CN1007014B - Specific light intensity determination method with optical rotation and high-speed sugar-inspection apparatus - Google Patents
Specific light intensity determination method with optical rotation and high-speed sugar-inspection apparatusInfo
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- CN1007014B CN1007014B CN 87102016 CN87102016A CN1007014B CN 1007014 B CN1007014 B CN 1007014B CN 87102016 CN87102016 CN 87102016 CN 87102016 A CN87102016 A CN 87102016A CN 1007014 B CN1007014 B CN 1007014B
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- light
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Abstract
The present invention relates to a method for measuring a lighting intensity ratio of optical rotation and a quick saccharimeter. The method for measuring a lighting intensity ratio of optical rotation is a beam of polarized light continuously passes through an optical rotation medium and a polarized beam splitting prism, the light intensity ratio of two splitting beams emitted from the polarized beam splitting prism is detected, and thereby, a polarization angle of incident light of the prism is determined. The optical rotation of the optical rotation medium is obtained. With the method, the quick saccharimeter can simultaneously, directly, and continuously detect the optical rotation, the refractometer brix and the temperature of a dynamic sugar sample, and indexes, such as sugar content, purity, etc., are obtained through an electronic computer. The quick saccharimeter has the advantages of quick detection speed, high stability and high precision, and the quick saccharimeter is suitable for industrialized on-line detection.
Description
The present invention relates to the assay method of optically-active and the instrument of fast detecting sugar part.
Sugar is expected the detection of sugar content, normally records optical activity, hammer degree and the temperature of sample, calculates according to the certain experience formula again.Calculating the gained result revises by the desired environment temperature of international examination criteria (20 ℃).In these parameters, the measurement of optical activity is crucial.
In October, 1980, Brazilian patent BR(PI) 7803313 discloses a kind of novel sugar-inspection apparatus that adopts LASER Light Source and Faraday magneto-optical modulation technique, improved accuracy of detection and reliability than traditional instrument." external agronomy (beet the fascicle) " first phase in 1984 has been introduced the automatic saccharous detector that Japanese Teng Chuan controls invention such as the prosperous people of grade.This instrument adopts technology such as He-Ne Lasers light source, magneto-optic modulation, composite sample pond and robot calculator, can detect optical activity, hammer degree, the temperature of sample easy, accurately, quickly.It can also be to directly detecting without chemically treated sample.
But existing sugar-inspection apparatus all can only detect the sample of static state, and can not detect dynamic sample.Therefore, can not be used for online detection, not satisfy need of industrial production.This is that this method can not detect the continually varying signal because existing instrument adopts the detection of sample optical activity is " secondary quadrature school zero method ".In recent years, the extinction ratio measurement method of another kind of optically-active detection method-beam split occurred in other technical field, but realized that the circuit of this method is complicated, its reliability and stability and arithmetic speed are restricted, also can not find a kind of desirable scaling method, bring difficulty to high Precision Detection.And this method only is suitable for birefringence beam splitter such as Wollaston (Wollaston) prism, and when adopting the film Amici prism, makes signal Processing very complicated.
The objective of the invention is, propose a kind of can to optical activity carry out dynamic test than light intensity determination method, and design speed sugar-inspection apparatus according to this method, simultaneously, directly optical activity, hammer degree, the temperature of sugar material are carried out kinetic measurement, make it to have high detection speed and sensitivity, and high accuracy of detection, to realize industrial online detection effectively, satisfy the needs of modern production.
Being meant of optically-active of the present invention: the polarized light at a branch of known polarization angle is passed through an optically-active medium and a polarization splitting prism in succession than light intensity assay method, measurement is by the beam intensity ratio of two divided beams of described polarization splitting prism outgoing, definite funtcional relationship that beam intensity ratio had according to two divided beams of the incident light polarization angle of polarization splitting prism and outgoing, determine described polarization splitting prism polarization of incident light angle by described beam intensity ratio, draw the optical activity of described optically-active medium by the known polarization angle of this polarization angle and optically-active medium incident light.
Optically-active of the present invention than light intensity assay method, be adapted to various polarization splitting prisms, data processing is simple, can save device, reduces cost, improves detection speed and be applied to industrial online detection.Can carry out highly sensitive detection, obtain high-precision scaling method.
Below in conjunction with drawings and Examples making than light intensity assay method of optically-active of the present invention further specified.
As shown in Figure 1, a branch of directional light I by the outgoing of optically-active medium will be broken down into two-beam with the direction incident vertical with saturating polarization by reflection Amici prism, and wherein a branch of is transmitted light T, and a branch of is reflected light R.Described polarization by reflection Amici prism can be the polarization block prism, various polarization by reflection Amici prisms such as Glan-Tang Poxun (Glan-Thompson) prism, Niccol (Nicol) prism.If what use is the polarization block prism, and light source is natural light, and the energy (light intensity) of two divided beams that then are decomposed is than approaching 1, and promptly its saturating inverse ratio is 1(T/R=1).If light source is the linearly polarized light that a branch of electric vector vibration direction and the plane of incidence of described prism become the Q angle, then the energy of the two-beam that decomposites through plane of polarization ratio is a definite value, and the promptly alleged in theory saturating inverse ratio of light intensity is the function of Q.This functional relation is:
Wherein △ is the error correction item.
As shown in Figure 2, above-mentioned function relation curve II and empirical curve I show good consistance, and error therebetween can well be revised.By the prism polarization of incident light angle Q that is drawn and the polarization angle of original light, can obtain the optical activity of optically-active medium.If adopt class birefringent polarizing Amici prisms such as wollaston prism or Glan-Foucault (Glan-Fric) prism, the beam intensity ratio between ordinary light after the decomposition (O light) and the unusual light (e light) also has same characteristic.As described in Figure 3, establish a branch of directional light to wollaston prism incident, the O light of outgoing and the beam intensity ratio of e light are determined: Io/Ie=a.If incident light is the linearly polarized light that polarization angle Q is arranged.Then the beam intensity ratio of its emergent light is the function at Q angle.When regarding the Wo Shi prism as perfect medium, this functional relation is:
△ is the error correction item in the formula.
Fig. 4 has described the theoretical curve II and the corresponding to situation of empirical curve I of this funtcional relationship, and error wherein can well be revised.
What Fig. 5 had pointed out optically-active of the present invention can obtain the example of high-precision scaling method than light intensity determination method.As shown in the drawing, electric bridge two silicon photocells (14) (15) direct and the polariscopy device join.The sensitivity of galvanometer G is every scale 2.2 * 10
-9Ampere.When one timing of the polarization direction of light, electric bridge can be at I
1/ I
2=R
2/ R
1Condition be issued to balance.If the polarization direction changes, electric bridge can be issued to balance in corresponding condition again.So continue, just can obtain a Q=Q(I
1/ I
2)=Q(R
2/ R
1) continuous curve.With the polarimeter that this calibration curve is made, precision can reach 0.05%.
Quick saccharous detector of the present invention comprises that He-Ne Lasers light source, the polarizer, optical splitter, plane mirror, an end have sample cell, refractive power detection system, the optically-active detection system of 45 ° of wedge shape refractive power grooves and the data acquisition circuit that joins with microcomputer, and described optical splitter is divided into transmitted light beam and folded light beam with incident beam.The technical characterstic of saccharous detector of the present invention is, it also comprises a system for detecting temperature that is made of the operational amplifier (17) that is embedded in the PN temperature sensor (9) in the sample cell loam cake and joins with it, described refractive power detection system comprises on the emergent light light path that places described 45 ° of wedge shape refractive power grooves and can receive described emergent light and be connected to the CCD image sensor (16) of driver, receive described outgoing beam and with the polarizing beam splitter (11) of its beam splitting being provided with on the emergent light light path by its outgoing again behind the transmitted light beam incident sample cell of described optical splitter, a beam expanding lens (10) places between sample cell and the polarizing beam splitter (11), on the emergent light light path of described polarizing beam splitter (11), be provided with silicon photocell (14) (15) and its folded light beam of reception that receives its transmitted light beam and measure its intensity and the silicon photocell (12) (13) of measuring its intensity, described silicon photocell (12) (14) joins with operational amplifier (18) and (19) respectively with (13) (15), by described beam expanding lens (10), polarizing beam splitter (11), silicon photocell (12) (13) (14) (15) and operational amplifier (18) (19) constitute described optically-active detection system, and the driver of described CCD image sensor and operational amplifier (17) (18) (19) all join with data acquisition circuit.
Speed sugar-inspection apparatus of the present invention can be simultaneously, directly optical activity, refractive power hammer degree and three physical quantitys of temperature of sugar material are carried out the Fast Dynamic measurement, draw optical activity, the refractive power hammer degree value of having passed through the temperature correction, and draw sugar content, the purity of sample by the processing of microcomputer, print the result.Its detection has high speed, sensitivity and precision, can apply to the online detection of industrialization effectively.
Below in conjunction with drawings and Examples speed sugar-inspection apparatus of the present invention is made and to be further specified.
Fig. 6 has pointed out a kind of practical structures of instrument of the present invention.Constituted LASER Light Source by Laser Power Devices (1) and laser instrument (2), wherein laser instrument (2) for magnetic rises inclined to one side helium-neon laser, can send wavelength and be 6328A ° He-Ne Lasers, the extinction ratio of its linearly polarized light is 1: 2000.Optical splitter (4) is the right angle polarization splitting prism, between laser instrument (2) and optical splitter (4) polarizer (3) is arranged, and this polarizer is a Glan-Foucault prism.One end of sample cell (8) is 45 ° of wedge shape refractive power grooves, and this sample cell is respectively equipped with the inflow entrance and the flow export of sample.The excitation beam of being sent by light source plays through the polarizer (3) that the back is logical partially resolves into two-beam for optical splitter (4), and the rotation polarizer (3) can change the light intensity ratio of two divided beams continuously.
The light that sees through optical splitter (4) passes sample in sample cell (8) and the pond with positive 45 ° polarization angle.When sample contains sugar, can change the polarization of incident light angle with sugared content with being directly proportional.Polarizing beam splitter in the polariscopy system (11) is a wollaston prism.After beam expanding lens (10) expands bundle, inject wollaston prism by the light of sample cell (8) outgoing, be decomposed into the orthogonal two-beam in polarization direction, its beam intensity ratio is decided by to enter the polarization angle of the light beam of Wo Shi prism.Silicon photocell (12) (13) (14) (15) has been formed photoelectric sensor with operational amplifier (18) (19), as measuring circuit than light intensity.In this circuit, transport and placing device is converted to voltage signal with the photocurrent of silicon photocell, to keep the good linear characteristic of opto-electronic conversion.Signal at circuit is divided by in (comparing) process, eliminated the influence of light intensity fluctuation, temperature fluctuation naturally.Wherein a pair of silicon photocell (14) (15) is accepted two transmitted light beams of Wo Shi prism as master reference, and another as aiding sensors, accepts two folded light beams of Wo Shi prism to silicon photocell (12) (13).This two bundles folded light beam has identical characteristic with outgoing beam.The signal of the expression beam intensity that above-mentioned two pairs of silicon photocells (14) (15) and (12) (13) are recorded is sent into data acquisition circuit (21) through transport and placing device (18) (19) in the same way, sends into microcomputer (22) again and handles.Microcomputer (22) is to the signal of photoelectric sensor output, determines the polarization of incident light angle according to the ratio of the light intensity of two outgoing beams and the functional relation at incident light polarization angle, thereby draws optical activity.
Light by optical splitter (4) reflection produces refraction through plane mirror (5), after fourier lens (6) expansion bundle, condenser lens (7) focus on, vertically enters 45 ° of wedge shape refracted slots of sample cell (8).When the sample refractive index in the sample cell (8) is determined, refractive direction by the outgoing beam behind the sample cell is determined, CCD image sensor (16) is very accurately measured this refractive direction, thereby the refractive index of measuring draws the refractive power hammer degree that is directly proportional with it.It is the stacked 512 unit line style devices that form of silicon semiconductor of 15 μ m that the CCD image sensor that saccharous detector of the present invention adopted can be selected for use by sensitization thickness, when minimum diameter is that the luminous point of 30 μ m is when CCD device linear direction moves, minimum displacement also can be identified, and can accurately be measured by 250 changing values of the every variation 0.0001 of 1.3330 beginnings in refractive index.This scope is adapted to the measurement range of sugar hammer degree 0～30Bx, scale division value 0.01Bx.
Temperature sensor in the system for detecting temperature (9) is-the PN junction temperature sensor, it is embedded in the loam cake of sample cell (8), and by transport and placing device (17), can be fast, accurate measuring samples temperature.Gathered after optically-active, refractive power and the temperature to data acquisition circuit (21) timesharing, sent into microcomputer (22) and handle.
Centrifugal sampling thief connects with sample cell (8) as an attachment device of speed sugar-inspection apparatus of the present invention.If sample is infused clearly, then directly it is sent in the sample cell, if muddy, send in the sample cell again after then handling by this centrifugal sample thief.
Every performance of the automatic sugar-inspection apparatus of people such as speed sugar-inspection apparatus of the present invention and prosperous beginning of Japanese Teng Chuan development is compared as follows table:
| Content | The Teng Shi instrument | Instrument of the present invention |
| The mensuration mode | Optical activity: utilize the faraday pond to measure collimation optical zero point; Hammer degree: differential seat angle index method; Utilize the composite sample pond to measure simultaneously | Optical activity: beam splitting type is than light intensity determination method.The hammer degree: index method utilizes the composite sample pond to measure simultaneously. |
| Determination object | Beet, cane suger solution | Sugar juice such as beet, sugarcane |
| Sample size is measured precision | About 20ml 0-30%(sugar content, hammer degree) | About 50ml 0-30%(sugar content, hammer degree) |
| Measure precision | ± 0.05%(sugar content, hammer degree) | ± 0.03%(sugar content, hammer degree) |
| Minute | About 40 seconds/each sample | Static mode: about 10 seconds/each sample dynamical fashion: with 10 seconds touring detections of sampling rate. |
| Show | Sugar content, hammer degree, purity | Sugar content, hammer degree, purity |
| Light source | Helium-neon laser 1m ω | Magnetic plays inclined to one side helium-neon laser 3m ω |
Description of drawings:
Fig. 1 has pointed out the branch luminous effect of saturating polarization by reflection Amici prism;
Fig. 2 be the described prism of Fig. 1 than light intensity function curve;
Fig. 3 has pointed out the branch luminous effect of birefringent polarizing Amici prism;
Fig. 4 be the described prism of Fig. 3 than light intensity function curve;
Fig. 5 is the actual track of high-precision calibrating method;
Fig. 6 is the practical structures of instrument of the present invention.
In above-mentioned figure, be with the straight line of arrow to represent along the light of direction of arrow propagation, and:
The 1-Laser Power Devices
The 2-laser instrument
The 3-polarizer
The 4-optical splitter
The 5-plane mirror
The 6-extender lens
The 7-condenser lens
8-has the sample cell of 45 ° of refractive power grooves
The 9-temperature sensor
The 10-beam expanding lens
The 11-polarizing beam splitter
12,13,14,15-silicon photocell
The 16-CCD image sensor
17,18,19-operational amplifier
The 20-CCD driver
The 21-data acquisition circuit
22-microcomputer system
Claims (5)
1, a kind of optically-active than light intensity assay method, the invention is characterized in, described method is, the polarized light at a branch of known polarization angle is passed through an optically-active medium and a polarization splitting prism in succession, measurement is by the beam intensity ratio of two divided beams of described polarization splitting prism outgoing, definite funtcional relationship that beam intensity ratio had according to two beam splitting of the incident light polarization angle of polarization splitting prism and outgoing, determine described polarization splitting prism polarization of incident light angle by described beam intensity ratio, draw the optical activity of described optically-active medium again by the known polarization angle of this polarization angle and optically-active medium incident light.
2, a kind of quick saccharous detector, comprise the He-Ne Lasers light source, the polarizer, optical splitter, plane mirror, one end has the sample cell of 45 ° of wedge shape refractive power grooves, the refractive power detection system, optically-active detection system and the data acquisition circuit that joins with microcomputer, feature of the present invention is, it also comprises a system for detecting temperature, described system for detecting temperature is made of the operational amplifier (17) that is embedded in the PN junction temperature sensor (9) in the sample cell loam cake and joins with it, described refractive power detection system comprises on the emergent light light path that places described 45 ° of wedge shape refractive power grooves and can receive described emergent light and be connected to the CCD image sensor (16) of driver, receive described outgoing beam and with the polarizing beam splitter (11) of its beam splitting being provided with on the emergent light light path by its outgoing again behind the transmitted light beam incident sample cell of described optical splitter, a beam expanding lens (10) places between sample cell and the polarizing beam splitter (11), on the emergent light light path of described polarizing beam splitter (11), be provided with the silicon photocell (14) that receives its transmitted light beam and measure its intensity, (15) and receive its folded light beam and measure the silicon photocell (12) (13) of its intensity, described silicon photocell (12) (14) joins with operational amplifier (18) and (19) respectively with (13) (15), by described beam expanding lens (16), polarizing beam splitter (11), silicon photocell (12) (13) (14) (15) and operational amplifier (18) (19) constitute described optically-active detection system, and the driver of described CCD image sensor and operational amplifier (17) (18) (19) all join with data acquisition circuit.
3, quick saccharous detector according to claim 2 is characterized in that, described optical splitter is the right angle polarization splitting prism.
4, quick saccharous detector according to claim 2 is characterized in that, the described polarizer is a glan-foucault prism.
5, quick saccharous detector according to claim 2 is characterized in that, is provided with extender lens and condenser lens between described plane mirror and the sample cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87102016 CN1007014B (en) | 1987-04-18 | 1987-04-18 | Specific light intensity determination method with optical rotation and high-speed sugar-inspection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87102016 CN1007014B (en) | 1987-04-18 | 1987-04-18 | Specific light intensity determination method with optical rotation and high-speed sugar-inspection apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87102016A CN87102016A (en) | 1988-11-02 |
| CN1007014B true CN1007014B (en) | 1990-02-28 |
Family
ID=4813727
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87102016 Expired CN1007014B (en) | 1987-04-18 | 1987-04-18 | Specific light intensity determination method with optical rotation and high-speed sugar-inspection apparatus |
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| Country | Link |
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| CN (1) | CN1007014B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7110112B2 (en) | 2002-03-06 | 2006-09-19 | Matsushita Electric Industrial Co., Ltd. | Concentration measuring instrument, concentration measuring contact apparatus, concentration measuring calculating apparatus, and concentration measuring method |
| CN104316467B (en) * | 2014-11-05 | 2017-01-25 | 上海仪电物理光学仪器有限公司 | Optical system for refraction and optical rotation integrated instrument |
| CN104458621A (en) * | 2014-12-18 | 2015-03-25 | 广州甘蔗糖业研究所 | Method for rapidly determining turbidity of sugar liquor |
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1987
- 1987-04-18 CN CN 87102016 patent/CN1007014B/en not_active Expired
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|---|---|
| CN87102016A (en) | 1988-11-02 |
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