CN108303392A - A kind of infrared moisture meter and spectra collection method - Google Patents
A kind of infrared moisture meter and spectra collection method Download PDFInfo
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- CN108303392A CN108303392A CN201810010471.9A CN201810010471A CN108303392A CN 108303392 A CN108303392 A CN 108303392A CN 201810010471 A CN201810010471 A CN 201810010471A CN 108303392 A CN108303392 A CN 108303392A
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- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000010358 mechanical oscillation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
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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
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
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Abstract
The present invention relates to a kind of infrared moisture meter and spectra collection methods, infrared moisture meter may include infrared transmitter, Amici prism, Digital Micromirror Device DMD, infrared detector, control panel and display device, infrared transmitter is for emitting infrared light, Amici prism is used to the infrared light that testee reflects being divided into spectrum, spectrum is distributed in the way of row on each micro mirror of Digital Micromirror Device DMD, infrared detector is for being converted into electric signal by the spectrum emitted from micro mirror and being sent to control panel, the respective micromirrors that control panel is used to control DMD according to default DMD die plate patterns overturn to realize the selection of required spectrum and be acquired to the electric signal received from infrared detector, it handles and result is sent to display device and show.The present invention reduces electromagnetic interference and mechanical oscillation, to improve measurement accuracy by using DMD；In addition, the wavelength and quantity of selection spectrum can be adjusted flexibly by downloading DMD die plate patterns in the present invention, it is very easy to use.
Description
Technical field
The present invention relates to infrared moisture meters, more particularly to a kind of infrared moisture meter and spectra collection method.
Background technology
Infrared moisture meter is the instrument for detecting substance moisture, the application in each field such as tobacco, grain, chemical industry
Widely.Its detection principle is that have stronger absorption energy to the infrared light of specific wavelength based on the hydrone in object under test
Power, and other ingredients have few absorption, the object that can be thus detected according to infrared detector anti-this wavelength
It penetrates infrared energy size and calculates moisture in object.
Infrared moisture meter needs to acquire multiple optics spectral coverages, it is common practice to be divided using spectrometer, then into
Row acquisition.Current spectra collection method acquires spectroscopic data mainly in such a way that motor drives filter wheel, exists
Main problem be：1, motor operation can introduce electromagnetic interference in electronic system；2, motor operation can cause system vibration,
Influence acquisition precision；3, the rotating speed of motor acquires 3 or so band signals in 6000rpm or so (100Hz), one circle of rotation,
300 data of acquisition in one second, speed are difficult to improve speed again；4, the selection flexibility of spectrum is not high, once selected optical filter,
Its quantity and wave band are difficult to change.
Invention content
The present invention is intended to provide a kind of infrared moisture meter and spectra collection method, to solve above-mentioned existing Moisture Meter using electricity
Machine add drive filter wheel mode there are the problem of.For this purpose, the specific technical solution that the present invention uses is as follows：
A kind of infrared moisture meter, the infrared moisture meter may include infrared transmitter, Amici prism, Digital Micromirror Device
DMD, infrared detector, control panel and display device, for emitting infrared light, the Amici prism is used for the infrared transmitter
The infrared light that testee reflects is divided into spectrum, spectrum is distributed in each of the Digital Micromirror Device DMD in the way of row
On micro mirror, the infrared detector is for being converted into electric signal by the spectrum emitted from micro mirror and being sent to the control panel, institute
Control panel is stated for controlling the respective micromirrors overturning of the DMD according to default DMD die plate patterns to realize the selection of required spectrum
And the electric signal received from the infrared detector is acquired, is handled and result is sent to display device and is shown
Show.
Further, the micro mirror of the DMD is distributed as 1024*768.
Further, the control panel further includes USB interface, and the USB interface is used for peripheral hardware into row data communication.
Further, described to be set as PC machine outside.
Further, the control panel uses the structure of FPGA+DSP.
A kind of spectra collection method of infrared moisture meter as described above, the spectra collection method include the following steps：
The infrared light of infrared transmitter transmitting enters Amici prism after testee reflects, and is divided into difference by Amici prism
The spectrum of wavelength, spectrum are distributed in the way of row on each micro mirror of DMD, and the control panel is according to default DMD die plate patterns
Corresponding micro mirror overturning is controlled to realize that the selection of required spectrum, selected spectrum timesharing enter infrared detector and converted
At electric signal, finally it is acquired by the control panel.
Further, the spectra collection method further includes the steps that eliminating bias light, and detailed process is：First by DMD
In some wave band micro mirror standard-sized sheet so that all light of the wave band fully enter infrared detector, collected data at this time
For the superposition B+R of bias light B and effective light R；Then the micro mirror of the wave band is uniformly closed into half, collected data are at this time
The superposition B+R/2 of bias light B and effective light R/2；Collected data it will subtract each other twice, that obtain is R/2, is obtained multiplied by with 2
The final numerical value R for eliminating bias light, wherein the opening time of micro mirror is the same when acquiring twice.By eliminating bias light, Neng Gouti
The measurement accuracy of high IR Moisture Meter.
Further, the spectra collection method further includes that the toggle frequency of the micro mirror of the DMD is set as 600 hertz
The step of.
Further, the spectra collection method further includes the steps that DMD die plate patterns are preset in update, and detailed process is：
New DMD die plate patterns are sent to control panel by usb bus by peripheral hardware, are then written in DMD by control panel to cover
Original default DMD die plate patterns.
The present invention uses above-mentioned technical proposal, has an advantageous effect in that：It is dry to reduce electromagnetism by using DMD by the present invention
It disturbs and mechanical oscillation, to improve measurement accuracy；In addition, choosing can be adjusted flexibly by downloading DMD die plate patterns in the present invention
The wavelength and quantity of spectrum are selected, it is very easy to use.
Description of the drawings
Fig. 1 is the structural schematic diagram of infrared moisture meter according to the ... of the embodiment of the present invention；
Fig. 2 is the schematic diagram of the spectra collection method of infrared moisture meter according to the ... of the embodiment of the present invention；
Fig. 3 is the schematic diagram of distribution of the spectrum on the surfaces DMD；
Fig. 4 is DMD optical electivity schematic diagrames.
Specific implementation mode
To further illustrate that each embodiment, the present invention are provided with attached drawing.These attached drawings are that the invention discloses one of content
Point, mainly to illustrate embodiment, and the associated description of specification can be coordinated to explain the operation principles of embodiment.Cooperation ginseng
These contents are examined, those of ordinary skill in the art will be understood that other possible embodiments and advantages of the present invention.In figure
Component be not necessarily to scale, and similar component symbol is conventionally used to indicate similar component.
In conjunction with the drawings and specific embodiments, the present invention is further described.Fig. 1 is shown according to embodiments of the present invention
Infrared moisture meter 1.Infrared moisture meter 1 may include infrared transmitter 10, Amici prism 20, Digital Micromirror Device DMD 30, red
External detector 40, control panel 50 and display device 60.Infrared transmitter 10 is this field for emitting infrared light, concrete structure
Known to technical staff, it is not described further herein.Amici prism 20 is used to the infrared light that testee reflects being divided into light
Spectrum, spectrum are distributed in the way of row on each micro mirror of DMD30.Wherein, the micro mirror of DMD 30 is distributed as 1024*768.When
So, the micro mirror distribution of DMD 30 is without being limited thereto.Infrared detector 40 is used to the spectrum reflected from micro mirror being converted into electric signal simultaneously
It is sent to control panel 50.Control panel 50 is used to control the corresponding micro- of the Digital Micromirror Device DMD according to default DMD die plate patterns
Mirror overturns to realize the selection of required spectrum and be acquired the electric signal received from infrared detector 40, handle and and incite somebody to action
As a result display device 60 is sent to be shown.Wherein, control panel uses the structure of FPGA+DSP, this has played FPGA flexibilities
Strong and fast dsp chip arithmetic speed advantage, compensates for that conventional aqueous instrument operational precision is low, slow-footed disadvantage, improves simultaneously
The stability of system.In addition, control panel 50 may also include USB interface, the USB interface is for the peripheral hardware with PC machine etc.
Into row data communication.For example, the DMD die plate patterns of selection spectrum can be sent to control panel 50 by PC machine by usb bus.It is infrared
The tool of transmitter 10, Amici prism 20, Digital Micromirror Device DMD 30, infrared detector 40, control panel 50 and display device 60
Body structure is well known to those skilled in the art, and is not described further herein.It should be understood that using DMD to collecting part
It optimizes and improves, need to carry out corresponding design, including optics, structure and electronics etc. to whole system, be one whole
The optimization design of body is not simply to replace.
Referring now to Fig. 2-4, the spectra collection method of the infrared moisture meter of the present invention is described.Fig. 2 shows infrared moisture meters
Spectra collection method schematic diagram.Wherein, DMD plays the role of optical electivity.The infrared light of infrared transmitter transmitting passes through
Enter Amici prism after testee reflection, the infrared light after testee reflection becomes to have after the light splitting of Amici prism
The spectrum of different wave length.Each section of spectrum is distributed in the surfaces DMD, such as Fig. 3 in the way of row.Control panel is according to default DMD Prototype drawings
Respective micromirrors in case control DMD overturn to realize optical electivity.Specifically, when we need the infrared light of selection specific wavelength
Time spectrum, it is only necessary to which the micro mirror for controlling DMD corresponding positions is fully open (being turned to+12 degree), and other micro mirrors are closed (overturning
To -12 degree), so that it may on the spectral reflectance to infrared detector for needing selection, as shown in Figure 4.Selected spectrum timesharing
Into infrared detector and it is converted into electric signal, is finally acquired by control panel.Since DMD belongs to mems
System, therefore its overturning will not bring vibration problem.
It near infrared light detection process, has more or less bias light and enters infrared detector, give infrared detector
It brings greater impact, and reduces the dynamic range of detecting system.If acquiring N number of wave band, the bias light of each wave band
Size be not quite similar, so need elimination background is carried out to each wave band.
It is eliminated by the way that the double sampled realization bias light of micro mirror is arranged.It is implemented as：First by the micro- of some wave band in DMD
Mirror standard-sized sheet, so that all light of the wave band fully enter infrared detector, collected data are bias light B and effective light at this time
The superposition B+R of R；Then the micro mirror of the wave band is uniformly closed into half, collected data are bias light B and effective light R/ at this time
2 superposition B+R/2；Collected data it will subtract each other twice, that obtain is R/2, multiplied by the number for obtaining finally eliminating bias light with 2
Value R.In order to which the bias light acquired twice is constant, the opening time of micro mirror must be the same twice.
Spectra collection method may also include the step of DMD die plate patterns are preset in update, and detailed process is：By new DMD moulds
Plate pattern is sent to control panel by such as PC machine by usb bus, is then written in DMD by control panel original pre- to cover
If DMD die plate patterns.This pattern can be easy to modification die plate pattern content, to reach selection specific wavelength spectrum and
The purpose of spectrum quantity.
The highest toggle frequency of DMD is 20000Hz, by the acquisition of 4 wave bands plus a reference, acquires the time of a data most
It is 200us soon.If overturning is too fast, micro mirror residence time is too short, and the time for acquiring a spectroscopic data is too short, and energy is insufficient.
Consider energy and picking rate, sets the toggle frequency of DMD to 600Hz.
After DMD, selected spectral wavelength can be flexibly adjusted very much, and is not limited solely to several fixed waves
The quantity of long and selected wavelength need to only modify to back-end algorithm, you can apply the spectrum analysis in heterogeneity in this way
In.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
In vain, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (9)
1. a kind of infrared moisture meter, which is characterized in that the infrared moisture meter include infrared transmitter, Amici prism, number it is micro-
Mirror device DMD, infrared detector, control panel and display device, the infrared transmitter is for emitting infrared light, the light splitting rib
Mirror is used to the infrared light that testee reflects being divided into spectrum, and spectrum is distributed in the way of row on each micro mirror of the DMD,
The infrared detector is for being converted into electric signal by the spectrum reflected from micro mirror and being sent to the control panel, the control panel
Respective micromirrors for controlling the DMD according to default DMD die plate patterns overturn the selection to realize required spectrum and to from institutes
It states the electric signal that infrared detector receives and is acquired, handles and result is sent to display device and show.
2. infrared moisture meter as described in claim 1, which is characterized in that the micro mirror of the Digital Micromirror Device DMD is distributed as
1024*768。
3. the spectra collection method of infrared moisture meter as described in claim 1, which is characterized in that the control panel further includes
USB interface, the USB interface are used for peripheral hardware into row data communication.
4. the spectra collection method of infrared moisture meter as claimed in claim 3, which is characterized in that be set as PC machine outside described.
5. the spectra collection method of infrared moisture meter as described in claim 1, which is characterized in that the control panel uses FPGA
The structure of+DSP.
6. a kind of spectra collection method of infrared moisture meter as described in any one of the claims 1-5, feature exist
In the spectra collection method includes the following steps：The infrared light of infrared transmitter transmitting enters after testee reflects
Amici prism is divided into the spectrum with different wave length by Amici prism, and spectrum is distributed in each micro mirror of DMD in the way of row
On, the control panel according to default DMD die plate patterns controls the overturning of corresponding micro mirror to realize the selection of required spectrum, selected
Spectrum timesharing enter infrared detector and be converted into electric signal, be finally acquired by the control panel.
7. the spectra collection method of infrared moisture meter as claimed in claim 6, which is characterized in that the spectra collection method is also
Include the steps that eliminating bias light, detailed process is：First by the micro mirror standard-sized sheet of some wave band in DMD, so that the wave band
All light fully enter infrared detector, and collected data are the superposition B+R of bias light B and effective light R at this time；Then should
The micro mirror of wave band uniformly closes half, and collected data are the superposition B+R/2 of bias light B and effective light R/2 at this time；It will twice
Collected data are subtracted each other, and that obtain is R/2, multiplied by the numerical value R for obtaining finally eliminating bias light with 2, wherein when acquiring twice
The opening time of micro mirror is the same.
8. the spectra collection method of infrared moisture meter as claimed in claim 6, which is characterized in that the spectra collection method is also
Include the steps that the toggle frequency of the micro mirror of the DMD is set as 600 hertz.
9. the spectra collection method of infrared moisture meter as claimed in claim 6, which is characterized in that the spectra collection method is also
Include the steps that DMD die plate patterns are preset in update, detailed process is：New DMD die plate patterns are sent out by peripheral hardware by usb bus
Control panel is given, is then written in DMD by control panel to cover original default DMD die plate patterns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810010471.9A CN108303392A (en) | 2018-01-05 | 2018-01-05 | A kind of infrared moisture meter and spectra collection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810010471.9A CN108303392A (en) | 2018-01-05 | 2018-01-05 | A kind of infrared moisture meter and spectra collection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487740A (en) * | 2019-07-02 | 2019-11-22 | 西安理工大学 | Unginned cotton regain on-line measurement system and its measurement method based on Near-Infrared Absorption Method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5504575A (en) * | 1991-12-20 | 1996-04-02 | Texas Instruments Incorporated | SLM spectrometer |
| CN103649677A (en) * | 2011-07-13 | 2014-03-19 | 法罗技术股份有限公司 | Device and method using a spatial light modulator to find 3D coordinates of an object |
| CN104897082A (en) * | 2015-06-08 | 2015-09-09 | 华东师范大学 | High-speed structured light generating and processing device based on intelligent mobile platform |
| CN107167929A (en) * | 2017-06-12 | 2017-09-15 | 华南师范大学 | Double mode optical ultra-discrimination microscopic imaging device and method based on DMD |
-
2018
- 2018-01-05 CN CN201810010471.9A patent/CN108303392A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5504575A (en) * | 1991-12-20 | 1996-04-02 | Texas Instruments Incorporated | SLM spectrometer |
| CN103649677A (en) * | 2011-07-13 | 2014-03-19 | 法罗技术股份有限公司 | Device and method using a spatial light modulator to find 3D coordinates of an object |
| CN104897082A (en) * | 2015-06-08 | 2015-09-09 | 华东师范大学 | High-speed structured light generating and processing device based on intelligent mobile platform |
| CN107167929A (en) * | 2017-06-12 | 2017-09-15 | 华南师范大学 | Double mode optical ultra-discrimination microscopic imaging device and method based on DMD |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487740A (en) * | 2019-07-02 | 2019-11-22 | 西安理工大学 | Unginned cotton regain on-line measurement system and its measurement method based on Near-Infrared Absorption Method |
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Application publication date: 20180720 |