CN100460859C - Sensing fiber infrared water determiner - Google Patents
Sensing fiber infrared water determiner Download PDFInfo
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- CN100460859C CN100460859C CNB2006100262654A CN200610026265A CN100460859C CN 100460859 C CN100460859 C CN 100460859C CN B2006100262654 A CNB2006100262654 A CN B2006100262654A CN 200610026265 A CN200610026265 A CN 200610026265A CN 100460859 C CN100460859 C CN 100460859C
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Abstract
A infrared water analyzer of optical fiber induction type consists of power supply, CPU and peripheral circuit connected to CPU, display module, key board and A/D converter, LED driving circuit, measurement LED, reference LED, double-emission optical fiber bundle, receiving optical fiber bundle, photoelectric diode and locking amplifier. It is featured as utilizing emitting-receiving optical fiber bundle as measurement induction circuit for raising accuracy of measurement.
Description
Technical field
The present invention relates to a kind of sensing fiber infrared water determiner, belong to the technical field of electronics drimeter.
Background technology
Compare with 105 ℃ of constant weight methods of classics, the Infrared survey method is one of several quick measuring methods, its principle is to utilize the absorption to the infrared light of specific wavelength of the moisture that contains in the measured matter, and different in moisture is corresponding differently to absorb light intensity, thereby obtains the relation between light intensity and the moisture.Domestic infrared moisture meter adopts luminous power big at present, and the tungsten filament lamp as light source of spectral line width utilizes light-splitting devices such as monochromatic filter or grating to filter out the moisture absorption wavelength again and a series of reference wavelength is then measured.In the world, the whole grain of the 9100 types near infrared fast measuring instrument that logical (Perten) instrument company of the ripple of Sweden produces, can measure 6 kinds of compositions such as moisture in the seed of grain and oil crops such as wheat, corn, soybean, rapeseed, albumen, fat, its principle is the reflective light intensity that obtains various compositions with broad spectrum light source after sample reflection and grating beam splitting, measures material composition with this.It can measure whole grain sample, need not pulverize, but fast measuring 120 duplicate samples in 1 minute.The shortcoming of background technology is the complicated and manufacturing cost costliness of light channel structure.
Summary of the invention
The objective of the invention is to release a kind of sensing fiber infrared water determiner, this instrument has signal processing circuit to adopt advantages such as the simple and low cost of manufacture of general amplifying circuit, light channel structure.
For achieving the above object, the present invention by the following technical solutions.Existing accompanying drawings is as follows.
A kind of sensing fiber infrared water determiner, contain power supply, CPU and the peripheral circuit that is connected thereon: display module, keyboard and modulus converter A/D, power supply just, the negative voltage output terminal is respectively VCC end and ground wire, the output terminal of modulus converter A/D is connected with the I/O mouth of CPU, contain the program of operation below the order CPU execution at the ROM of CPU inside internal memory, described operation comprises the work of commander's keyboard, control that following led drive circuit drives following measurement LEDD2 and following reference LEDD1 is alternately luminous, that accepts modulus converter A/D output terminal output converts the infrared sensing signal of digital quantity to by analog-digital conversion a/d, commander's display module shows measurement result, it is characterized in that, it also contains led drive circuit, measure LED D2, with reference to LED D1, two launching fiber bundles 1, receive fibre bundle 2, photodiode D3 and lock-in amplifier, measure LEDD2 and be respectively 1450nm and 1310nm with reference to the radiative wavelength of LEDD1, two launching fiber bundles 1 and reception fibre bundle 2 are formed the send-receive fibre bundles, the optical fiber of forming two launching fiber bundles 1 and reception fibre bundle 2 is glass optical fiber, the incident end of the exit end of two launching fiber bundles 1 and reception fibre bundle 2 merges conglobate send-receive face, described send-receive face is vertical with the optical axis of described send-receive fibre bundle, optical fiber stochastic distribution in the exit end of two launching fiber bundles 1 is arranged conglobate emission light-emitting face 12, core as described send-receive face, the interior optical fiber stochastic distribution of incident end that receives fibre bundle 2 is arranged in the reception light entrance face 20 of annular, periphery as described send-receive face, the optical fiber of forming two launching fiber bundles 1 is divided into two beam splitting 10 at random at the emission light incident side place of two launching fiber bundles 1,11, two beam splitting 10, two planes of incidence of 11: the measuring light plane of incidence 14 and the reference light plane of incidence 13 respectively with two beam splitting 10,11 optical axis is vertical, the measuring light plane of incidence 14 and the reference light plane of incidence 13 with respectively to locating tab assembly LED D2 and with reference to the mode of the light-emitting area of LED D1 with measure LED D2 and be close to reference to the light-emitting area of LED D1, at the reception light exit side place that receives fibre bundle 2 light-emitting face 21 of reception is arranged, it is vertical with the optical axis that receives fibre bundle 2 to receive light-emitting face 21, receiving light-emitting face 21 is close to the mode of the light-sensitive surface of alignment light electric diode D3 and the light-sensitive surface of photodiode D3, measure LED D2 with reference to LED D1 respectively with the measurement LED D2 output terminal of led drive circuit be connected with reference to LED D1 output terminal, the output terminal of photodiode D3 is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected with the input end of modulus converter A/D.
When measuring the contained moisture of sample 30, described send-receive face is placed on 5-15mm place, surface apart from sample 30 in the mode on the surface of aiming at sample 30.Sample 30 is paddy, paper, timber, pipe tobacco, tealeaves, coffee etc.
Compare with background technology, infrared moisture meter of the present invention has the following advantages:
(1) replaces traditional sensing light path with the send-receive fibre bundle
The light source that the traditional infrared Moisture Meter adopts the luminescence spectrum broad in addition light-splitting device such as optical filter or grating is formed the send-receive light path, promptly measures the sensing light path, not only complex structure but also involve great expense.Infrared moisture meter of the present invention adopts the send-receive fibre bundle as the send-receive light path, promptly measures the sensing light path, has both simplified the structure of measuring the sensing light path, greatly reduces the manufacturing cost of sensing light path again.
(2) antijamming capability of circuit is strong
Measured signal is a ultra-weak electronic signal that is flooded by noise, is difficult to its effective amplification with general method.Infrared moisture meter of the present invention is used the principle that locking is amplified, with dutycycle is that the square-wave signal of 1:1 drive to be measured LED D2 and with reference to LED D1, order is measured LED D2 and is sent the light signal of light intensity alternation with reference to LED D1, the irradiation sample, make the measured signal of photodiode D3 output AC, carry out active bandpass filtering by measured signal to described interchange, suppress noise, exchange amplification, the direct current demodulation, improve signal to noise ratio (S/N ratio), obtain high-gain and high sensitivity simultaneously, increase substantially measuring accuracy.
Description of drawings
Fig. 1 is the structured flowchart of sensing fiber infrared water determiner of the present invention.
Fig. 2 is the Fibre Optical Sensor light channel structure of sensing fiber infrared water determiner of the present invention and the placement location of sample disc.
Fig. 3 is the cross-sectional view of described send-receive fibre bundle.
Fig. 4 is the circuit diagram of sensing fiber infrared water determiner of the present invention.
Embodiment
Now describe sensing fiber infrared water determiner of the present invention and principle of work in conjunction with the accompanying drawings and embodiments in detail.
Embodiment:
Present embodiment has and the identical structure of above-mentioned sensing fiber infrared water determiner, it is further characterized in that: led drive circuit contains the first integrated circuit U1, the second integrated circuit U2, the 3rd integrated circuit U3, measure LEDD2, with reference to LED D1, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, first capacitor C 1, second capacitor C 2 and the first transistor T1, the first integrated circuit U1, the model of the second integrated circuit U2 and the 3rd integrated circuit U3 is respectively NE555,74LS74 and MAX4624, measure LEDD2 and be respectively L7850-01 and L7866 with reference to the model of LED D1, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the resistance of the 5th resistance R 5 is respectively 1K Ω, 2K Ω, 1K Ω, 1K Ω, 1K Ω, first capacitor C 1, the electric capacity of second capacitor C 2 is respectively 0.01 μ F, 100PF, the model of the first transistor T1 is 9014, the 1st pin ground connection of the first integrated circuit U1, the 2nd pin of the first integrated circuit U1 is connected with the 6th pin, the 4th pin of the first integrated circuit U1 is connected the back and is connected with the VCC end with the 8th pin, first capacitor C 1 is connected across between the 5th pin and ground wire of the first integrated circuit U1, the 6th pin of the first integrated circuit U1 is connected with the 2nd pin, second capacitor C 2 is connected across between the 6th pin and ground wire of the first integrated circuit U1, first resistance R 1 is connected across between the 7th pin of the 6th pin of the first integrated circuit U1 and the first integrated circuit U1, second resistance R 2 is connected across between the 7th pin and VCC end of the first integrated circuit U1, the 14th pin of the second integrated circuit U2 is connected with ground wire with the VCC end respectively with the 7th pin, the 2nd pin of the second integrated circuit U2 is connected with the 6th pin, the 3rd pin of the first integrated circuit U1 is connected with the 3rd pin of the second integrated circuit U2, the grounded emitter of the first transistor T1, the 3rd resistance R 3 is connected across between the base stage of the 5th pin of the second integrated circuit U2 and the first transistor T1, the collector of the first transistor T1 is connected with negative pole with reference to LED D1 with the negative pole of measuring LEDD2 respectively, the positive pole of measuring LEDD2 is connected through the 4th pin of the 4th resistance R 4 with the 3rd integrated circuit U3, positive pole with reference to LED D1 is connected through the 6th pin of the 5th resistance R 5 with the 3rd integrated circuit U3, the 1st pin of the 3rd integrated circuit U3 is connected with the P1.2 pin of CPU through the J1 end, the 2nd pin of the 3rd integrated circuit U3 is connected the back and is connected the 3rd pin ground connection of the 3rd integrated circuit U3 with the VCC end with the 5th pin; Lock-in amplifier contains photodiode D3, the 4th integrated circuit U4, the 5th integrated circuit U5, the 6th integrated circuit U6, the 7th integrated circuit U7, the 8th integrated circuit U8, the 9th integrated circuit U9, the tenth integrated circuit U10, the 11 integrated circuit U11, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15, the 16 resistance R 16, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, the 9th capacitor C 9 and the tenth capacitor C 10, the model of photodiode D3 is G8422-03, the 4th integrated circuit U4, the 5th integrated circuit U5, the 6th integrated circuit U6, the 7th integrated circuit U7, the 8th integrated circuit U8, the 9th integrated circuit U9, the tenth integrated circuit U10, the model of the 11 integrated circuit U11 is respectively LF356, AD829, AD829, AD829, AD829, OP177, CD4066 and CD4069, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15, the resistance of the 16 resistance R 16 is respectively 200K, 2K Ω, 2K Ω, 2K Ω, 10K Ω, 2K, 30K Ω, 2K Ω, 2K Ω, 2K Ω, 3K Ω, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, the 9th capacitor C 9, the electric capacity of the tenth capacitor C 10 is respectively 0.01 μ F, 3300PF, 0.01 μ F, 1000PF, 0.01 μ F, 0.01 μ F, 0.01 μ F, 1 μ F, 0.01 μ F, the positive pole of photodiode D3 is connected with ground wire with the 2nd pin of the 4th integrated circuit U4 respectively with negative pole, the 3rd pin ground connection of the 4th integrated circuit U4, the 6th resistance R 6 is connected across between the 2nd pin and the 6th pin of the 4th integrated circuit U4, the 3rd pin ground connection of the 5th integrated circuit U5, the 4th capacitor C 4 be connected across between the 2nd pin and the 6th pin of the 5th integrated circuit U5 after the 8th resistance R 8 is in parallel, between the 2nd pin of the 3rd capacitor C 3 and the 6th pin that is connected across the 4th integrated circuit U4 after the 8th resistance R 8 is connected and the 5th integrated circuit U5, the 3rd pin ground connection of the 6th integrated circuit U6, the 6th capacitor C 6 be connected across between the 2nd pin and the 6th pin of the 6th integrated circuit U6 after the tenth resistance R 10 is in parallel, between the 2nd pin of the 5th capacitor C 5 and the 6th pin that is connected across the 5th integrated circuit U5 after the 9th resistance R 9 is connected and the 6th integrated circuit U6, the 3rd pin ground connection of the 7th integrated circuit U7, the 12 resistance R 12 is connected across between the 2nd pin and the 6th pin of the 7th integrated circuit U7, between the 2nd pin of the 7th capacitor C 7 and the 6th pin that is connected across the 6th integrated circuit U6 after the 11 resistance R 11 is connected and the 7th integrated circuit U7, the 3rd pin ground connection of the 8th integrated circuit U8, the 9th capacitor C 9 be connected across between the 2nd pin and the 6th pin of the 8th integrated circuit U8 after the 14 resistance R 14 is in parallel, between the 2nd pin of the 8th capacitor C 8 and the 6th pin that is connected across the 7th integrated circuit U7 after the 13 resistance R 13 is connected and the 8th integrated circuit U8, the 3rd pin ground connection of the 9th integrated circuit U9, the tenth capacitor C 10 is connected across between the 2nd pin and ground wire of the 9th integrated circuit U9, the 11 capacitor C 11 be connected across between the 2nd pin and the 6th pin of the 9th integrated circuit U9 after the 16 resistance R 16 is in parallel, the 12nd pin of the tenth integrated circuit U10 is connected with the 2nd pin with the 1st pin of the 11 integrated circuit U11 respectively with the 6th pin, the 6th pin of the 6th pin of the 7th integrated circuit U7 and the 8th integrated circuit U8 is connected with the 10th pin with the 8th pin of the tenth integrated circuit U10 respectively, the 9th pin of the tenth integrated circuit U10 is connected with the 11st pin, the 15 resistance R 15 is connected across between the 9th pin of the 2nd pin of the 9th integrated circuit U9 and the tenth integrated circuit U10, the 5th pin of the second integrated circuit U2 is connected with the 1st pin of the 11 integrated circuit U11, and the 6th pin of the 9th integrated circuit U9 is connected with the input end of modulus converter A/D.
Principle of work
Moisture in the material exists stronger absorption band at infrared wavelength 1450nm place.Therefore when wavelength be the near infrared light of 1450nm to sample, a part of light will be absorbed by sample, another part is then by its reflection.So,, just can obtain the information of the water cut of sample as long as measure incident light, reflected light and diffuse reflection light intensity.
By Kubelka-Munk theory,
R is the reflectivity of sample in the formula, and K is an absorption coefficient, and S is a scattering coefficient, and B is a constant.
In certain range of light intensity, be following relation between the contained moisture C of absorption coefficient K and sample:
K＝ε*C (3-2)
ε is a proportionality constant in the formula.
Consider the definition of the reflectivity R of sample:
I in the formula
0Be the incident light intensity, I is catoptrical intensity.
With (3-2), (3-3) substitution (3-1) formula,
The contained moisture C of sample can be drawn by following formula:
As long as therefore record I, I
0With the value of S, just can record the moisture that sample contains.
When measuring the contained moisture of sample, with the send-receive of infrared moisture meter of the present invention surface in the face of accurate sample, both are at a distance of 5-15mm.Infrared moisture meter of the present invention adopts the reflective infrared detection method of dual wavelength to measure the contained moisture of sample.The work of CPU control led drive circuit, driving is connected on the measurement LED output terminal of led drive circuit respectively and alternately launches infrared light with reference to the measurement LED D2 of LED output terminal with reference to LED D1.The infrared light wavelength of measuring LED D2 and launching with reference to LED D1 is respectively 1450nm and 1310nm.Measure LED D2 and with reference to the emission infrared light 15 of LED D1 emission two planes of incidence: the measuring light plane of incidence 13 and the reference light plane of incidence 14, two beam splitting 10,11 and two launching fiber bundles 1 by the incident end place of two launching fiber bundles 1, conduct to circular send-receive face, the sample 30 in the irradiation sample disc 3.The reflects infrared light 22 of sample 30 reflections conducts to and receives light-emitting face 21, the light-sensitive surface of irradiates light electric diode D3 by the reception light entrance face 20 and the reception fibre bundle 2 of annular.The light-sensitive surface of photodiode D3 converts the reflects infrared light 22 that receives to electric signal, from its output terminal output, is added on the input end of lock-in amplifier.The reflects infrared light 22 that photodiode D3 receives is faint modulated light signals, and photodiode D3 converts thereof into faint modulation signal, as the input signal of lock-in amplifier by opto-electronic conversion.Described input signal belongs to simulating signal.Lock-in amplifier carries out bandpass filtering, demodulation, amplification to described input signal.Lock-in amplifier is sent to amplified output signal the input end of modulus converter A/D.Modulus converter A/D becomes digital signal with the analog signal conversion of its input end, from its output terminal output, is sent to the I/O mouth of CPU.CPU utilizes the digital signal of input, calculates the contained moisture of sample 30.CPU control display module shows the moisture that sample 30 is contained.
Infrared moisture meter of the present invention at first will be calibrated before use.Be that paddy is example now, it is described with sample 30.Get 10g paddy, adopt the preparation of standard oven drying method to contain the standard model of certain moisture.Then this standard model is put into the sample disc 3 of instrument, measured the contained moisture of this standard model with infrared moisture meter of the present invention.The process of measuring is as follows: referring to Fig. 1 and Fig. 4.After the energized, the first integrated circuit U1 (555 time base circuit) produces the electric impulse signal that frequency is 20kHz.This signal is through the second follow-up integrated circuit U22 frequency division, and frequency of the output terminal of second integrated circuit U2 output is that 10KHz, dutycycle are the square-wave signal of 1:1.This this square-wave signal adds to the base stage of the first transistor T1 (9014) as modulation signal through the 3rd resistance R 3.The collector of the first transistor T1 is connected to 2 light emitting diodes: measure LEDD2 and with reference to the negative pole of LED D1, voltage VCC (5V) adds to through the 3rd integrated circuit U3 (MAX4624) and measures LEDD2 and with reference to the positive pole of LED D1, the 3rd integrated circuit U3 is an either-or switch, whichever light emitting diode work like this, the infrared light that they send all is a modulated light signal that frequency is 10KHz, control the 3rd integrated circuit U3 by CPU, just can select which work in two light emitting diodes.After pressing the measurement key, CPU measures LED D2 by the 1st foot control system of the 3rd integrated circuit U3 and with reference to LED D1 alternation, shines through 1 pair of sample 30 of launching fiber bundle.Make earlier with reference to LED D1 and work, after photodiode D3 receives the infrared light of launching with reference to LED D1, be translated into faint photocurrent, after this photocurrent amplifies through the 4th integrated circuit U4, its output is a voltage signal, because the feeble signal that this voltage signal is flooded by noise, therefore in order to obtain the electric signal of needed 10KHz, behind the 4th integrated circuit U4, connected 2 grades of active band-pass filters of forming by the 5th integrated circuit U5 and the 6th integrated circuit U6, be intended to that useful signal is carried out frequency-selecting and amplify.Output termination the 7th integrated circuit U7 of the 2nd grade of active band-pass filter, it exports an end that is connected two switches of the tenth integrated circuit U10 (CD4066) with the output of the 8th integrated circuit U8 respectively, the other end of these two switches links to each other and connects a low-pass filter of being made up of the 9th integrated circuit U9, and its control gating signal is modulated square wave signal and inversion signal thereof.Inversion signal is provided by the output terminal of the 11 integrated circuit U11.Electronic switch is made multiplier and is used, filtered useful signal and reference electrical signal are multiplied each other, obtain the each harmonic component sum of useful signal, after these harmonic component sums enter the low-pass filter of the 9th integrated circuit U9, high fdrequency component is by filtering, only remaining with and receive the proportional DC voltage component of photodiode D3 output electric signal, and the power of the output electric signal of photodiode D3 is to be directly proportional with the contained moisture of sample, so the contained moisture of this DC component and sample is directly proportional.This signal is changed by modulus converter A/D, just can in CPU, obtain with reference to light emitting diode correspondent voltage digital quantity.Make again and measure LEDD2 work, similarly also can obtain and measure LED correspondent voltage digital quantity.These two voltage digital amounts are compared, and promptly measuring voltage digital quantity/reference voltage digital quantity just can obtain a ratio.Because at the contained moisture of calibration stage sample is known, therefore above-mentioned ratio is just corresponding with a known moisture value.By measurement to the standard model that contains different in moisture, just can obtain one group of ratio corresponding and the relation curve of the moisture value-ratio that draws with it, this curve is carried out match, obtain the function expression of this curve, and it is solidificated among the ROM in the CPU.
When the user uses, the paddy of moisture content value the unknown is put into sample disc 3, start power supply, after pressing the measurement key, in CPU, just can obtain one and the corresponding ratio of this tested paddy, in the functional relation that this ratio substitution has been set up, just can obtain its moisture value, then this moisture value that records is presented on the display.One-shot measurement has just been finished.
As need measure other material such as timber, paper, coffee etc. contained moisture, then the same with paddy, at first according to standard sample is calibrated infrared moisture meter of the present invention, set up functional relation and it is solidificated among the ROM in the CPU, then the sample of unknown moisture is measured, measurement result is presented on the display.
Claims (2)
1. sensing fiber infrared water determiner, contain power supply, CPU and the peripheral circuit that is connected thereon: display module, keyboard and analog to digital converter (A/D), power supply just, the negative voltage output terminal is respectively VCC end and ground wire, the output terminal of analog to digital converter (A/D) is connected with the I/O mouth of CPU, contain the program of operation below the order CPU execution at the ROM of CPU inside internal memory, described operation comprises the work of commander's keyboard, control that following led drive circuit drives following measurement LED (D2) and following reference LED (D1) is alternately luminous, that accepts analog to digital converter (A/D) output terminal output converts the infrared sensing signal of digital quantity to by analog to digital converter (A/D), commander's display module shows measurement result, it is characterized in that, it also contains led drive circuit, measure LED (D2), with reference to LED (D1), two launching fiber bundles (1), receive fibre bundle (2), photodiode (D3) and lock-in amplifier, measure LED (D2) and be respectively 1450nm and 1310nm with reference to the radiative wavelength of LED (D1), two launching fiber bundles (1) and reception fibre bundle (2) are formed the send-receive fibre bundle, the optical fiber of forming two launching fiber bundles (1) and reception fibre bundle (2) is glass optical fiber, the incident end of the exit end of two launching fiber bundles (1) and reception fibre bundle (2) merges conglobate send-receive face, described send-receive face is vertical with the optical axis of described send-receive fibre bundle, optical fiber stochastic distribution in the exit end of two launching fiber bundles (1) is arranged conglobate emission light-emitting face (12), core as described send-receive face, the interior optical fiber stochastic distribution of incident end that receives fibre bundle (2) is arranged in the reception light entrance face (20) of annular, periphery as described send-receive face, the optical fiber of forming two launching fiber bundles (1) is divided into two beam splitting (10 at random at the emission light incident side place of two launching fiber bundles (1), 11), two beam splitting (10,11) two planes of incidence: the measuring light plane of incidence (14) and the reference light plane of incidence (13) respectively with two beam splitting (10,11) optical axis is vertical, the measuring light plane of incidence (14) and the reference light plane of incidence (13) with respectively to locating tab assembly LED (D2) and with reference to the mode of the light-emitting area of LED (D1) with measure LED (D2) and be close to reference to the light-emitting area of LED (D1), at the reception light exit side place that receives fibre bundle (2) reception light-emitting face (21) is arranged, it is vertical with the optical axis that receives fibre bundle (2) to receive light-emitting face (21), receiving light-emitting face (21) is close to the mode of the light-sensitive surface of alignment light electric diode (D3) and the light-sensitive surface of photodiode (D3), measure LED (D2) with reference to LED (D1) respectively with measurement LED (D2) output terminal of led drive circuit be connected with reference to LED (D1) output terminal, the output terminal of photodiode (D3) is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected with the input end of analog to digital converter (A/D).
2. sensing fiber infrared water determiner according to claim 1, it is characterized in that, led drive circuit contains first integrated circuit (U1), second integrated circuit (U2), the 3rd integrated circuit (U3), first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), first electric capacity (C1), second electric capacity (C2) and the first transistor (T1), first integrated circuit (U1), the model of second integrated circuit (U2) and the 3rd integrated circuit (U3) is respectively NE555,74LS74 and MAX4624, measure LED (D2) and be respectively L7850-01 and L7866 with reference to the model of LED (D1), first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the resistance of the 5th resistance (R5) is respectively 1K Ω, 2K Ω, 1K Ω, 1K Ω, 1K Ω, first electric capacity (C1), the electric capacity of second electric capacity (C2) is respectively 0.01 μ F, 100PF, the model of the first transistor (T1) is 9014, the 1st pin ground connection of first integrated circuit (U1), the 2nd pin of first integrated circuit (U1) is connected with the 6th pin, the 4th pin of first integrated circuit (U1) is connected the back and is connected with the VCC end with the 8th pin, first electric capacity (C1) is connected across between the 5th pin and ground wire of first integrated circuit (U1), the 6th pin of first integrated circuit (U1) is connected with the 2nd pin, second electric capacity (C2) is connected across between the 6th pin and ground wire of first integrated circuit (U1), first resistance (R1) is connected across between the 7th pin of the 6th pin of first integrated circuit (U1) and first integrated circuit (U1), second resistance (R2) is connected across between the 7th pin and VCC end of first integrated circuit (U1), the 14th pin of second integrated circuit (U2) is connected with ground wire with the VCC end respectively with the 7th pin, the 2nd pin of second integrated circuit (U2) is connected with the 6th pin, the 3rd pin of first integrated circuit (U1) is connected with the 3rd pin of second integrated circuit (U2), the grounded emitter of the first transistor (T1), the 3rd resistance (R3) is connected across between the base stage of the 5th pin of second integrated circuit (U2) and the first transistor (T1), the collector of the first transistor (T1) is connected with negative pole with reference to LED (D1) with the negative pole of measuring LED (D2) respectively, the positive pole of measuring LED (D2) is connected through the 4th pin of the 4th resistance (R4) with the 3rd integrated circuit (U3), positive pole with reference to LED (D1) is connected through the 6th pin of the 5th resistance (R5) with the 3rd integrated circuit (U3), the 1st pin of the 3rd integrated circuit (U3) is connected with the P1.2 pin of CPU through the J1 end, the 2nd pin of the 3rd integrated circuit (U3) is connected the back and is connected the 3rd pin ground connection of the 3rd integrated circuit (U3) with the VCC end with the 5th pin; Lock-in amplifier contains photodiode (D3), the 4th integrated circuit (U4), the 5th integrated circuit (U5), the 6th integrated circuit (U6), the 7th integrated circuit (U7), the 8th integrated circuit (U8), the 9th integrated circuit (U9), the tenth integrated circuit (U10), the 11 integrated circuit (U11), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12), the 13 resistance (R13), the 14 resistance (R14), the 15 resistance (R15), the 16 resistance (R16), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), the 6th electric capacity (C6), the 7th electric capacity (C7), the 8th electric capacity (C8), the 9th electric capacity (C9) and the tenth electric capacity (C10), the model of photodiode (D3) is G8422-03, the 4th integrated circuit (U4), the 5th integrated circuit (U5), the 6th integrated circuit (U6), the 7th integrated circuit (U7), the 8th integrated circuit (U8), the 9th integrated circuit (U9), the tenth integrated circuit (U10), the model of the 11 integrated circuit (U11) is respectively LF356, AD829, AD829, AD829, AD829, OP177, CD4066 and CD4069, the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12), the 13 resistance (R13), the 14 resistance (R14), the 15 resistance (R15), the resistance of the 16 resistance (R16) is respectively 200K Ω, 2K Ω, 2K Ω, 2K Ω, 10K Ω, 2K Ω, 30K Ω, 2K Ω, 2K Ω, 2K Ω, 3K Ω, the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), the 6th electric capacity (C6), the 7th electric capacity (C7), the 8th electric capacity (C8), the 9th electric capacity (C9), the electric capacity of the tenth electric capacity (C10) is respectively 0.01 μ F, 3300PF, 0.01 μ F, 1000PF, 0.01 μ F, 0.01 μ F, 0.01 μ F, 1 μ F, 0.01 μ F, the positive pole of photodiode (D3) is connected with ground wire with the 2nd pin of the 4th integrated circuit (U4) respectively with negative pole, the 3rd pin ground connection of the 4th integrated circuit (U4), the 6th resistance (R6) is connected across between the 2nd pin and the 6th pin of the 4th integrated circuit (U4), the 3rd pin ground connection of the 5th integrated circuit (U5), the 4th electric capacity (C4) be connected across between the 2nd pin and the 6th pin of the 5th integrated circuit (U5) after the 8th resistance (R8) is in parallel, between the 2nd pin of the 3rd electric capacity (C3) and the 6th pin that is connected across the 4th integrated circuit (U4) after the 8th resistance (R8) is connected and the 5th integrated circuit (U5), the 3rd pin ground connection of the 6th integrated circuit (U6), the 6th electric capacity (C6) be connected across between the 2nd pin and the 6th pin of the 6th integrated circuit (U6) after the tenth resistance (R10) is in parallel, between the 2nd pin of the 5th electric capacity (C5) and the 6th pin that is connected across the 5th integrated circuit (U5) after the 9th resistance (R9) is connected and the 6th integrated circuit (U6), the 3rd pin ground connection of the 7th integrated circuit (U7), the 12 resistance (R12) is connected across between the 2nd pin and the 6th pin of the 7th integrated circuit (U7), between the 2nd pin of the 7th electric capacity (C7) and the 6th pin that is connected across the 6th integrated circuit (U6) after the 11 resistance (R11) is connected and the 7th integrated circuit (U7), the 3rd pin ground connection of the 8th integrated circuit (U8), the 9th electric capacity (C9) be connected across between the 2nd pin and the 6th pin of the 8th integrated circuit (U8) after the 14 resistance (R14) is in parallel, between the 2nd pin of the 8th electric capacity (C8) and the 6th pin that is connected across the 7th integrated circuit (U7) after the 13 resistance (R13) is connected and the 8th integrated circuit (U8), the 3rd pin ground connection of the 9th integrated circuit (U9), the tenth electric capacity (C10) is connected across between the 2nd pin and ground wire of the 9th integrated circuit (U9), the 11 electric capacity (C11) be connected across between the 2nd pin and the 6th pin of the 9th integrated circuit (U9) after the 16 resistance (R16) is in parallel, the 12nd pin of the tenth integrated circuit (U10) is connected with the 2nd pin with the 1st pin of the 11 integrated circuit (U11) respectively with the 6th pin, the 6th pin of the 6th pin of the 7th integrated circuit (U7) and the 8th integrated circuit (U8) is connected with the 10th pin with the 8th pin of the tenth integrated circuit (U10) respectively, the 9th pin of the tenth integrated circuit (U10) is connected with the 11st pin, the 15 resistance (R15) is connected across between the 9th pin of the 2nd pin of the 9th integrated circuit (U9) and the tenth integrated circuit (U10), the 5th pin of second integrated circuit (U2) is connected with the 1st pin of the 11 integrated circuit (U11), and the 6th pin of the 9th integrated circuit (U9) is connected with the input end of analog to digital converter (A/D).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100262654A CN100460859C (en) | 2006-04-29 | 2006-04-29 | Sensing fiber infrared water determiner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100262654A CN100460859C (en) | 2006-04-29 | 2006-04-29 | Sensing fiber infrared water determiner |
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| CN1982871A CN1982871A (en) | 2007-06-20 |
| CN100460859C true CN100460859C (en) | 2009-02-11 |
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| CNB2006100262654A Expired - Fee Related CN100460859C (en) | 2006-04-29 | 2006-04-29 | Sensing fiber infrared water determiner |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063603B (en) * | 2012-12-25 | 2015-04-29 | 浙江工业大学 | Machine-fried Longjing tea moisture content on-line detection device |
| CN103364360B (en) * | 2013-03-14 | 2015-09-30 | 深圳先进技术研究院 | Moisture teller |
| CN103528989B (en) * | 2013-10-30 | 2018-10-02 | 合肥汇众知识产权管理有限公司 | Near infrared moisture measuring instrument |
| EP3641525B1 (en) | 2017-06-20 | 2023-02-22 | Monsanto Technology LLC | Device and method for measuring moisture in corn on ear |
| CN112649395B (en) * | 2019-10-10 | 2024-03-08 | 漳州英特捷自动化科技有限公司 | Online near-infrared moisture meter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0617868B2 (en) * | 1990-04-13 | 1994-03-09 | 株式会社テイエルブイ | Infrared moisture analyzer |
| JPH0774782B2 (en) * | 1990-07-13 | 1995-08-09 | 株式会社テイエルブイ | Near infrared humidity measuring device |
| CN2648438Y (en) * | 2003-09-23 | 2004-10-13 | 四川省科学城高达测控公司 | Infrared moisture sensor |
| US20050260764A1 (en) * | 2004-05-24 | 2005-11-24 | Grigsby John M Jr | Method and apparatus for monitoring liquid for the presence of an additive |
| JP6017868B2 (en) * | 2011-11-04 | 2016-11-02 | 太陽誘電株式会社 | Demultiplexer, filter and communication module |
| JP7074782B2 (en) * | 2017-06-30 | 2022-05-24 | トロフィー エスアーエス | Extraoral dental imaging device with patient positioning accessory detection |
-
2006
- 2006-04-29 CN CNB2006100262654A patent/CN100460859C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0617868B2 (en) * | 1990-04-13 | 1994-03-09 | 株式会社テイエルブイ | Infrared moisture analyzer |
| JPH0774782B2 (en) * | 1990-07-13 | 1995-08-09 | 株式会社テイエルブイ | Near infrared humidity measuring device |
| CN2648438Y (en) * | 2003-09-23 | 2004-10-13 | 四川省科学城高达测控公司 | Infrared moisture sensor |
| US20050260764A1 (en) * | 2004-05-24 | 2005-11-24 | Grigsby John M Jr | Method and apparatus for monitoring liquid for the presence of an additive |
| JP6017868B2 (en) * | 2011-11-04 | 2016-11-02 | 太陽誘電株式会社 | Demultiplexer, filter and communication module |
| JP7074782B2 (en) * | 2017-06-30 | 2022-05-24 | トロフィー エスアーエス | Extraoral dental imaging device with patient positioning accessory detection |
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| CN1982871A (en) | 2007-06-20 |
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