CN110312924A - Aridity sensor - Google Patents
Aridity sensor Download PDFInfo
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- CN110312924A CN110312924A CN201880012541.2A CN201880012541A CN110312924A CN 110312924 A CN110312924 A CN 110312924A CN 201880012541 A CN201880012541 A CN 201880012541A CN 110312924 A CN110312924 A CN 110312924A
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Classifications
-
- 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
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0232—Optical elements or arrangements associated with the device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
- H01L31/10—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors characterised by at least one potential-jump barrier or surface barrier, e.g. phototransistors
Abstract
Aridity sensor (1) has: the first bandpass filter (32), extracts the light of the biggish first band of absorption carried out by water；Second bandpass filter (42) extracts the light of the small second band of the absorptance first band carried out by water；The light for being reflected and having been penetrated the first band of the first bandpass filter (32) by object (2) is transformed to the first electric signal by the first acceptance part (33)；The light for being reflected and having been penetrated the second band of the second bandpass filter (42) by object (2) is transformed to the second electric signal by the second acceptance part (43)；And arithmetic processing section (56), the aridity based on the first electric signal and the second electrical signal detection object (2).The central wavelength of first band and the central wavelength of second band are the combinations that from 1400nm or more and 1600nm is selected, and are the combinations for obtaining the variation of signal ratio by becoming each material candidate in multiple material candidates of object (2).
Description
Technical field
The present invention relates to aridity sensors.
Background technique
Conventionally, there is known the amount of moisture for example contained in measurement object object using the absorption of the infrared ray carried out by moisture
Infrared moisture meter (for example, referring to patent document 1).If the amount of moisture that can contain in measurement object object, also can
Detect the aridity of the object.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 5-118984 bulletin
Summary of the invention
Subject to be solved by the invention
But, the absorption characteristic of the infrared ray variation due to the material according to object, so according to the difference of material,
It is actual conditions that deviation occurs in the testing result of aridity sensor.If occurred in the testing result of aridity sensor
Deviation, then the detection of aridity also lacks correctness.
So the purpose of the present invention is inhibit due to object material difference amount of moisture detection result from
Correctness that is poor and improving aridity detection.
For the means to solve the problem
In order to achieve the above object, the aridity sensor of a technical solution for the present invention is shone to object
And the aridity sensor of the aridity based on the above-mentioned object of reflection light detection from the object, have: illumination region, it will
Detection light comprising the big first band of the absorptance specified value carried out by water and the absorption comprising being carried out by water are above-mentioned regulations
The reference light for being worth second band below is issued towards above-mentioned object；First bandpass filter extracts above-mentioned first band
Light；Second bandpass filter extracts the light of above-mentioned second band；First acceptance part will be reflected and be penetrated by above-mentioned object
The above-mentioned detection light light of above-mentioned first bandpass filter, is transformed to the first electric signal；Second acceptance part, will be by above-mentioned object
The above-mentioned reference light light for reflecting and having penetrated above-mentioned second bandpass filter, is transformed to the second electric signal；And calculation process
Portion calculates the signal ratio of above-mentioned first electric signal and above-mentioned second electric signal, and the variation based on the signal ratio detects above-mentioned object
The aridity of object；What the central value of the wavelength about the half value by the maximum transmission as optical bandpass filter defined
The central wavelength of central wavelength, the central wavelength of above-mentioned first band and above-mentioned second band is from 1400nm or more and 1600nm
Combination chosen below is to obtain above-mentioned signal ratio by becoming each material candidate in multiple material candidates of above-mentioned object
Variation combination.
Invention effect
Aridity sensor for the present invention is able to suppress the amount of moisture detection of the difference of the material due to object
Result deviation and improve aridity detection correctness.
Detailed description of the invention
Fig. 1 is the structure for indicating the aridity sensor in relation to embodiment and the schematic diagram of object.
Fig. 2 is the block diagram for indicating the control structure of the aridity sensor in relation to embodiment.
Fig. 3 is the figure for indicating the extinction wave spectrum of moisture and vapor.
Fig. 4 is the figure for indicating the extinction wave spectrum of multiple material candidates as the object in relation to embodiment.
Fig. 5 is the curve graph of the change rate for indicating Normalized signal ratio and the relationship of aridity.
Specific embodiment
Hereinafter, being described in detail referring to aridity sensor of the attached drawing to embodiment for the present invention.In addition,
Embodiments described below is all to indicate a preferred concrete example of the invention.Thus, table in the following embodiments
Numerical value, shape, material, constituent element, the configuration of constituent element and connection form for showing etc. are an examples, are not that restriction is of the invention
The meaning.As a result, about independent right in the constituent element of the following embodiments and the accompanying drawings, in expression upper concept of the invention
There is no the constituent element recorded in it is required that, is set as arbitrary constituent element and is illustrated.
In addition, each figure is schematic diagram, not necessarily closely illustrate.Thus, such as in the various figures scale bar etc. is not
It is certain consistent.In addition, in the various figures, assigning identical label for substantially the same structure, repeat description is omitted or letter
Slightly change.
(embodiment)
[summary]
Firstly, being illustrated to the summary of the aridity sensor in relation to embodiment.
Fig. 1 is the structure for indicating the aridity sensor 1 in relation to embodiment and the schematic diagram of object 2.Fig. 2 is to indicate
The block diagram of the control structure of aridity sensor 1 in relation to embodiment.
Aridity sensor 1 is to shine to object 2, is based on the reflected light test object object 2 from the object 2 dry
The aridity sensor of dry degree.
In the present embodiment, as shown in Figures 1 and 2, the detection of aridity sensor 1 is being located at across space 3 and apart
Position at object 2 in the moisture that contains.
Object 2 is, for example, clothes etc. in the case where not being specially limited.It, can as the object 2 other than clothes
To enumerate the bedding of sheet, pillow-cases etc..For example, by the way that aridity sensor 1 is installed to clothes drying apparatus etc., it can
The degree of drying of clothes is confirmed.The generation etc. of the damage of clothes caused by thereby, it is possible to inhibit because of drying excessively.
Space 3 is the space (free space) between aridity sensor 1 and object 2.Space 3 is aridity sensor
The exterior space of 1 shell 10.
As shown in Figures 1 and 2, aridity sensor 1 have shell 10, illumination region 20, first by optical mode group 30, second by
Optical mode group 40 and signal processing circuit 50.
Hereinafter, being described in detail to each component of aridity sensor 1.
[shell]
Shell 10 is to accommodate illumination region 20, first by optical mode group 30, second by optical mode group 40 and signal processing circuit 50
Shell.Shell 10 is formed by the material of light-proofness.Thereby, it is possible to inhibit in ambient light incident to shell 10.Specifically, shell
10 by the resin material or metal material for being had light-proofness by the light of 40 light of optical mode group by optical mode group 30 and second for first
Material is formed.
The outer wall of shell 10 is provided with multiple openings, in these openings, the lens 21, first of illumination region 20 are installed
By optical mode group 30 lens 31 and second by optical mode group 40 lens 41.
[illumination region]
Illumination region 20 is to be by the detection light of the big first band of the absorptance specified value containing water and absorption containing water
The illumination region that the reference light of specified value second band below is issued towards object 2.Specifically, illumination region 20 has lens
21 and light source 22.
Lens 21 are the collector lens of the light that issues light source 22 to 2 optically focused of object.Lens 21 are the convex lens of resin
Mirror, but it is not limited to this.
Light source 22 is that issue include as at the first band of detection light and second band as reference light, peak wavelength
In LED (Light Emitting Diode, light emitting diode) light source of the continuous light of second band side.Specifically, light
Source 22 is the LED light source being made of compound semiconductor.
Fig. 3 is the figure for indicating the extinction wave spectrum of moisture and vapor.As shown in figure 3, moisture is in about 1450nm and about
The wavelength of 1940nm has absorption peak.Vapor is in the slightly lower wavelength of the absorption peak than moisture, specifically about 1350nm
The wavelength of~1400nm and about 1800nm~1900nm have absorption peak.
Therefore, as the first band for becoming detection light, the higher wave band of the absorbance of water is selected, as reference light
Second band, the wave band for selecting the dulling luminosity ratio first band of water small.Also, the mean wavelength of second band is made to compare first wave
The mean wavelength of long body is long.In addition, wavelength about the half value by the maximum transmission as optical bandpass filter
The central wavelength of the central wavelength that central value defines, the central wavelength of first band and second band be from 1400nm or more and
1600nm combination out chosen below.The combination is described in detail.
Fig. 4 is the figure for indicating the extinction wave spectrum of multiple material candidates as object 2 of related embodiment.Fig. 4 is
From the reference of 2003 speech purport collection 4Pp063 of molecular configuration comprehensive discussion meeting.Here, it as material candidate, such as instantiates
It is cotton, fiber crops, PEs (polyester), PET (polyethylene terephthalate), copper ammonia fiber, acetate fiber, PP (polypropylene), artificial
Silk, silk, vinylon, wool.Also the material other than these can be used as the material candidate of object 2 is formed.
Also, the central wavelength of first band is selected from 1450nm or more and 1500nm range below.For example, at this
The central wavelength of first band is set as 1450nm in embodiment, L1 is equivalent in Fig. 4.On the other hand, second band
The small 1530nm or more of the range of choice of central wavelength from the central wavelength of the dulling luminosity ratio first band of water and 1580nm or less
Range in select.For example, in the present embodiment, the central wavelength of second band being set as 1550nm, is equivalent in Fig. 4
L2。
Also, in Fig. 4, if by the extinction wave spectrum of each material candidate first band central wavelength L1 and the second wave
Compare at the central wavelength L2 of section, then for any one material candidate, at central wavelength L1 and central wavelength L2 all substantially
Same absorbance.In other words, the difference of the absorbance at central wavelength L1 and the absorbance at central wavelength L2 is for any one
Material candidate all very littles.In this way, using the of central wavelength L2 as detection light by using the first band of central wavelength L1
Two wave bands are able to suppress the influence of the difference of the material in aridity detection as reference light.
In addition, as described above, due to by the range of choice of the central wavelength of first band be set as 1450nm or more and
The range of choice of the central wavelength of second band is set as 1530nm or more and 1580nm model below by 1500nm range below
It encloses, as long as the influence of the difference of the material in aridity detection is to the degree allowed so combination within the scope of this.
But in order to further decrease the influence of the difference of material, as long as in the central wavelength and second band of selection first band
Cardiac wave is long to be combined so that the difference of the absorbance of each material candidate becomes minimum as a whole." each material time
The difference of the absorbance of choosing becomes minimum as a whole ", for example, being found out in first band to whole material candidates
The difference of the absorbance of the central wavelength of the absorbance and second band of cardiac wave strong point, and its aggregate value is made to become the smallest feelings
Condition.
In this way, since the irradiation of light source 22 continuously includes the light of first band and second band, so shining object 2
It penetrates small comprising the detection light for absorbing biggish first band and the absorptance first band comprising being carried out by water that are carried out by water
The reference light of second band.In turn, the difference bring influence by the material of object 2 is further suppressed.
[first by optical mode group]
As shown in Figure 1, first is had lens 31, the first bandpass filter 32 and the first acceptance part 33 by optical mode group 30.
Lens 31 are for will be from the reflected light that object 2 reflects to the collector lens of 33 optically focused of the first acceptance part.Lens
31 are for example fixed on shell 10 in such a way that focus is located at the light-receiving surface of the first acceptance part 33.Lens 31 are, for example, resin
Convex lens, but it is not limited to this.
First bandpass filter 32 is the bandpass filter from the light of reflection light extraction first band.Specifically, first
Bandpass filter 32 configures between lens 31 and the first acceptance part 33, and setting is penetrating lens 31 and entering to the first acceptance part 33
In the optical path for the reflected light penetrated.Also, the first bandpass filter 32 penetrates the light of first band, and by the wave band other than it
Light absorption.
First acceptance part 33 be by reflected by object 2 and penetrated the first bandpass filter 32 first band light by
Light, and it is transformed to the light receiving element of the first electric signal.First acceptance part 33 carries out light by the light of the first band arrived to light
Electricity transformation, generates the first electric signal corresponding with light income (i.e. the intensity) of the light.First electric signal generated is by signal
Processing circuit 50 exports.First acceptance part 33 is, for example, photodiode, and but not limited to this.For example, the first acceptance part 33
It is also possible to photistor or imaging sensor.
[second by optical mode group]
Second is had lens 41, the second bandpass filter 42 and the second acceptance part 43 by optical mode group 40.
Lens 41 are for will be from the reflected light that object 2 reflects to the collector lens of 43 optically focused of the second acceptance part.Lens
41 are for example fixed on shell 10 in such a way that focus is located at the light-receiving surface of the second acceptance part 43.Lens 41 are, for example, resin
Convex lens, but it is not limited to this.
Second bandpass filter 42 is the bandpass filter from the light of reflection light extraction second band.Specifically, second
Bandpass filter 42 configures between lens 41 and the second acceptance part 43, and setting is penetrating lens 41 and entering to the second acceptance part 43
In the optical path for the reflected light penetrated.Also, the second bandpass filter 42 penetrates the light of second band, and by the wave band other than it
Light absorption.
Second acceptance part 43 be by reflected by object 2 and penetrated the second bandpass filter 42 second band light by
Light, and it is transformed to the light receiving element of the second electric signal.Second acceptance part 43 carries out photoelectricity by the light of the second band to light
Transformation generates the second electric signal corresponding with light income (i.e. the intensity) of the light.Second electric signal generated is by signal
Circuit 50 is managed to export.Second acceptance part 43 is the light receiving element with 33 similar shape of the first acceptance part.That is, being light in the first acceptance part 33
In the case where quick diode, the second acceptance part 43 is also photodiode.
[signal processing circuit]
Signal processing circuit 50 is to carry out lighting control by the light source 22 to illumination region 20, and to from the first acceptance part 33
And second acceptance part 43 export the first electric signal and the second electric signal handled to detect the circuit of aridity.
Signal processing circuit 50 can both accommodate in the housing 10, or also may be mounted on the lateral surface of shell 10.
Alternatively, signal processing circuit 50 also can have the communication function of wireless communication etc., by the first electricity from the first acceptance part 33
Signal and the second electric signal from the second acceptance part 43 receive.
Specifically, as shown in Fig. 2, signal processing circuit 50 has light source control portion 51, the first enlarging section 52, second puts
Big portion 53, the first signal processing part 54, second signal processing unit 55 and arithmetic processing section 56.
Light source control portion 51 is made of driving circuit and microcontroller.Light source control portion 51 has the control for preserving light source 22
The nonvolatile memory of processing procedure sequence, the volatile memory as the temporary storage region for being used to execute program, input
Output port, the processor for executing program etc..
Light source control portion 51 controls light source 22, so that light source 22 is lighted and knocked out with defined light period quilt
It is repeated.Specifically, light source control portion 51 pass through the pulse signal of defined frequency (such as 1kHz) is defeated to light source 22
Out, light source 22 is made to light and knock out with defined light period.
The first electric signal amplification that first enlarging section 52 exports the first acceptance part 33 is simultaneously defeated to the first signal processing part 54
Out.Specifically, the first enlarging section 52 is the operational amplifier for amplifying the first electric signal.
First signal processing part 54 is made of microcontroller.First signal processing part 54, which has, to be preserved for the first telecommunications
Number processing routine nonvolatile memory, as be used to execute program temporary storage region volatile storage
Device, input/output port, the processor for executing program etc..First signal processing part 54 limit by frequency band to the first electric signal
After making and the amendment of bring phase delay being limited by frequency band by this, implement the multiplication process with the light period of light source 22.
Processing for first electric signal is so-called lock-in amplifier processing.Thereby, it is possible to inhibit to be based on from the first electric signal
Interfere the noise of light.
The second electric signal that second enlarging section 53 exports the second acceptance part 43 amplifies, defeated to second signal processing unit 55
Out.Specifically, the second enlarging section 53 is the operational amplifier for amplifying the second electric signal.
Second signal processing unit 55 is made of microcontroller.Second signal processing unit 55, which has, to be preserved for the second telecommunications
Number processing routine nonvolatile memory, as be used to execute program temporary storage region volatile storage
Device, input/output port, the processor for executing program etc..Second signal processing unit 55 limit by frequency band to the second electric signal
After making and the amendment of bring phase delay being limited by frequency band by this, implement the multiplication process with the light period of light source 22.
Processing for second electric signal is so-called lock-in amplifier processing.Thereby, it is possible to inhibit from the second electric signal based on dry
Disturb the noise of light.
What arithmetic processing section 56 was exported based on the first electric signal exported from the first acceptance part 33 and from the second acceptance part 43
Second electric signal, the ingredient that test object object 2 includes.Specifically, voltage water of the arithmetic processing section 56 based on the first electric signal
The flat ratio (signal ratio) with the voltage level of the second electric signal, the aridity of test object object 2.In the present embodiment, operation
Processing unit 56 is based on by the first signal processing part 54 treated the first electric signal and treated by second signal processing unit 55
Second electric signal, the amount of moisture that test object object 2 contains.Also, arithmetic processing section 56 is based on the amount of moisture detected, detection pair
As the aridity of object 2.Detection (calculating) method about specific aridity is illustrated later.
Arithmetic processing section 56 is, for example, microcontroller.Arithmetic processing section 56, which has, preserves the non-volatile of signal handler
Property memory, as being used to execute the volatile memory of temporary storage region of program, input/output port, execute journey
The processor etc. of sequence.
The aridity for the object 2 that arithmetic processing section 56 will test out is exported from input/output port to external equipment.
Alternatively, it is also possible to which display unit is arranged in aridity sensor 1 itself, aridity is shown on the display unit.
[signal processing (detection processing)]
Then, the signal processing (detection processing of aridity) carried out by arithmetic processing section 56 is illustrated.
In the present embodiment, arithmetic processing section 56 is by by the luminous energy Pd and reference light of the detection light for including in reflected light
Luminous energy Pr compare, the component amount for including in test object object 2.In addition, luminous energy Pd with from the first acceptance part 33 export first
The intensity of electric signal is corresponding, and luminous energy Pr is corresponding with the intensity of the second electric signal exported from the second acceptance part 43.
Luminous energy Pd is indicated by (formula 1) below.
(formula 1) Pd=Pd0 × Gd × Rd × Td × Aad × Ivd
Here, Pd0 is the luminous energy of the light of the first band as detection light in the light of the sending of light source 22.Gd is first wave
Joint efficiency (concentration ratio) of the light of section for the first acceptance part 33.Specifically, Gd is equivalent in the light of the sending of light source 22
As by the ratio of the part of a part (that is, the detection light for including in reflected light) of the ingredient of 2 scattered reflection of object.
Rd is the reflectivity by object 2 for detection light.Td is by the first bandpass filter 32 for the saturating of detection light
Cross rate.Ivd be the first acceptance part 33 for the detection light that includes in reflected light by photo sensitivity.
Aad is absorptivity of the ingredient (moisture) by including for detection light in object 2, is indicated by (formula 2) below.
(formula 2) Aad=10- α a × Ca × D
Here, α a is preset absorptivity, specifically, being the extinction system by ingredient (moisture) for detection light
Number.Ca is the volumetric concentration for the ingredient (moisture) for including in object 2.D is the ingredient as the absorption for contributing to detection light
2 times of contribution thickness of thickness.
More particularly, incident and internally reflected to object 2 in light in the object 2 that moisture disperses in heterogeneity
And from object 2 project in the case where, Ca is equivalent to the volumetric concentration that the ingredient of object 2 is included.In addition, D is equivalent to
Internal reflection and the optical path length until being projected from object 2.For example, object 2 be fiber etc. cancellous solid content,
Or in the case where the porous solid content of sponge etc., it is assumed that reflected light by the surface of solid content.In the case, for example,
Ca is the concentration for the moisture for including in the liquid phase for being covered with solid content.In addition, D is as the flat of the liquid phase for being covered with solid content
The thickness of equal property and it is scaled go out contribution thickness.
Thus, α a × Ca × D is equivalent to the component amount (amount of moisture) contained in object 2.By above it is found that according to right
The luminous energy Pd variation of the intensity of the first electric signal is equivalent to as the amount of moisture contained in object 2.In addition, compared with moisture, moisture
Absorbance it is minimum, it is possible to ignore.
Equally, the luminous energy Pr for being incident on the reference light in the second acceptance part 43 is indicated by (formula 3) below.
(formula 3) Pr=Pr0 × Gr × Rr × Tr × Ivr
In the present embodiment, according to ingredient (moisture) by containing in object 2 for the detection light of first band
It absorbs, the difference with the absorption of the reference light for second band, finds out the absorptivity Aad by moisture.In addition, reference light can be with
Regard as essentially without the ingredient draws contained in object 2, so it is found that being equivalent to the suction by moisture compared with (formula 1)
The item of yield Aad is not included in (formula 3).
In (formula 3), Pr0 is the luminous energy of the light of the second band as reference light in the light that light source 22 issues.Gr is
The joint efficiency (concentration ratio) for the second acceptance part 43 for the reference light that light source 22 issues.Specifically, Gr is equivalent to reference
In light as by the ratio of the part of a part (that is, the reference light for including in reflected light) of the ingredient of 2 scattered reflection of object
Example.Rr is the reflectivity by object 2 for reference light.Tr is the transmitance by the second bandpass filter 42 for reference light.
Ivr be the second acceptance part 43 for reflected light by photo sensitivity.
In the present embodiment, since the light, that is, detection light and reference light irradiated from light source 22 are by with coaxially and with hot spot ruler
One-by-one inch photograph is penetrated, so the joint efficiency Gd of detection light and the joint efficiency Gr of reference light are roughly equal.Further, since detection light and ginseng
Irradiation peak wavelength relatively, so the reflectivity Rd of detection light and the reflectivity Rr of reference light are roughly equal.
Thus, by taking the ratio of (formula 1) and (formula 3), export (formula 4) below.
(formula 4) Pd/Pr=Z × Aad
Here, Z is constant term, is indicated with (formula 5).
(formula 5) Z=(Pd0/Pr0) × (Td/Tr) × (Ivd/Ivr)
Luminous energy Pd0 and Pr0 are redefined for the initial output of light source 22 respectively.In addition, transmitance Td and transmitance Tr
It is preset respectively by the transmission characteristic of the first bandpass filter 32 and the second bandpass filter 42.By photo sensitivity Ivd and light
Sensitivity Ivr being preset by light characteristic by the first acceptance part 33 and the second acceptance part 43 respectively.Thus, the Z indicated by (formula 5)
It is considered as constant.
Arithmetic processing section 56 calculates the luminous energy Pd of detection light based on the first electric signal, calculates reference light based on the second electric signal
Luminous energy Pr.Specifically, the signal level (voltage level) of the first electric signal is equivalent to luminous energy Pd, the signal of the second electric signal
Horizontal (voltage level) is equivalent to luminous energy Pr.
Thus, arithmetic processing section 56 can be based on (formula 4) come the absorptivity Aad of the moisture contained in computing object object 2.By
This, arithmetic processing section 56 can calculate amount of moisture based on (formula 2).
Here, as described above, the first band of central wavelength L1 is by as detection light, the second band of central wavelength L2
By as reference light, so not influenced and the amount of moisture of test object object 2 by the difference of material.In other words, make not consider
The material of object 2 can also correctly detect the amount of moisture of object 2.
In addition, being also contemplated in the space 3 there is also moisture (vapor) and will test light by vapor and referring to light absorption
Situation.For example, the central wavelength in first band selects from 1450nm or more and 1500nm range below, second band
In the case that central wavelength is selected from 1530nm or more and 1580nm range below, according to the extinction wave of the vapor of Fig. 3
The relationship of spectrum is also able to suppress by the influence of the extinction of vapor.
Also, arithmetic processing section 56 is based on amount of moisture come the aridity of test object object 2.For example, if setting object 2
Weight when dry is W1, if the amount of moisture that object 2 contains is W2 (being equivalent to α a × Ca × D), then aridity Dr can be by
Dr=W1/ (W1+W2) × 100 [%] is found out.
In addition, even if not finding out amount of moisture, if be previously stored in the nonvolatile memory of arithmetic processing section 56
Indicate the change rate and object 2 of signal ratio (ratio of the voltage level of the voltage level of the first electric signal and the second electric signal)
The table of the relationship of aridity, then arithmetic processing section 56 also can be based on the signal detected than the doing come test object object 2 with table
Dry degree Dr.
For example, table is defined with the calibration curve of the change rate and the relationship of aridity Dr that indicate signal ratio.It is specific and
Speech, if when the weight when drying of object 2 is W1, sets the amount of moisture that object 2 contains as W2 (being equivalent to α a × Ca × D)
Aridity Dr is indicated by Dr=W1/ (W1+W2) × 100 [%].In addition, when to set the first electric signal as S1, the second electric signal be S2
Signal ratio R indicated by R=S1/S2.If aridity be the first electric signal in the case where 100% be s1, the second electric signal is
Reference signal ratio r when s2 is indicated by r=s1/s2.The change rate of signal ratio by signal ratio R and reference signal ratio r ratio (specification
Change signal ratio) R/r expression.Also, calibration curve is found out with the relationship than R/r and aridity Dr.
Fig. 5 is the curve graph for indicating the relationship of change rate (Δ R/r) and aridity Dr of Normalized signal ratio.Such as Fig. 5 institute
Show, if aridity Dr becomes bigger than 60%, linear variation is substantially presented in change rate Δ R/r.Therefore, it is by aridity Dr
The first approximation straight line C of 60% or more change rate Δ R/r and aridity Dr are as calibration curve.As long as being made based on the calibration curve
Table is simultaneously prestored in the nonvolatile memory of arithmetic processing section 56.
[effect etc.]
It as above, according to the present embodiment, is light to be issued to object 2 and based on the reflection from the object 2
The aridity sensor 1 of the aridity of light detection object 2, has: illumination region 20, will provide comprising the absorptance carried out by water
The detection light and the absorption comprising being carried out by water that are worth big first band are the reference light directions of specified value second band below
Object 2 issues；First bandpass filter 32, extracts the light of first band；Second bandpass filter 42, extracts second band
Light；First acceptance part 33 will be reflected by object 2 and penetrated the detection light light of the first bandpass filter 32, be transformed to
One electric signal；Second acceptance part 43 will be reflected by object 2 and penetrated the reference light light of the second bandpass filter 42, become
It is changed to the second electric signal；And arithmetic processing section 56, the signal ratio of the first electric signal and the second electric signal is calculated, the signal is based on
The variation of ratio carrys out the aridity of test object object；About the half value by the maximum transmission as optical bandpass filter
The central wavelength that the central value of wavelength defines, the central wavelength of first band is from 1450nm or more and 1500nm range below
Selection, the central wavelength of second band are selected from 1530nm or more and 1580nm range below.
According to this structure, it is selected from 1450nm or more and 1500nm range below due to the central wavelength of first band
It selects, the central wavelength of second band is selected from 1530nm or more and 1580nm range below, so being able to suppress aridity
The influence of the difference of material in detection.Thus, it is possible to improve the correctness of aridity detection.
In addition, the calibration curve of relationship of the arithmetic processing section 56 based on the change rate and aridity for indicating signal ratio, by signal
Than being transformed to aridity.
According to this structure, it is transformed to aridity since the signal detected by arithmetic processing section 56 ratio is based on calibration curve,
So can be improved treatment effeciency compared with the case where calculating aridity one by one.
In addition, weight when setting the drying of object 2 as W1, set aridity of the amount of moisture that object 2 contains as W2 when
Dr is indicated by Dr=W1/ (W1+W2) × 100 [%]；If signal ratio R when the first electric signal is S1, the second electric signal is S2 is by R
=S1/S2 is indicated；If aridity be the first electric signal in the case where 100% be s1, benchmark letter when the second electric signal is s2
It number is indicated than r by r=s1/s2；Change rate is indicated by the ratio R/r of signal ratio R and reference signal ratio r；Calibration curve by than R/r with
The relationship of aridity Dr is found out.
According to this structure, it is found out due to calibration curve by the relationship than R/r and aridity Dr, so it can be considered that benchmark is believed
Aridity Dr is found out number than r.That is, can also find out aridity Dr even if not knowing the weight W1 when drying of object 2.
In addition, calibration curve be aridity Dr be 60% or more when ratio R/r and aridity Dr first approximation straight line.
The first approximation straight line C of ratio R/r and aridity Dr when according to this structure, due to being 60% or more by aridity Dr
As calibration curve, so the relationship than R/r and aridity Dr can be simplified.Thus, it is possible to make being easy to make of table.
In addition, such as illumination region 20 has the light for issuing the light comprising first band and second band, and at peak wavelength
In the LED light source (light source 22) of the continuous light of second band side.
According to this structure, the light of first band and the light of second band can be irradiated by 1 light source 22.Further, since should
Light source 22 is LED light source, so because aging causes the energy of first band and second band with same rate of change.As a result, with heat
The light source of type is compared, influence caused by being able to suppress because of aging.In turn, since light source 22 is by lesser second wave of the absorption of moisture
Section side is as peak wavelength, so being able to suppress the temperature change because of amount of moisture bring attenuation rate.
In addition, such as the first acceptance part 33 and the second acceptance part 43 have the light receiving element of mutual homotype.
According to this structure, since the first acceptance part 33 and the second acceptance part 43 have the light receiving element of mutual homotype, so
The aging of the sensitivity of first acceptance part 33 and the second acceptance part 43 is same trend, is able to suppress the influence of aging.
(other)
More than, aridity sensor 1 for the present invention is illustrated based on above-mentioned embodiment, but the present invention
It is not limited to above-mentioned embodiment.
For example, in the above-described embodiment, the central wavelength of first band is illustrated from 1450nm or more and 1500nm or less
Range in selection, second band central wavelength the case where being selected from 1530nm or more and 1580nm range below carry out
Explanation.But as long as the central wavelength of first band and the central wavelength of second band are from 1400nm or more and 1600nm
Combination chosen below is to obtain the variation of signal ratio by each material candidate in multiple material candidates as object 2
Combination.At this point, the central wavelength of second band is the wavelength longer than the central wavelength of first band.Described here
The variation of signal ratio is the variation of the signal ratio relative to reference signal ratio.As long as meeting the combination of this point, it will be able to will
The influence of the difference of material in aridity detection inhibits in the degree that can be allowed.
In addition, in the above-described embodiment, instantiating the case where light source 22 is LED light source, but light source is also possible to partly lead
Volumetric laser element or organic EL element etc..
In addition, in the above-described embodiment, instantiate 1 light source 22 issue comprising as detection light first band and at
Situation for the continuous light of the second band of reference light is illustrated.But it is also possible to multiple light sources are set, 1 light source
Detection light is issued, other light sources issue reference light.
In addition, in the above-described embodiment, instantiating the light source control portion 51, first having in signal processing circuit 50 and believing
The case where number processing unit 54, second signal processing unit 55 and arithmetic processing section 56 are made of dedicated microcontroller respectively carries out
Illustrate, but signal processing circuit can also be used as entirety by 1 microcontroller implementation.
In addition to this, for each embodiment implement form obtained from the various modifications that those skilled in the art expect,
Or it is real and without departing from the spirit and scope of the invention arbitrarily combining the constituent element of each embodiment and function
Existing form is also included in the present invention.
Label declaration
1 aridity sensor
2 objects
20 illumination regions
22 light sources (LED light source)
30 first by optical mode group
32 first bandpass filters
33 first acceptance parts
40 second by optical mode group
42 second bandpass filters
43 second acceptance parts
56 arithmetic processing sections
Claims (according to the 19th article of modification of treaty)
1. a kind of (after amendment) aridity sensor shines to object, above-mentioned based on the reflection light detection from the object
The aridity of object,
Above-mentioned aridity sensor has:
Illumination region, by the detection light comprising the big first band of the absorptance specified value that is carried out by water and the suction comprising being carried out by water
Receipts are that the reference light of above-mentioned specified value second band below is issued towards above-mentioned object；
First bandpass filter extracts the light of above-mentioned first band；
Second bandpass filter extracts the light of above-mentioned second band；
First acceptance part will be reflected by above-mentioned object and penetrated the above-mentioned detection light light of above-mentioned first bandpass filter,
It is transformed to the first electric signal；
Second acceptance part will be reflected by above-mentioned object and penetrated the above-mentioned reference light light of above-mentioned second bandpass filter,
It is transformed to the second electric signal；And
Arithmetic processing section calculates the signal ratio of above-mentioned first electric signal and above-mentioned second electric signal, the variation based on the signal ratio
Detect the aridity of above-mentioned object；
The middle cardiac wave that the central value of wavelength about the half value by the maximum transmission as optical bandpass filter defines
Long, the central wavelength of the central wavelength of above-mentioned first band and above-mentioned second band is multiple materials by becoming above-mentioned object
Each material candidate in candidate obtains the combination of the variation of above-mentioned signal ratio,
The central wavelength of above-mentioned first band is selected from 1450nm or more and 1500nm range below；
The central wavelength of above-mentioned second band is selected from 1530nm or more and 1580nm range below.
(2. deletion)
(3. after amendment) aridity sensor as described in claim 1,
The calibration curve of relationship of the above-mentioned arithmetic processing section based on the change rate and above-mentioned aridity for indicating above-mentioned signal ratio, will be above-mentioned
Signal ratio is transformed to above-mentioned aridity.
4. aridity sensor as claimed in claim 3,
If the aridity Dr when amount of moisture that the weight when drying of above-mentioned object is W1, above-mentioned object contains is W2 is by Dr
=W1/ (W1+W2) × 100 [%] is indicated；
If above-mentioned signal ratio R when above-mentioned first electric signal is S1, above-mentioned second electric signal is S2 is indicated by R=S1/S2；
If above-mentioned aridity be above-mentioned first electric signal in the case where 100% be s1, base when above-mentioned second electric signal is s2
Calibration signal ratio r is indicated by r=s1/s2；
Above-mentioned change rate is indicated by the ratio R/r of above-mentioned signal ratio R and said reference signal ratio r；
Above-mentioned calibration curve is found out by the above-mentioned relationship than R/r and above-mentioned aridity Dr.
5. aridity sensor as claimed in claim 4,
Above-mentioned calibration curve is that the above-mentioned first approximation than R/r and above-mentioned aridity Dr that above-mentioned aridity Dr is 60% or more is straight
Line.
The aridity sensor of (6. after amendment) as described in any one of claim 1,3~5,
Above-mentioned illumination region is that issue include the wave band as above-mentioned detection light and wave band as above-mentioned reference light, and peak wavelength
The LED light source of continuous light in above-mentioned second band side.
The aridity sensor of (7. after amendment) as described in any one of claim 1,3~6,
Above-mentioned first acceptance part and above-mentioned second acceptance part have the light receiving element of mutual homotype.
Claims (7)
1. a kind of aridity sensor shines to object, based on the above-mentioned object of reflection light detection from the object
Aridity,
Above-mentioned aridity sensor has:
Illumination region, by the detection light comprising the big first band of the absorptance specified value that is carried out by water and the suction comprising being carried out by water
Receipts are that the reference light of above-mentioned specified value second band below is issued towards above-mentioned object；
First bandpass filter extracts the light of above-mentioned first band；
Second bandpass filter extracts the light of above-mentioned second band；
First acceptance part will be reflected by above-mentioned object and penetrated the above-mentioned detection light light of above-mentioned first bandpass filter,
It is transformed to the first electric signal；
Second acceptance part will be reflected by above-mentioned object and penetrated the above-mentioned reference light light of above-mentioned second bandpass filter,
It is transformed to the second electric signal；And
Arithmetic processing section calculates the signal ratio of above-mentioned first electric signal and above-mentioned second electric signal, the variation based on the signal ratio
Detect the aridity of above-mentioned object；
The middle cardiac wave that the central value of wavelength about the half value by the maximum transmission as optical bandpass filter defines
Long, the central wavelength of the central wavelength of above-mentioned first band and above-mentioned second band is from 1400nm or more and 1600nm or less is selected
The combination selected out is to obtain the change of above-mentioned signal ratio by becoming each material candidate in multiple material candidates of above-mentioned object
The combination of change.
2. aridity sensor as described in claim 1,
The central wavelength of above-mentioned first band is selected from 1450nm or more and 1500nm range below；
The central wavelength of above-mentioned second band is selected from 1530nm or more and 1580nm range below.
3. aridity sensor as claimed in claim 1 or 2,
The calibration curve of relationship of the above-mentioned arithmetic processing section based on the change rate and above-mentioned aridity for indicating above-mentioned signal ratio, will be above-mentioned
Signal ratio is transformed to above-mentioned aridity.
4. aridity sensor as claimed in claim 3,
If the aridity Dr when amount of moisture that the weight when drying of above-mentioned object is W1, above-mentioned object contains is W2 is by Dr
=W1/ (W1+W2) × 100 [%] is indicated；
If above-mentioned signal ratio R when above-mentioned first electric signal is S1, above-mentioned second electric signal is S2 is indicated by R=S1/S2；
If above-mentioned aridity be above-mentioned first electric signal in the case where 100% be s1, base when above-mentioned second electric signal is s2
Calibration signal ratio r is indicated by r=s1/s2；
Above-mentioned change rate is indicated by the ratio R/r of above-mentioned signal ratio R and said reference signal ratio r；
Above-mentioned calibration curve is found out by the above-mentioned relationship than R/r and above-mentioned aridity Dr.
5. aridity sensor as claimed in claim 4,
Above-mentioned calibration curve is that the above-mentioned first approximation than R/r and above-mentioned aridity Dr that above-mentioned aridity Dr is 60% or more is straight
Line.
6. such as aridity sensor according to any one of claims 1 to 5,
Above-mentioned illumination region is that issue include the wave band as above-mentioned detection light and wave band as above-mentioned reference light, and peak wavelength
The LED light source of continuous light in above-mentioned second band side.
7. such as aridity sensor according to any one of claims 1 to 6,
Above-mentioned first acceptance part and above-mentioned second acceptance part have the light receiving element of mutual homotype.
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| JP2017034176 | 2017-02-24 | ||
| JP2017-034176 | 2017-02-24 | ||
| PCT/JP2018/005161 WO2018155289A1 (en) | 2017-02-24 | 2018-02-15 | Dryness sensor |
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| Publication Number | Publication Date |
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| CN110312924A true CN110312924A (en) | 2019-10-08 |
| CN110312924B CN110312924B (en) | 2021-11-23 |
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| JP (1) | JP6712792B2 (en) |
| CN (1) | CN110312924B (en) |
| MY (1) | MY193492A (en) |
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| WO2020255797A1 (en) * | 2019-06-20 | 2020-12-24 | パナソニックＩｐマネジメント株式会社 | Sensitivity adjustment plate and method for manufacturing sensor device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2018155289A1 (en) | 2019-11-07 |
| JP6712792B2 (en) | 2020-06-24 |
| MY193492A (en) | 2022-10-17 |
| CN110312924B (en) | 2021-11-23 |
| WO2018155289A1 (en) | 2018-08-30 |
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