, described pressure transducer is connected by described signal conditioning circuit with described A/D converting unit.
Wherein, the quantity of described pressure transducer is multiple, and multiple described pressure transducer is uniformly distributed around the probe of near infrared spectrometer.
Wherein, the quantity of described pressure transducer is 4, and described signal conditioning circuit comprises 4 constant-current source circuits, and 4 described pressure transducers are connected with 4 described constant-current source circuits respectively.
Present invention also offers a kind of detection method being applicable to the pressure-detecting device of near infrared spectrometer, comprise step S1, multiple pressure transducer carries out signals collecting respectively;
S2, processes collection signal;
S3, the result after display screen Graphics Processing.
Wherein, described step S1 also comprises S11, system initialization, and the acquisition channel of one of them pressure transducer is opened;
S12, carries out signals collecting;
S13, whether the pressure transducer carrying out signals collecting in determining step S12 completes collection; If do not complete, return step S12, if complete, perform step S14;
S14, the acquisition channel of next pressure transducer is opened;
S15, judges the whether all settling signal collection of multiple pressure transducer; If do not complete, the acquisition channel opened at S14 returns step S12, if complete, performs step S2.
(3) beneficial effect
Technique scheme tool of the present invention has the following advantages: the pressure-detecting device being applicable near infrared spectrometer provided by the invention, pressure transducer is arranged in the detection faces of near infrared spectrometer, when near infrared spectrometer and sample carry out the spectral information of contact detection sample surfaces, pressure transducer detects the pressure of near infrared spectrometer to sample surfaces, and by signal processing circuit by the pressure signal transmission that detects to A/D converting unit, A/D converting unit is connected with single-chip minimum system, single-chip minimum system carries out process to pressure signal and finally shows on the display screen be connected with monolithic, staff can make according to the pressure parameter that display screen shows and adjusting timely, ensure the accuracy of sample spectra information, realize the standardization of measurement dynamics, improve the levels of precision of spectral measurement.
Accompanying drawing explanation
Fig. 1 is the structural representation being applicable to the pressure-detecting device of near infrared spectrometer provided by the invention;
Fig. 2 is the installation site figure of pressure transducer of the present invention;
Fig. 3 is the process flow diagram being applicable to the detection method of the pressure-detecting device of near infrared spectrometer of the present invention;
Fig. 4 is the process flow diagram being applicable to the detection method of the pressure-detecting device of near infrared spectrometer of the present invention.
In figure: 10: pressure transducer; 20:A/D converting unit; 30: single-chip minimum system; 40: display screen; 50: power supply; 5: probe; 101: pressure transducer; 102: pressure transducer; 103: pressure transducer; 104: pressure transducer.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
In describing the invention, it should be noted that, except as otherwise noted, the implication of " multiple " is two or more; Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, also it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, visual concrete condition understands above-mentioned term concrete meaning in the present invention.
As depicted in figs. 1 and 2, a kind of pressure-detecting device being applicable near infrared spectrometer that the embodiment of the present invention provides, comprise pressure transducer 10, single-chip minimum system 30, A/D converting unit 20, signal conditioning circuit and display screen 40, wherein single-chip minimum system 30 and A/D converting unit 20 are arranged on the inside of near infrared spectrometer, pressure transducer 10 is located on the test surface of near infrared spectrometer, the test surface of near infrared spectrometer is provided with probe 5, the quantity of pressure transducer 10 is N number of, N be greater than 1 positive integer, the surrounding that N number of pressure transducer 10 is arranged on probe 5 is uniformly distributed, when near infrared spectrometer works, pressure transducer 10 directly contacts with detection sample, induction near infrared spectrometer is to the pressure of sample surfaces, pressure transducer 10 is connected with A/D converting unit 20 by signal conditioning circuit, further, signal conditioning circuit comprises 4 constant-current source circuits, the quantity of pressure transducer 10 is 4, be respectively pressure transducer 101, pressure transducer 102, pressure transducer 103 and pressure transducer 104, 4 pressure transducers 10 are connected with 4 constant-current source circuits respectively, the current constant of constant-current source circuit, calibration formula with reference to pressure transducer 10:
Wherein, F is the force value that object is subject to, R
pfor the corresponding resistance value exported when sensor is subject to this pressure.By constant-current source circuit, by constant for the current value of flows through sensor, by voltage, electric current and resistance triadic relation formula:
U
out＝IR
p
Known, when electric current is identical, voltage is directly proportional to resistance value, therefore can change by A/D the magnitude of voltage collected and shift back current suffered force value formula onto:
Known, the magnitude of voltage that constant-current source circuit exports is directly proportional to the pressure of sample surfaces, thus carries out pressure survey.
A/D converting unit 20 is connected with single-chip minimum system 30, the analog signal voltage value that constant-current source circuit exports is converted to digital signal and passes to single-chip minimum system 30 and reads by A/D converting unit 20, single-chip minimum system 30 carries out identifying processing to the digital signal read, digital signal is converted to corresponding pressure parameter, pressure measuring value is obtained by least-squares refinement, the non-detection faces that display screen 40 is arranged near infrared spectrometer is connected with single-chip minimum system 30, for showing the pressure measuring value that pressure obtains, the content of display comprises pressure and the time of 4 pressure transducers 10 of current detection.
In addition, this device also comprises power supply 50, and power supply 50 is connected with single-chip minimum system 30, for single-chip minimum system 30 provides electric energy.
When near infrared spectrometer is measured sample spectra information, pressure transducer 10 contacts with sample surfaces, detect the pressure of the near infrared spectrometer that sample surfaces is subject to, 4 pressure transducers 10 are connected with A/D converting unit 20 respectively by 4 constant-current source circuits, the analog voltage signal that constant-current source circuit exports is converted into digital signal by programming by A/D converting unit 20, be input to single-chip minimum system 30, then carried out the process of pressure signal therein by software programming by single-chip minimum system 30, final display screen 40 demonstrates the pressure data of measurement and the time of measurement thereof.This pressure-detecting device being applicable near infrared spectrometer can monitor the pressure of near infrared spectrometer to sample surfaces in real time, user can adjust timely according to the data of display on display screen 40, ensure that the accuracy of sample spectra information, realize the standardization that it measures dynamics, improve the levels of precision of spectral measurement.
Present invention also offers a kind of detection method being applicable to the pressure-detecting device of near infrared spectrometer, digital quantity is converted in A/D converting unit 20 carry out the programming analog quantity of magnitude of voltage signal conditioning circuit being input to single-chip microcomputer, the inside of single-chip minimum system 30 is processed by the pressure data detected of software programming to pressure transducer 10, as shown in Figure 3, this detection method comprises step S1, and N number of pressure transducer 10 carries out signals collecting successively;
S2, carries out data processing to collection signal;
S3, the result after display screen 40 Graphics Processing.
Further, for N=4, as shown in Figure 4, step S1 also comprises step S11, first the acquisition channel of 4 pressure transducers 10 is numbered by 0-3 in software programming, system initialization, the acquisition channel of one of them pressure transducer 10 is opened, and the acquisition channel that system default is numbered the pressure transducer 10 of 0 is opened;
S12, carries out signals collecting;
S13, whether the pressure transducer 10 carrying out signals collecting in determining step S12 completes collection.If do not complete, return step S12, the acquisition channel being namely numbered the pressure transducer 10 of 0 proceeds signals collecting, if complete, performs step S14;
S14, the acquisition channel of next pressure transducer 10 is opened, and the acquisition channel being namely numbered the pressure transducer 10 of 1 opens preparation for acquiring signal;
S15, judge the whether all settling signal collection of 4 pressure transducers 10, in software programming, be embodied in the numbering judging current acquisition channel whether be greater than 3, prove all settling signal collections of 4 pressure transducers 10 when numbering is greater than 3, prove there is the non-settling signal collection of pressure transducer 10 when numbering is less than 3; If do not complete, the acquisition channel opened at S14 returns step S12, and namely the acquisition channel of the pressure transducer of current number proceeds signals collecting, if complete, then performs step S2.
In sum, the pressure-detecting device being applicable near infrared spectrometer provided by the invention makes user can the pressure of Real-Time Monitoring probe to sample surfaces, thus make and adjusting timely, ensure that the accuracy of sample spectra information, realize the standardization that it measures dynamics, improve the order of accuarcy of spectral measurement.The signal acquisition method being applicable to the pressure-detecting device of near infrared spectrometer provided by the invention achieves comprehensively measuring in real time sample surfaces pressure by 4 pressure transducers successively collection signal mode.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. one kind is applicable to the pressure-detecting device of near infrared spectrometer, it is characterized in that: comprise pressure transducer, single-chip minimum system, A/D converting unit and display screen, described pressure transducer is located on the test surface of near infrared spectrometer, for detecting the pressure of the near infrared spectrometer that sample surfaces is subject to, described A/D converting unit is connected between pressure transducer and single-chip minimum system, the detection signal of described pressure transducer is converted to digital signal and passes to described single-chip minimum system and reads by described A/D converting unit, described single-chip minimum system carries out identifying processing to the described digital signal read, described display screen is connected with described single-chip minimum system, for the digital signal after Graphics Processing.
2. the pressure-detecting device being applicable near infrared spectrometer according to claim 1, is characterized in that: also comprise power supply, and described power supply is connected with described single-chip minimum system.
3. the pressure-detecting device being applicable near infrared spectrometer according to claim 1, is characterized in that: also comprise signal conditioning circuit, and described pressure transducer is connected by described signal conditioning circuit with described A/D converting unit.
4. the pressure-detecting device being applicable near infrared spectrometer according to claim 3, is characterized in that: the quantity of described pressure transducer is multiple, and multiple described pressure transducer is uniformly distributed around the probe of near infrared spectrometer.
5. the pressure-detecting device being applicable near infrared spectrometer according to claim 4, it is characterized in that: the quantity of described pressure transducer is 4, described signal conditioning circuit comprises 4 constant-current source circuits, and 4 described pressure transducers are connected with 4 described constant-current source circuits respectively.
6. be applicable to a detection method for the pressure-detecting device of near infrared spectrometer as claimed in claim 4, it is characterized in that: comprise step S1, multiple pressure transducer carries out signals collecting successively;
S2, processes collection signal;
S3, the result after display screen Graphics Processing.
7. be applicable to a detection method for the pressure-detecting device of near infrared spectrometer as claimed in claim 6, it is characterized in that: described step S1 also comprises S11, system initialization, the acquisition channel of one of them pressure transducer is opened;
S12, carries out signals collecting;
S13, whether the pressure transducer carrying out signals collecting in determining step S12 completes collection, if do not complete, returns step S12, if complete, performs step S14;
S14, the acquisition channel of next pressure transducer is opened;
S15, judge the whether all settling signal collection of multiple pressure transducer, if do not complete, the acquisition channel opened at S14 returns step S12, if complete, performs step S2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510824975.0A CN105424229A (en) | 2015-11-24 | 2015-11-24 | Pressure detection apparatus for near infrared instrument and detection method thereof |
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| CN201510824975.0A CN105424229A (en) | 2015-11-24 | 2015-11-24 | Pressure detection apparatus for near infrared instrument and detection method thereof |
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| CN201510824975.0A Pending CN105424229A (en) | 2015-11-24 | 2015-11-24 | Pressure detection apparatus for near infrared instrument and detection method thereof |
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Cited By (2)
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| CN106813996A (en) * | 2017-03-20 | 2017-06-09 | 河北神州保温建材集团有限公司 | Detection means and rubber and plastic boards production system |
| CN108007636A (en) * | 2016-11-01 | 2018-05-08 | 神华集团有限责任公司 | Pressure gauge and the method for measuring pressure |
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| CN108007636A (en) * | 2016-11-01 | 2018-05-08 | 神华集团有限责任公司 | Pressure gauge and the method for measuring pressure |
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Application publication date: 20160323 |