CN203455076U - Optical path automatic correction colorimeter - Google Patents
Optical path automatic correction colorimeter Download PDFInfo
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- CN203455076U CN203455076U CN201320442462.XU CN201320442462U CN203455076U CN 203455076 U CN203455076 U CN 203455076U CN 201320442462 U CN201320442462 U CN 201320442462U CN 203455076 U CN203455076 U CN 203455076U
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Abstract
The utility model discloses an optical path automatic correction colorimeter. The colorimeter comprises a luminescence light source, a colorimetric ware, an opposite-irradiation light receiver and a data processor. A light signal sent by the luminescence light source is output to a receiving end of the opposite-irradiation light receiver via the colorimetric ware; an output end of the opposite-irradiation light receiver is in communication connection with an input end of the data processor; the colorimeter also comprises a compensation light receiver directly receiving the light signal sent by the luminescence light source; the compensation light receiver comprises a vertical type silicon photocell and a two-stage amplifier; and the vertical type silicon photocell and the two-stage amplifier are connected in series and then connected with the data processor. According to the utility model, precision and accuracy of measurement are improved, attenuation of emitted light is prevented, and automatic correction for the luminescence light source is achieved.
Description
Technical field
The present invention relates to a kind of colorimeter, in particular, relate to a kind of colorimeter of light path automatic calibration.
Background technology
Beer-Lambert law is the quantitative basis of absorption photometry, colorimetric analysis and photoelectric colorimetry, and law shows that the absorbed amount of light is proportional to the molecule number that produces light absorption in light path.Its specific descriptions are as follows: suppose that a beam intensity is that collimated monochromatic ligth (incident light) vertical irradiation of I0 is in isotropic even absorbing medium surface, after the absorption layer that is l by thickness (light path), due to the absorption of particle in absorption layer to light, the strength decreased of this bundle incident light, to It, is called transmitted intensity.Material is directly proportional to the size of all extinction particle sectional areas to the capacity of water of light absorption.Suppose that intensity is after the incident illumination of I is mapped on thin-layered medium, light intensity has weakened dI, dI is that light is absorbed measuring of degree in thin-layered medium, be directly proportional to total sectional area dS and the incident light intensity of extinction particle in thin layer, through calculating the absorbance A=K*c*l that can obtain thin-layered medium, wherein, K is scale-up factor, can be absorption coefficient or molar absorption coefficient, relevant with the character of absorbing material and the wavelength X of incident light, irrelevant with incident light intensity; L is the thickness of absorbing medium; C is the concentration of extinction material.Beer law shows that its absorbance A is directly proportional to concentration c and the absorber thickness l of extinction material when the vertical extinction material by a certain even non-scattering of a branch of collimated monochromatic ligth.When the thickness l of absorption layer is definite value, the variation of absorbance A is only directly proportional to the concentration c of extinction material, Beer law is the philosophy of light absorption, is applicable to all electromagnetic radiation and all extinction materials, comprises gas, solid, liquid, molecule, atom and ion.
From Bill's Lambert law, we will measure absorbance A or the transmittance T of extinction material, must know two variablees, be incident intensity I0 and transmitted intensity It, measuring the absorbance A of extinction material or the colorimeter of transmittance T is at present all by transmitting illuminant, cuvette and correlation optical receiver are that taproot forms, when cuvette is sky, correlation optical receiver place obtains light intensity value and is equivalent to incident intensity value I0, in cuvette, pack into after solution, the value It that the value that correlation optical receiver is measured is transmitted light, thus, according to Beer-Lambert law, can obtain measuring absorbance A or the transmittance T of extinction material.But, current colorimeter is unidirectional test, light source adopts the light emitting diode of small size, the light efficiency of light emitting diode and heating are negative characteristic relation, owing to there is no self-correcting control circuit for light source and compensating light receiver, and only has correlation optical receiver, therefore can only be according to the temperature light decay characteristic of luminotron, estimate colorimetric properties, cause colourity test inaccurate, lack adaptation function, often the illumination of luminotron tolerance has changed when a lot, correlation light still calculates colorimetric properties according to invariant, and test result is caused to very large mistake.
Summary of the invention
Technical matters to be solved by this invention is, overcomes the shortcoming of prior art, and a kind of colorimeter that overcomes utilizing emitted light decay, improves the light path automatic calibration of test colourity accuracy is provided.
In order to solve above technical matters, the invention provides a kind of colorimeter of light path automatic calibration, comprise illuminating source, cuvette, correlation optical receiver and data processor, the light signal that described illuminating source sends is input to the receiving end of described correlation optical receiver by described cuvette, the output terminal of described correlation optical receiver and the communication connection of the input end of described data processor, also comprise the light source self-correction control module being connected with data processor, described light source self-correction control module comprises STM32F103RB chip and at least one road current-limiting circuit that produces pulse width modulating signal, described current-limiting circuit comprises current-limiting resistance and switching tube, the PWM pin of described STM32F103RB sheet is connected with described switching tube, described switching tube is connected with described illuminating source, described illuminating source is connected with power supply with after described current-limiting resistance series connection.
Being further defined to of the technical program, described illuminating source comprises 4 light emitting diodes, described light source self-correction control module comprises the 4 tunnel current-limiting circuits that are connected with 4 PWM pins of STM32F103RB chip respectively, switching tube in each road current-limiting circuit is connected with one of them light emitting diode, above-mentioned light emitting diode is connected with power supply after the series connection of the circuit in the current-limiting circuit of road therewith, the illumination brightness of 4 light emitting diodes of STM32F103RB chip controls, and by 4 light emitting diodes of switch controlled of 4 tunnel current-limiting circuits.
Further, the compensating light receiver that also comprises the light signal that direct reception illuminating source sends, described compensating light receiver comprises vertical type silicon photocell and two-stage amplifier, and described vertical type silicon photocell is connected with data processor with after described two-stage amplifier series connection.
Further, described cuvette is two-way light type quartz colorimetric utensil or four-way light type quartz colorimetric utensil.
Further, described correlation optical receiver is BPW69A type silicon photocell.
Further, between described correlation optical receiver and described data processor, operational amplifier is set.
Further, between described correlation optical receiver and described data processor, AD collector is set.
The invention has the beneficial effects as follows: the colorimeter that the invention provides a kind of light path automatic calibration, with compensating light receiver, when utilizing emitted light has subtle change, compensating light receiver just can trace into, thereby variable quantity is delivered to data processor as important parameter, makes data processor can obtain accurately radiative variable quantity, contrast with the quantities received of correlation light, perfectly calculate the chromatic value of solution in cuvette, improve precision and the accuracy measured; Simultaneously, colorimeter of the present invention is with light source self-correction control module, according to the Strength Changes of the light signal of illuminating source, the center carrier frequencies that adopts 10KHZ, regulates with millesimal stepping, obtains good dynamic range, current stability after adjusting is good, to illuminating source, overcome utilizing emitted light decay, realize the automatic calibration to illuminating source; Measuring accuracy of the present invention is high, can catch in time the subtle change of the illumination of luminophor, automatically easy to adjust, can directly apply to existing colorimeter, and repacking is convenient, and cost is low.
Accompanying drawing explanation
Fig. 1 is the structural framing figure of the colorimeter of a kind of light path automatic calibration of the present invention;
Fig. 2 is the circuit diagram of compensating light receiver of the present invention;
Fig. 3 is the circuit diagram of light source self-correction control module of the present invention.
Embodiment
The colorimeter of a kind of light path automatic calibration that the present embodiment provides, to reequip on the basis of original colorimeter, original colorimeter comprises illuminating source, cuvette, correlation optical receiver and data processor, the light signal that illuminating source sends is input to the receiving end of correlation optical receiver by cuvette, the output terminal of correlation optical receiver and the communication connection of the input end of data processor.When carrying out colour measurement, in cuvette, inject solution, connect the power supply of illuminating source, the light signal sending is injected the solution in cuvette, after solution filter, by correlation optical receiver, received, and import into data processor, data processor is analyzed the light source receiving, and obtains the chromatic value of solution in cuvette.
The present embodiment is reequiped above-mentioned colorimeter, has increased compensating light receiver and light source self-correction control module, and the element in above-mentioned colorimeter is optimized.
What the element of above-mentioned colorimeter was done is optimized for: illuminating source adopts the light emitting diode of the different colours of four high stabilities, is respectively blue LED, and emission wavelength is 460--470nm; Green LED, emission wavelength is 510--530nm; Yellow light-emitting diode, emission wavelength is 580-595nm; Red light emitting diodes, emission wavelength is 615--630nm.Above-mentioned four light emitting diodes all drive luminous by power amplification circuit, during work, only have a lumination of light emitting diode, and the light source of different wave length is provided, and conveniently measure and verify.
Correlation optical receiver and illuminating source are arranged at respectively the both sides of cuvette, receive the light signal through filtering.Adopt BPW69A type silicon photocell, it has good Electrophotosensitive in the dynamic range of 400nm-900nm.Cuvette adopts two-way light type quartz colorimetric utensil or four-way light type quartz colorimetric utensil, in order to measurement device solution.Data processor adopts 32 processor of single chip computer that ARM is core.
Architectural feature based on above-mentioned colorimeter, is described further structure and the principle of work of compensating light receiver and light source self-correction control module below.
Compensating light receiver and illuminating source are arranged at the homonymy of cuvette, directly receive the light signal that illuminating source sends.Compensating light receiver comprises vertical type silicon photocell and two-stage amplifier, described vertical type silicon photocell is connected with data processor with after described two-stage amplifier series connection, its circuit diagram as shown in Figure 2, after the operational amplifier series connection that vertical type osmanthus photoelectric cell D5 forms with two-stage TLC2252, be connected with data processor, as light emitting diode D1, D2, when D3 or D4 are luminous, utilizing emitted light can shine on vertical type silicon photocell D5, vertical type silicon photocell D5 receiving optical signals amplifies by two-stage, formation voltage is proportional to the AD1 signal of illuminance, AD1 is sent into data processor to be processed.Acting as of the AD1 signal that is proportional to illuminance that compensating light receiver obtains: be 1. that while injecting testing liquid, AD1 signal is set up corresponding relation with the optical signal transmissive receiving through correlation optical receiver in cuvette; When injecting testing liquid starting the measurement of colourity in cuvette, data processor contrasts according to real-time AD1 signal and initial AD1 signal, if signal is decayed, can to illuminating source, proofread and correct by light path self-correcting circuit, in fact self-correcting control circuit for light source and compensating light acceptor circuit form a complete supervisory circuit, its object is exactly in order to maintain the stability of utilizing emitted light illumination, prevents the impact of the photo-labile that light causes due to hot effect.
The input end of light source self-correction control module is connected with data processor, and its output terminal is connected with illuminating source, controls the luminous intensity of illuminating source, realizes the automatic calibration of illuminating source.Light source self-correction control module comprises STM32F103RB chip and at least one road current-limiting circuit that produces pulse width modulating signal, described current-limiting circuit comprises current-limiting resistance and switching tube, the PWM pin of described STM32F103RB chip is connected with described switching tube, described switching tube is connected with described illuminating source, and described illuminating source is connected with power supply with after described current-limiting resistance series connection.In the present embodiment, illuminating source comprises 4 light emitting diodes, described light source self-correction control module comprises the 4 tunnel current-limiting circuits that are connected with 4 PWM pins of STM32F103RB chip respectively, switching tube in each road current-limiting circuit is connected with one of them light emitting diode, and above-mentioned light emitting diode is connected with power supply after the series connection of the circuit in the current-limiting circuit of road therewith.The circuit of the light source self-correction control module of the present embodiment as shown in Figure 3, first via current-limiting circuit is connected with the pin PWM4 of STM32F103RB chip, comprise switching tube Q1 and current-limiting resistance R1 and resistance R 2, after 2 series connection of the pin PWM4 of STM32F103RB chip and resistance R, be connected with switching tube Q1, switching tube Q1 be connected with green LED D1 and connect with current-limiting resistance R1 after switch on power; The second tunnel current-limiting circuit is connected with the pin PWM1 of STM32F103RB chip, comprise switching tube Q2 and current-limiting resistance R3 and resistance R 4, after 4 series connection of the pin PWM1 of STM32F103RB chip and resistance R, be connected with switching tube Q2, switching tube Q2 be connected with blue LED D2 and connect with current-limiting resistance R3 after switch on power; Third Road current-limiting circuit is connected with the pin PWM3 of STM32F103RB chip, comprise switching tube Q3 and current-limiting resistance R5 and resistance R 6, after 6 series connection of the pin PWM3 of STM32F103RB chip and resistance R, be connected with switching tube Q3, open the light manage Q3 be connected with red light emitting diodes D3 and connect with current-limiting resistance R5 after switch on power; Si road current-limiting circuit is connected with the pin PWM2 of STM32F103RB chip, comprise switching tube Q4 and current-limiting resistance R7 and resistance R 8, after 8 series connection of the pin PWM2 of STM32F103RB chip and resistance R, be connected with switching tube Q4, switching tube Q4 be connected with yellow light-emitting diode D4 and connect with current-limiting resistance R7 after switch on power.4 PWM passages of data processor controlled STM32F103RB chip only allow a passage output pwm signal at every turn, control one of them lumination of light emitting diode, realize the constant wavelength of illuminating source, meanwhile, are convenient to the transposing of light sources with different wavelengths.Light source self-correction control module is by four PWM passage output pwm signals, and each passage, by current-limiting resistance, is added to voltage on light emitting diode, by the switch of each switching tube of PWM signal controlling.The principle of work of light source self-correction control module is: the mean value of operating voltage
because
be the dutycycle of PWM, so the mean value of operating voltage
it is exactly the product of dutycycle and high level voltage.Theoretically, because the operating voltage of we VCC is 5V, pressure drop when by current-limiting resistance conducting is 2V, the dutycycle of pwm signal from 0 to 1000/1000ths, each stepping is per mille, so the voltage that can regulate is supply voltage 3/1000ths at every turn, degree of regulation is very little for light emitting diode, can complete the preliminary brightness self-correcting of light emitting diode, simultaneously light source self-correction control module can also and compensating light receiver form PID(proportion integration differentiation) automatic control system.
In addition, operational amplifier and AD collector are set between the correlation optical receiver of the colorimeter of light path automatic calibration of the present invention and data processor.Operational amplifier adopts take TLC2252 as core, coordinates with resistance capacitance, forms the circuits sense equipment that light signal is amplified.AD collector TL431A is benchmark, with 12 AD, gathers.
The colorimeter of above-mentioned light path automatic calibration comprises that to the concrete measuring method of colourity the solution in contrast colors ware carries out step and the automatic calibration step of colorimetric analysis, specifically carries out as follows:
In F1, cuvette, inject distilled water, open illuminating source and correlation optical receiver, the light intensity that now correlation optical receiver receives is incident intensity, and correlation optical receiver transfers to data processor by incident intensity.
When gathering incident intensity, the intensity of light path is carried out to automatic calibration, method is: data processor judges incident intensity, if incident intensity is less than preset value, control the STM32F103RB chip of light source self-correction control module, by the center carrier frequencies signal of PWM pin output 10KHZ, current-limiting circuit is added to voltage on light emitting diode by current-limiting resistance, the carrier frequency signaling of STM32F103RB chip output improves the voltage of light emitting diode both sides with millesimal stepping, until the incident intensity that data processor receives equals preset value.
In addition, compensating light receiver receives light source initial strength, and initial strength is sent to data processor, and data processor is set up incidence relation storage by light source initial strength and incident intensity.
In F2, cuvette, inject testing liquid, open illuminating source and correlation optical receiver, the light intensity that now correlation optical receiver receives is transmitted intensity, and correlation optical receiver transfers to data processor by transmitted intensity.
Compensating light receiver receives light source Real-time intensity, and light source Real-time intensity is sent to data processor, data processor is by the light source initial strength contrast of the light source Real-time intensity receiving and storage, if light source Real-time intensity is lower than light source initial strength, carry out automatic calibration step, be specially: the STM32F103RB chip of controlling light source self-correction control module, by the center carrier frequencies signal of PWM pin output 10KHZ, current-limiting circuit is added to voltage on light emitting diode by current-limiting resistance, the carrier frequency signaling of STM32F103RB chip output improves the voltage of light emitting diode both sides with millesimal stepping, until the light source Real-time intensity that data processor receives equals light source initial strength.
F3, data processor are set up the proportionate relationship of incident intensity and transmitted intensity, according to Bill's Lambert law, light signal are processed, and extrapolate the chromatic value of solution in cuvette.
F4, complete after a colour measurement, the STM32F103RB chip of data processor controlled light source self-correction control module, by opening and closure of PWM pin gauge tap pipe, the illuminating source of changing another kind of wavelength carries out luminous, repeated execution of steps F1, F2, F3, carry out new colour measurement.
In the present embodiment, in step F 1, use distilled water to demarcate colorimeter, under four kinds of colourities, distilled water is demarcated as to T=It/I0=100%.In the present embodiment, configuration liquor potassic permanganate has carried out measuring (with identical cuvette), and the data that obtain penetrability T are as follows:
According to Bill's Lambert law, can obtain the colourity A=lg of liquor potassic permanganate (I0/It)=lg (1/T)=K*c*l; Proportional coefficient K=[lg (1/T)]/[c*l]; Because use identical cuvette, there is identical light path, can be used as Yi Ge light path unit.And the volumetric molar concentration of liquor potassic permanganate is the integral multiple of 0.001MOL/L, can be using 0.001MOL/L as Yi Ge unit, therefore, Proportional coefficient K=[lg (1/T)]/[N*0.001MOL/L* light path unit], by obtaining corresponding K value for [unit is: 1/ (0.001mol/l* light path unit)] to the processing of above data.
By above data, can find out that ruddiness is 0.15 to the K value of liquor potassic permanganate, gold-tinted is 0.30 to the K value of liquor potassic permanganate, and Bill's Lambert law is told us: K is scale-up factor, can be absorption coefficient or molar absorption coefficient.It is relevant with the character of absorbing material and the wavelength X of incident light.Irrelevant with incident light intensity.We see that working as same substance (potassium permanganate) is different to their K value of the incident light of different wave length [red (615--630nm), yellow (580-595nm)], is respectively 0.15 and 0.30.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (7)
1. the colorimeter of a light path automatic calibration, comprise illuminating source, cuvette, correlation optical receiver and data processor, the light signal that described illuminating source sends is input to the receiving end of described correlation optical receiver by described cuvette, the output terminal of described correlation optical receiver and the communication connection of the input end of described data processor, it is characterized in that, also comprise the light source self-correction control module being connected with data processor, described light source self-correction control module comprises STM32F103RB chip and at least one road current-limiting circuit that produces pulse width modulating signal, described current-limiting circuit comprises current-limiting resistance and switching tube, the PWM pin of described STM32F103RB sheet is connected with described switching tube, described switching tube is connected with described illuminating source, described illuminating source is connected with power supply with after described current-limiting resistance series connection.
2. the colorimeter of a kind of light path automatic calibration according to claim 1, it is characterized in that, described illuminating source comprises 4 light emitting diodes, described light source self-correction control module comprises the 4 tunnel current-limiting circuits that are connected with 4 PWM pins of STM32F103RB chip respectively, switching tube in each road current-limiting circuit is connected with one of them light emitting diode, and above-mentioned light emitting diode is connected with power supply after the series connection of the circuit in the current-limiting circuit of road therewith.
3. the colorimeter of a kind of light path automatic calibration according to claim 1, it is characterized in that, the compensating light receiver that also comprises the light signal that direct reception illuminating source sends, described compensating light receiver comprises vertical type silicon photocell and two-stage amplifier, and described vertical type silicon photocell is connected with data processor with after described two-stage amplifier series connection.
4. according to the colorimeter of a kind of light path automatic calibration described in the arbitrary claim of claim 1-3, it is characterized in that, described cuvette is two-way light type quartz colorimetric utensil or four-way light type quartz colorimetric utensil.
5. according to the colorimeter of a kind of light path automatic calibration described in the arbitrary claim of claim 1-3, it is characterized in that, described correlation optical receiver is BPW69A type silicon photocell.
6. according to the colorimeter of a kind of light path automatic calibration described in the arbitrary claim of claim 1-3, it is characterized in that, between described correlation optical receiver and described data processor, operational amplifier is set.
7. according to the colorimeter of a kind of light path automatic calibration described in the arbitrary claim of claim 1-3, it is characterized in that, between described correlation optical receiver and described data processor, AD collector is set.
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| CN201320442462.XU CN203455076U (en) | 2013-07-24 | 2013-07-24 | Optical path automatic correction colorimeter |
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| CN201320442462.XU CN203455076U (en) | 2013-07-24 | 2013-07-24 | Optical path automatic correction colorimeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411678A (en) * | 2013-07-24 | 2013-11-27 | 江苏苏威尔科技有限公司 | Colorimeter and chrominance measurement method for automatically correcting light path |
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2013
- 2013-07-24 CN CN201320442462.XU patent/CN203455076U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411678A (en) * | 2013-07-24 | 2013-11-27 | 江苏苏威尔科技有限公司 | Colorimeter and chrominance measurement method for automatically correcting light path |
| CN103411678B (en) * | 2013-07-24 | 2015-11-18 | 江苏苏威尔科技有限公司 | A kind of colourity of light path automatic calibration takes into account colour measurement method |
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