CN2153789Y

CN2153789Y - Automatic spectrum colorimeter

Info

Publication number: CN2153789Y
Application number: CN 92218087
Authority: CN
Inventors: 夏成仁
Original assignee: Engineering College Engineer Corps Chinese P L A
Current assignee: Engineering College Engineer Corps Chinese P L A
Priority date: 1992-06-12
Filing date: 1992-06-12
Publication date: 1994-01-19
Anticipated expiration: 2002-06-12

Abstract

The utility model discloses an automatic spectrum colorimeter which is composed of a light source, an integrating sphere, a monochromator, a sonde, a main-frame power supply, a data processing system, etc. The utility model is characterized in that a concave-surface holographic grating light splitting and penetrative reflection integrating sphere-typed measuring device and a negative high-voltage transfer circuit which is composed of a high-stable special purpose integrated block are adopted. The change of wavelength is amplified in power by a distributor through a single-board computer to control a stepping motor for driving a raster scan and an analogdigital converter simultaneously. The light source adopts a high-power voltage-stabilizing element and carries out temperature compensation. The utility model has the advantages of stable performance, high precision, good versatility, small size and high degree of automation and is suitable for measuring and analyzing colours in all departments.

Description

Automatic spectrum colorimeter

The utility model belongs to a kind of spectral instrument, particularly a kind of automatic spectrum colour photometer that object luminosity, colourity are measured.

At present, the domestic luminosity that is used for, the instrument that the colourity aspect detects such as " color analysis instrument " of Tianjin textile research manufacturing, it is mainly by light source, colour filter liquid, monochromator, integrating sphere, receiver, compositions such as single card microcomputer and easy rectification filter power supply, its test philosophy is: send complex light by light source and enter monochromator carry out beam split behind colour filter liquid, driving the extensible slit of penetrating in the outgoing seam back of template by stepper motor decomposes the light that enters die slot, the perforation direct irradiation of going into from integrating sphere is positioned on the sample of integrating sphere sample well then, reflected light behind the irradiation sample is injected receiver from perforation hole again after integrating sphere reflects slowly, because standard is different with absorption to same monochromatic reflection with sample, its monochromatic light intensity also changes thereupon, calculate so receiver changes different light signals into corresponding electric signal input single card microcomputer again, just can calculate each value of sample according to the difference of reflectivity.More than be nontransparent relatively solid sample, to liquid or transparent sample, this instrument integrating sphere go into perforation before be provided with a transmission groove, sample is put into the transmission groove, light is the irradiation sample earlier, enters receiver after being reflected slowly by integrating sphere again, and then calculates transmissivity.The subject matter that this instrument exists is: (1) precision is low, greater than ± 1%.Because this instrument adopts translation exit slit method to carry out beam split, thereby the beam split precision is not high, the easy rectification filter power supply that adopts of this instrument in addition, make the input voltage signal fluctuation of light source and receiver bigger, also cause the error on the measuring accuracy, adopt rectification filtering power in addition, also make machine volume increase; (2) because this instrument has only a single card microcomputer, be not with computer system,, can not store, make troubles researching and analysing so measured data can only disposablely use; (3) speed is slower, tests once about 3 minutes.(4) unstable properties, same each time of sample records data and differs greatly.

The purpose of this utility model is to provide a kind of automaticity height, measuring accuracy height and volume little, stable and reliable for performance at above-mentioned the deficiencies in the prior art, the automatic spectrum colour photometer that tests the speed fast.

The purpose of this utility model realizes by following measure, it mainly is made up of light source, colour filter body, integrating sphere, transmission frame, monochromator, stepper motor, detector, single card microcomputer and host power supply etc., wherein have sample well on the integrating sphere, light source is gone into perforation and perforation hole, each hole site and size are pressed the d/o illumination and are disposed with observation condition, and single card microcomputer joins with stepper motor and host power supply respectively; It is characterized in that host power supply also joins by negative high voltage photoelectric switching circuit and the detector that a high-power integrated regulator spare and light source join, form by the special-purpose integration module of a high stability; The colour filter body is positioned between light source and the integrating sphere, and the transmission chord position is behind the perforation hole of integrating sphere; Monochromator is made up of two completely reflecting mirrors and a concave holographic grating, concave holographic grating is driven and can be rotated with respect to light path by stepper motor, stepper motor is driven by single card microcomputer power controlling amplifying circuit, and make itself and analog to digital converter synchronous, incident focus and outgoing focus place at monochromator are provided with fixing entrance slit and exit slit respectively, monochromator is after light path is arranged at integrating sphere, and detector is positioned at the exit end of monochromator.The utility model promptly can be tested reflectivity, also can test transmissivity.With respect to nontransparent sample is to survey reflectivity, and is to survey transmissivity to transparent or fluid sample.Its test philosophy: when test during reflectivity, sample is positioned over the sample well place of integrating sphere, is defeated by the light source constant voltage by power integrated regulator spare, the trip temperature compensation of going forward side by side of selected high-precision metal film resistance by host power supply.Make degree of stability can reach ten thousand/, light source sends polychromatic light and becomes approximate D65 light source after by the colour filter body, going into perforation through integrating sphere enters in the integrating sphere slowly the reflection back and shines sample, the light that reflects from sample is gathered in the entrance slit of monochromator through lens, project again on the completely reflecting mirror, reflex on the concave holographic grating through completely reflecting mirror, this moment, stepper motor was directly driven through power amplification circuit by a controller by single card microcomputer, and its drive concave holographic grating is rotated with respect to light path, in 200～800nm, carry out length scanning, owing to the concave holographic grating decapacitation equally spaced the branch wave front produce outside the effect of diffraction, can also be quasi-optical and focus on, just can produce grating spectrum so need not add any optical system, strengthen luminous energy.Monochromatic light through the different wave length that concave holographic grating decomposites will project on another completely reflecting mirror successively, arrive on the cathode plane of detector by fixing exit slit after reflection again.Detector is owing to adopted the photoelectric switching circuit in the negative high voltage source of the special-purpose integration module composition of high stability, so as long as host power supply is supplied with the voltage of positive 15V, detector is worked under the negative high voltage of 600～900V, not only dwindled the volume of complete machine greatly, also increased stability, its degree of stability can reach 2/10000ths, has therefore improved the measuring accuracy to reflectance value.The light signal that enters detector is again through opto-electronic conversion, analog to digital conversion, interface circuit input computing machine, and standard white plate data and sample data that computing machine will store compare, and calculate the situation of change of the spectrum absolute reflectance of sample.The utility model is when surveying transmissivity, be that sample is placed in the hand basket of transmission frame, standard white plate is placed at the sample well place of integrating sphere, sample receives the slow reflected light behind integrating sphere at the perforation hole place of integrating sphere, the transmitted light of sample is calculated the situation of change of absolute transmissivity at last again through above-mentioned same program by computing machine.The whole process of the utility model is by computer operation, and computing machine also can join with plotting apparatus, printer as required, after the data computation, shows automatically, and prints various data, draws the various change curves of sample.

The utility model compared with prior art, its remarkable advantage is: (1) stable performance, the measuring accuracy height, speed is fast.Because this instrument is all taked new power supply measure to the length scanning of light source, detector and stepper motor, thereby makes stable testing, data are accurate, and precision brings up to 0.3%～0.5%, and test once only needs 0.7 minute; (2) novelty simple in structure, volume is little, in light weight.This instrument has been realized miniaturization that the ray machine electricity is combined as a whole.Single card microcomputer, light source power, power supply for step-by-step motor and negative high voltage power source by adopting integration module, are made simplification circuit simple in structure, good reliability, dwindled volume greatly, whole volume is 450 * 370 * 220mm, and weight only is 22 kilograms; (3) function is complete, and versatility is good.This instrument can be surveyed reflectivity, transmittance values, simultaneously by seven modules independently mutually in the computing machine, can calculate value of chromatism, whiteness and the yellow value degree of tristimulus values, chromaticity coordinate, five kinds of colour difference formulas, the sticking look of dyestuff and the fastness of fading grading, the various curves of spectrum (4) of drawing two kinds of coordinates are easy and simple to handle, cheap.Directly by keyboard operation, carry out man-machine conversation, the menu selection mode is finished every test, and price is no more than 20,000 yuan, is widely used in each department of colour measurement and analysis.

Concrete structure of the present utility model is provided by the following drawings and embodiment.

Accompanying drawing is the principle of work synoptic diagram of automatic spectrum colour photometer described in the utility model.

Below with reference to the accompanying drawings, be that example is further described the utility model with NGW-1 type automatic spectrum colour photometer.

With reference to the accompanying drawings, the automatic spectrum colour photometer is by light source (1), colour filter body (2), integrating sphere (3), transmission frame (4), monochromator, stepper motor (10), detector (11), single card microcomputer (12), host power supply (13) and microcomputer (14) are formed, wherein, light source (1) is the bromine tungsten filament lamp of 10V50W, voltage is supplied with the 10V DC voltage by host power supply by high-power voltage stabilizer, colour filter body (2) is the solid optical filter, what this instrument adopted is two coloured glasss, what it was close to integrating sphere (3) goes into the perforation place, the illumination observation condition of integrating sphere (3) adopts slow fire/vertical (abbreviation d/o) condition of International Commission on Illumination (CIE) regulation, and the angle between the normal of sample and the observation beam axis is 8 °.The straight warp of integrating sphere (3) is 120mm, and what have on it goes into perforation, and the total area of perforation hole and sample well is 7% of integrating sphere (3) the internal reflection total area, and arbitrary light of observation light beam and the angle between it are less than 5 °.To having slowly the sample of reflection and mirror reflection mixed reflection, adopted gloss absorption well (staple shaft) to eliminate or weaken to the influence of its direct reflection.Transmission frame (4) is positioned at outside the perforation hole of integrating sphere (3), and a hand basket of being made by aluminium alloy is arranged in it, and this hand basket can move on one side along the transmission frame when surveying reflectivity.Monochromator is made up of entrance slit (5), exit slit (9), total reflective mirror (6,8) and concave holographic grating.The entrance slit of monochromator (5) width can be 0.3～0.5mm, the width of exit slit (9) is 0.25～0.28mm, present embodiment is taken into penetrates the wide 0.5mm of slit (5), exit slit (9) is wide to be 0.25mm, distinguishable pair of mercury line, they lay respectively on the incident focus and outgoing focus of monochromator, and the wavelength coverage of concave holographic grating (7) is 200～800nm, optical resolution≤0.6nm, area of raster 30 * 30mm ², dimension 1200L/mm, linear dispersion 7nm/mm reciprocal, parasitic light≤10 ^-3, concave holographic grating (7) also has quasi-optical and focussing force except that being used for the beam split in monochromator, and it is driven to rotate with respect to light path by stepper motor (10) carries out length scanning.Stepper motor (10) provides 12V DC voltage by host power supply (13), and synchronous through power amplification control step motor (10) and analog to digital converter by controller by single card microcomputer (12).Detector (11) is a day R955 photomultiplier, the detection wavelength coverage is 200～800nm, the circuit of forming by high stability negative high voltage integration module, supply with the negative high voltage of photomultiplier 600～900V, negative high voltage is supplied with positive 15V voltage by host power supply (13) and is got final product, single card microcomputer (12) is TP801A, provide positive 5V DC voltage by host power supply (13), single card microcomputer (12) is connected by an interface circuit with microcomputer (14), and microcomputer (14) also can join with plotting apparatus (15) and printer (16) as required.

Claims

1, a kind of automatic spectrum colour photometer that is used for luminosity and colour measurement mainly is made up of light source [1], colour filter body [2], integrating sphere [3], transmission frame [4], monochromator, stepper motor [10], detector [11], single card microcomputer [12] and host power supply [13] etc.; Wherein have sample well on the integrating sphere [3], light source is gone into perforation and perforation hole, each hole site and size press d/o illumination and observation condition disposal, single card microcomputer [12] joins with stepper motor [10] and host power supply [13] respectively; It is characterized in that host power supply [13] also joins by negative high voltage photoelectric switching circuit and the detector [11] that a high-power integrated regulator spare and light source [1] join, form by the special-purpose integration module of a high stability; Colour filter body [2] is positioned between light source [1] and the integrating sphere [3], after transmission frame [4] is positioned at the perforation hole of integrating sphere [3]; Monochromator is made up of two completely reflecting mirrors [6,8] and a concave holographic grating [7], concave holographic grating [7] is driven and can be rotated with respect to light path by stepper motor [10], stepper motor [10] is driven by single card microcomputer [2] power controlling amplifying circuit, and make itself and analog to digital converter synchronous, incident focus and outgoing focus place at monochromator are provided with fixing entrance slit [5] and exit slit [9] respectively, and monochromator is arranged at integrating sphere [3] afterwards along light path; Detector [11] is positioned at the exit end of monochromator.

2, automatic spectrum colour photometer according to claim 1 is characterized in that the colour filter body (2) between light source (1) and the integrating sphere (3) is the solid optical filter.

3, automatic spectrum colour photometer according to claim 1 and 2 is characterized in that the width of the entrance slit (5) of monochromator is 0.3～0.5mm, and the width of exit slit (9) is 0.25～0.28mm.