CN102809432A - Portable photoelectric color photometer - Google Patents
Portable photoelectric color photometer Download PDFInfo
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- CN102809432A CN102809432A CN2012103036082A CN201210303608A CN102809432A CN 102809432 A CN102809432 A CN 102809432A CN 2012103036082 A CN2012103036082 A CN 2012103036082A CN 201210303608 A CN201210303608 A CN 201210303608A CN 102809432 A CN102809432 A CN 102809432A
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Abstract
The invention relates to a portable photoelectric color photometer which comprises a test sample, a measuring head and a host machine. A pre-calibration value to the color photometer is stored in the host machine. The measuring head comprises a tungsten lamp light source, a light sensing unit, a signal conditioning and analog-digital conversion unit and a shell; and the light sensing unit comprises a light gathering and guiding tube, an integrating sphere, three color sensors and an auxiliary silicon photocell. Light signals emitted by the light source pass through the light gathering and guiding tube and then are converted to be parallel light to shine on the test sample; the reflected light signals of the test sample enter the integrating sphere for diffuse reflection and then are converted to current signals by the three color sensors on the cavity wall of the integrating sphere, and after that the current signals are transmitted to the signal conditioning and analog-digital conversion unit; the auxiliary silicon photocell is arranged between the integrating sphere and the shell to collect dark current generated during the working process and to send the dark current to the signal conditioning and analog-digital conversion unit; and the signal conditioning and analog-digital conversion unit processes the received current signals and then transmits the current signals to the host machine to calculate with the pre-calibration value so as to obtain the tri-stimulus value of the test sample.
Description
Technical field
The present invention relates to a kind of colour photometer, particularly about a kind of portable photo-electric colour photometer.
Background technology
At present, mostly portable colour photometer is photoelectric integration formula structure, adopts integrating sphere as the light sensation system.When carrying out color measuring, need at first gauge head to be put on the black barrel, gauge head is transferred to main frame after collecting no colouring information, handles as the benchmark of " deceiving ", promptly transfers black; With gauge head alignment criteria blank, gauge head is transferred to main frame after collecting standard white plate information then, handles as the benchmark of " in vain ", promptly adjusts to white; And then gauge head aimed at tested article, and gather the colouring information of tested article, main frame can draw the color numerical value of tested article through the benchmark of the tested article of contrast with " white, black ".Not only colour examining step of this photoelectric integral color measurement instrument is loaded down with trivial details; Increase operating personnel's burden; Also can cause increasing error because of increasing the colour examining link; For example all can receive influence in various degree, thereby reduce the precision of colour examining because the operator is different to factors such as the measuring distance of standard white plate, angles.In addition; Present photoelectric integral color measurement instrument light sensation system and signal translating system are the discrete design; Be that the light sensation system is arranged in gauge head; Signal translating system then is arranged in main frame, and the signal transmission between light sensation system and the signal translating system is connected through shielded multiconductor cable, make gauge head and main frame size and between the position be restricted.At last,, can disturb between the various signals, influence the stability of colour examining because signal translating system and signal processing system all are arranged in main frame.
Summary of the invention
To the problems referred to above, the purpose of this invention is to provide the artificial colour examining step that gets involved of a kind of minimizing, simple in structure, can effectively improve the portable photo-electric colour photometer of colour examining automatization level and precision, stability.
For realizing above-mentioned purpose; The present invention takes following technical scheme: a kind of portable photo-electric colour photometer; It is characterized in that: it comprises the gauge head that is used to test sample; And said gauge head controlled and carry out the main frame that test result shows, said gauge head is connected with said main frame through cable; Said host memory contains the calibration value in advance to said portable photo-electric colour photometer; Said gauge head comprises tungsten light source, light sensation unit, signal condition and AD conversion unit and is used for the housing of ccontaining said tungsten light source, light sensation unit, signal condition and AD conversion unit; Said light sensation unit comprises concentration light guide tube, integrating sphere, three color sensors and auxiliary silicon photoelectric cell; The light signal that said light source sends changes directional light into behind said concentration light guide tube, be radiated on the said sample; The reflected light signal of said sample gets into and carries out diffuse reflection in the said integrating sphere; Reflected light signal after the diffuse reflection converts current signal into through said three color sensors that are arranged on the wall of said integrating sphere ball chamber, and transfers in said signal condition and the AD conversion unit; Said auxiliary silicon photoelectric cell is arranged between said integrating sphere and the housing, the dark current that produces during collecting work, and the dark current that collects is sent in said signal condition and the AD conversion unit; Said signal condition and AD conversion unit are with after the current signal amplification that receives and converting digital signal into; To the said main frame, calculate the tri-stimulus value of said sample through said cable transmission with the calibration value in advance of said host memory storage.
Said concentration light guide tube is made up of heat-protecting glass, balsaming lens and light conducting cylinder, and the heat-protecting glass that is used for the filtering infrared light is installed in the said light conducting cylinder, and said balsaming lens is formed by positive and negative combination of lenses.
Said three color sensors are formed by color filter and silicon photocell, and said three color filters receive the three kinds of color of light signals of red, green, blue after said integrating sphere diffuse reflection respectively, convert light signal into current signal by said silicon photocell.
Said signal condition and AD conversion unit comprise 4 tunnel circuit by two-stage calculation amplifier and analog to digital converter formation; Said 4 road circuit are respectively applied for and receive the current signal that said three color sensors and auxiliary silicon photoelectric cell transfer to, and said 4 road circuit are parallel-connected on the said cable; The first order of each road circuit is transported said calculation amplifier and is converted the current signal that receives into voltage signal; The said operational amplifier in the second level amplifies the voltage signal of the said operational amplifier output of previous stage in the said analog to digital converter of back input; Convert digital signal into, and import in the said main frame and calculate.
Said main frame comprises system power supply, tungsten lamp power supply, control circuit and is used for display result and the touch LCD of operation screen; Said system power supply adopts 15W, 6.5V Switching Power Supply, is said portable photo-electric colour photometer power supply; Said tungsten lamp power supply is supplied power by said system power supply, for said tungsten light source steady operation provides the crossing current power supply; Said control circuit connects signal condition and the AD conversion unit in the said gauge head, controls its work; It is the single-chip microcomputer of STM32F103RBT6 that single-chip microcomputer in the said control circuit adopts model, and said single-chip microcomputer adopts GPIO Simulation with I IC to connect said gauge head, connects said touch LCD screen through the UART serial port.
Single-chip microcomputer in the said control circuit receives the 4 way word signals that said signal condition and AD conversion unit are sent to, with in the said main frame in advance the portable photo-electric colour photometer calibration value of storage calculate, obtain the tri-stimulus value of said sample.
Said tungsten lamp power supply comprises C8051F410 single-chip microcomputer and constant-current control circuit, and the said constant-current control circuit of said C8051F410 Single-chip Controlling provides stable constant current source to said tungsten light source.
The formula that obtains said sample tri-stimulus value X, Y, Z according to calibration value and measured value in the said main frame is:
In the formula, the photronic analog to digital conversion value of said auxiliary silicon when Cm is measurement; X
m, Y
m, Z
mBe respectively the redness, green, the blue analog to digital conversion value that obtain when said three color sensors are measured; The mean value of the analog to digital conversion value that C obtains when being said auxiliary silicon photoelectric cell measurement black barrel of timing signal and standard white plate; X
b, Y
b, Z
bThe analog to digital conversion value that three silicon photocells during for the measurement black barrel in said three color sensors record; X
w, Y
w, Z
wThe analog to digital conversion value that three silicon photocells during the measurement standard blank in said three color sensors record.
The present invention is owing to take above technical scheme, and it has the following advantages: 1, the present invention is provided with tungsten light source, light sensation unit and signal condition and AD conversion unit because employing is made up of sample, gauge head and main frame in the gauge head, and it is simple in structure.And in the light sensation unit, between integrating sphere and housing, set up the auxiliary silicon photoelectric cell, all need transfer process black and that adjust to white when having saved each the measurement, therefore reduced artificial colour examining step, the mechanical disturbance when having avoided colour examining effectively got involved.2, the present invention is because the dark current when adopting the auxiliary silicon photoelectric cell to gather colour examining in the light sensation unit; Silicon photocell in this auxiliary silicon photoelectric cell and three color sensors adopts same model, the signal drift that can cause because of environment change through auxiliary silicon photoelectric cell dynamic compensation.3, the present invention is owing to be installed in signal condition and AD conversion unit and light sensation unit in the gauge head jointly; Reduced wiring quantity; Signal between gauge head and the main frame is transmitted as digital signal, has improved antijamming capability, has guaranteed colour examining precision and stability effectively.4, the present invention is owing to be provided with system power supply and tungsten lamp power supply in main frame; The tungsten lamp power supply is supplied power by system power supply; And be constant-current supply through the power source conversion that the constant-current control circuit in the tungsten lamp power supply provides system power supply; Therefore reduced the preheating time of gauge head inner product bulb separation, the stability when further having improved colour examining.5, the present invention is because main frame adopts the touch LCD screen to carry out result's demonstration and operation, and operation interface is more attractive in appearance, and operation is succinct.6, the present invention is because the 6V10W tungsten halogen lamp that tungsten light source adopts Oslan (OSRAM) to produce, and the photo-electric color measuring requires the chromatic value of Measuring Object under standard D65 light source.The colour temperature of halogen tungsten lamp is generally 3200K, approaches the D65 light source requirements.Therefore, improve the luminous stability of tungsten light source, and then improved colour examining stability and precision.7, the present invention improves the colour examining automatization level effectively owing in main frame, adopt control circuit that portable photo-electric colour photometer is controlled.The present invention can extensively use in various colour examinings place.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention;
Fig. 2 is signal condition of the present invention and AD conversion unit structural representation;
Fig. 3 is the constant-current control circuit synoptic diagram in the tungsten lamp power supply of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
As shown in Figure 1, the present invention includes the gauge head 20 that is used to test sample 10, and gauge head 20 is controlled and carried out the main frame 30 that test result shows, gauge head 20 is connected with main frame 30 through cable 40, cable 40 employing iic bus; Main frame 30 internal memories contain the calibration value in advance to portable photo-electric colour photometer.
Gauge head 20 comprises tungsten light source 21, light sensation unit 22, signal condition and AD conversion unit 23 and is used for the housing 24 of ccontaining tungsten light source 21, light sensation unit 22, signal condition and AD conversion unit 23.The optical signal transmission that light source 21 sends, is radiated on the sample 10 after the light signal that light sensation unit 22 sends light source 21 converts directional light into to light sensation unit 22; Light signal by sample 10 reflected backs converts current signal into through light sensation unit 22 again, transfers in signal condition and the AD conversion unit 23.After signal condition and AD conversion unit 23 amplify the current signal that receives and convert digital signal into; In cable 40 transfers to main frame 30; Calculate with the calibration value in advance of main frame 30 stored; Can obtain the tri-stimulus value of sample 10, thus the colouring information of quantitative acquisition sample 10.
In the foregoing description, light sensation unit 22 comprises concentration light guide tube 221, integrating sphere 222, three color sensors 223～225 and auxiliary silicon photoelectric cells 226; Wherein, integrating sphere 222 is the ball chamber of hollow, offers incidence hole, light hole and some thief holes on the ball chamber, and on the wall in ball chamber, is coated with the coating with diffuse reflective nature, for example barium sulphate.
The light signal that light source 21 sends changes directional light into behind concentration light guide tube 221, be radiated on the sample 10.The reflected light signal of sample 10 gets in the integrating sphere 222 and carries out diffuse reflection; Reflected light signal after the diffuse reflection converts current signal into through three color sensors 223～225 that are arranged on the integrating sphere 222 ball chamber walls, and transfers in signal condition and the AD conversion unit 23.Auxiliary silicon photoelectric cell 226 is arranged between integrating sphere 222 and the housing 24, the dark current that produces when being used for collecting work, and receiving optical signals not, just measurement environment and variation of temperature are three color sensor 223～225 effects of affording redress.Auxiliary silicon photoelectric cell 226 also is sent to the dark current that collects in signal condition and the AD conversion unit 23, and is transferred in the main frame 30 by signal condition and AD conversion unit 23, is used to calculate the tri-stimulus value of sample 10.Therefore, it is black and adjust to white link to have saved in the prior art the necessary accent of photo-electric colour photometer.
In the foregoing description, concentration light guide tube 221 is made up of heat-protecting glass, balsaming lens and light conducting cylinder, and the heat-protecting glass of installing in the light conducting cylinder has the effect of filtering infrared light, and balsaming lens is formed by positive and negative combination of lenses, has the effect of color difference eliminating.Light source 21 must place on the focus of balsaming lens, derives directional light to guarantee light conducting cylinder, and this directional light is exported on the sample 10, and at this moment, the light signal of sample 10 reflected backs does not comprise other veiling glares.
Among above-mentioned each embodiment; Three color sensors 223～225 are formed by color filter and silicon photocell; Three color filters receive only the three kinds of color of light signals of red, green, blue after integrating sphere 222 diffuse reflections respectively, and convert light signal into current signal by corresponding silicon photocell.Wherein, each silicon photocell and auxiliary silicon photoelectric cell 226 adopt same model.
In the foregoing description,, reduce the wiring quantity of gauge head 20 and main frame 30, signal condition and AD conversion unit 23 are arranged in the gauge head 20 in order to improve the antijamming capability of signal.Signal condition and AD conversion unit 23 comprise 4 tunnel circuit that constitute by two-stage calculation amplifier and analog to digital converter, and 4 road circuit are respectively applied for and receive the current signal that three color sensors 223～225 and auxiliary silicon photoelectric cell 226 transfer to.The first order operational amplifier of each road circuit converts the current signal that receives into voltage signal; Second level operational amplifier amplifies the voltage signal of previous stage operational amplifier output in the input analog-to-digital converter of back; Electrical signal conversion after analog to digital converter will amplify is a digital signal, and calculates in the input main frame 30.In the present embodiment, the analog to digital converter in 4 road circuit all adopts the MCP3425 of MicroChip company, and this converter is 16 ADC of Δ Σ type, the SOT23 encapsulation, and volume is little, and there is programmable gain amplifier inside; Two-stage calculation amplifier in each road circuit all adopts the rail-to-rail operational amplifier of single supply.
Wherein, signal condition in the gauge head 20 and 4 road circuit in the AD conversion unit 23 are parallel-connected on the cable 40, so only 4 lines of needs that are connected of gauge head 20 and main frame 30, be respectively power supply,, clock and data.
As shown in Figure 2, all to adopt model be the MCP6232 operational amplifier to the two-stage calculation amplifier of each road circuit in signal condition in the present embodiment and the AD conversion unit 23, and analog to digital converter adopts MCP3425.Owing to the current signal of exporting behind the light signal after 222 diffuse reflections of the reception of the silicon photocell in three color sensors 223～225 integrating sphere is faint; And the dark current signals that auxiliary silicon photoelectric cell 226 is gathered is also very faint; Therefore need carry out preposition amplification, conversion successively, input to the MCP3425 analog to digital converter after converting current signal into voltage signal through two-stage MCP6232 operational amplifier.
Among above-mentioned each embodiment, main frame 30 comprises system power supply, tungsten lamp power supply, control circuit and is used for display result and the touch LCD of operation screen.System power supply adopts 15W, 6.5V Switching Power Supply, is whole portable photo-electric colour photometer power supply of the present invention; The tungsten lamp power supply is supplied power by system power supply, for tungsten light source 21 steady operations provide the crossing current power supply; Control circuit connects signal condition and the AD conversion unit 23 in the gauge head 20, controls its work.Control circuit and touch LCD shield needed power supply and convert its inner needed power supply into through switching power source chip and low pressure difference linearity stabilized voltage supply.It is the single-chip microcomputer of STM32F103RBT6 that single-chip microcomputer in the control circuit adopts model, and it is 32 RISC single-chip microcomputers.The touch LCD screen is selected DMT80480S_01W7 cun liquid crystal display of Di Wenke skill company for use.Single-chip microcomputer adopts GPIO Simulation with I IC to connect the analog to digital converter on the gauge head 20, connects the touch LCD screen through the UART serial port.On the software design, adopt the FreeRTOS embedded OS, realize AD sampling task, touch-screen Processing tasks, liquid crystal display task and sampled result calculation task respectively, realized succinct operation interface.
In the foregoing description; The 4 way word signals that single-chip microcomputer receiving signal reason in the control circuit and AD conversion unit 23 are sent to; Calculate with the portable photo-electric colour photometer calibration value of storing in advance in the main frame 30, and then obtain the tri-stimulus value of sample 10.
Wherein, the calibration value of storage must be when portable photo-electric colour photometer of the present invention dispatches from the factory, to demarcate in the main frame 30, also can demarcate again after use a period of time.Timing signal; Use portable photo-electric colour photometer measurement standard black barrel and standard white plate respectively, and three silicon photocells in three color sensors 223～225 and auxiliary silicon photoelectric cell 226 pairing AD values (analog to digital conversion value) are X when black barrel measured in the single-chip microcomputers record in the main frame 30
b, Y
b, Z
b, C
b, measurement standard blank AD value is X
w, Y
w, Z
w, C
wAnalog to digital conversion C wherein
bAnd analog to digital conversion C
wFor auxiliary silicon photoelectric cell 226 pairing numerical value, with C
bAnd C
wThe equal postscript of making even is C.Then with the X that measures
b, Y
b, Z
b, X
w, Y
w, Z
w, C and standard white plate tristimulus values X
n, Y
n, Z
nBe saved in the main frame 30, wherein the tristimulus values of standard white plate is to provide the producer of standard white plate to provide when buying, and is to be demarcated by China National Measuring Science Research Inst..Portable photo-electric colour photometer of the present invention can calculate the actual measurement color value according to calibration value in the main frame 30 when measuring, it is following then to survey the tri-stimulus value computing formula:
In formula (1)～formula (3), C
mThe analog to digital conversion value of auxiliary silicon photoelectric cell 226 during for measurement; X
m, Y
m, Z
mBe respectively the redness, green, the blue analog to digital conversion value that obtain when three color sensors 223～225 are measured.
The present invention to the checking that experimentizes through the portable photo-electric colour photometer of demarcating,, measured once the every interval of standard white plate after 10 minutes in the start preheating in use in 5 minutes, and measurement result is as shown in table 1.
Table 1 standard white plate 30min measurement result
After testing half an hour, the standard white plate values is X
n=82.72, Y
n=87.67, Z
n=91.51, the aberration △ E of measurement standard blank is 0.14, the designing requirement that has reached.
Among above-mentioned each embodiment, it is that tungsten light source 21 provides stable constant current source that the present invention adopts the tungsten lamp power supply, can effectively guarantee the colour examining measuring stability, and can improve the stability and the antijamming capability of tungsten light source 21.The tungsten lamp power supply is based on C8051F410 single-chip microcomputer design constant-current supply, and it comprises C8051F410 single-chip microcomputer and constant-current control circuit, and adopts digital PID to realize the optimal control of constant-current supply.As shown in Figure 3, socket P1 connects tungsten light source 21 in succession, and constant-current control circuit forms FEEDBACK CONTROL through NMOS pipe Q1, sampling resistor R10 and operational amplifier U2A, and making the electric current that flows through in the tungsten light source 21 is its rated operational current.Operational amplifier U1B converts the current signal of the DA converter output of single-chip microcomputer into voltage signal, and operational amplifier U1A amplifies the voltage signal on the sampling resistor R10, and two signals relatively form FEEDBACK CONTROL NMOS pipe Q1 in the back through operational amplifier U2A.Calculating amplifier U2B then changes the AD converter that inputs to single-chip microcomputer after the voltage amplification on the sampling resistor R10; PID calculating is carried out after being compared according to sampled value and setting value by single-chip microcomputer in conversion back; The numerical value of computing generation offers constant-current control circuit through the output of DA converter the most at last.In the present embodiment, the 6V10W tungsten halogen lamp that the tungsten light source 21 in the gauge head 20 adopts Oslan (OSRAM) to produce, its rated operational current is 1.67A.Sampling resistor R10=0.2 Ω then, the power of its consumption is P=1.67 * 1.67 * 0.2=0.558 (W), so sampling resistor R10 selects the precision resistance of 1W.Adopt operational amplifier U1A, U2B that the voltage signal on the sampling resistor R10 is all amplified 5 times, and the computing parameter of PID obtain, P=1.5, I=0.9, D=0 through experience adjustments.Through evidence, through this constant-current control circuit, current fluctuation has reached 1% crossing current effect.
In sum; Above-mentioned each embodiment only is used to explain the present invention; The connection of each parts and structure all can change to some extent; On the basis of technical scheme of the present invention, all improvement and equivalents of the connection and the structure of individual component being carried out according to the principle of the invention all should not got rid of outside protection scope of the present invention.
Claims (9)
1. portable photo-electric colour photometer, it is characterized in that: it comprises the gauge head that is used to test sample, and said gauge head is controlled and carried out the main frame that test result shows, said gauge head is connected with said main frame through cable; Said host memory contains the calibration value in advance to said portable photo-electric colour photometer;
Said gauge head comprises tungsten light source, light sensation unit, signal condition and AD conversion unit and is used for the housing of ccontaining said tungsten light source, light sensation unit, signal condition and AD conversion unit; Said light sensation unit comprises concentration light guide tube, integrating sphere, three color sensors and auxiliary silicon photoelectric cell; The light signal that said light source sends changes directional light into behind said concentration light guide tube, be radiated on the said sample; The reflected light signal of said sample gets into and carries out diffuse reflection in the said integrating sphere; Reflected light signal after the diffuse reflection converts current signal into through said three color sensors that are arranged on the wall of said integrating sphere ball chamber, and transfers in said signal condition and the AD conversion unit; Said auxiliary silicon photoelectric cell is arranged between said integrating sphere and the housing, the dark current that produces during collecting work, and the dark current that collects is sent in said signal condition and the AD conversion unit; Said signal condition and AD conversion unit are with after the current signal amplification that receives and converting digital signal into; To the said main frame, calculate the tri-stimulus value of said sample through said cable transmission with the calibration value in advance of said host memory storage.
2. a kind of portable photo-electric colour photometer as claimed in claim 1; It is characterized in that: said concentration light guide tube is made up of heat-protecting glass, balsaming lens and light conducting cylinder; The heat-protecting glass that is used for the filtering infrared light is installed in the said light conducting cylinder, and said balsaming lens is formed by positive and negative combination of lenses.
3. a kind of portable photo-electric colour photometer as claimed in claim 1; It is characterized in that: said three color sensors are formed by color filter and silicon photocell; Said three color filters receive the three kinds of color of light signals of red, green, blue after said integrating sphere diffuse reflection respectively, convert light signal into current signal by said silicon photocell.
4. a kind of portable photo-electric colour photometer as claimed in claim 2; It is characterized in that: said three color sensors are formed by color filter and silicon photocell; Said three color filters receive the three kinds of color of light signals of red, green, blue after said integrating sphere diffuse reflection respectively, convert light signal into current signal by said silicon photocell.
5. like claim 1 or 2 or 3 or 4 described a kind of portable photo-electric colour photometers; It is characterized in that: said signal condition and AD conversion unit comprise 4 tunnel circuit by two-stage calculation amplifier and analog to digital converter formation; Said 4 road circuit are respectively applied for and receive the current signal that said three color sensors and auxiliary silicon photoelectric cell transfer to, and said 4 road circuit are parallel-connected on the said cable; The first order of each road circuit is transported said calculation amplifier and is converted the current signal that receives into voltage signal; The said operational amplifier in the second level amplifies the voltage signal of the said operational amplifier output of previous stage in the said analog to digital converter of back input; Convert digital signal into, and import in the said main frame and calculate.
6. like claim 1 or 2 or 3 or 4 described a kind of portable photo-electric colour photometers, it is characterized in that: said main frame comprises system power supply, tungsten lamp power supply, control circuit and is used for display result and the touch LCD of operation screen; Said system power supply adopts 15W, 6.5V Switching Power Supply, is said portable photo-electric colour photometer power supply; Said tungsten lamp power supply is supplied power by said system power supply, for said tungsten light source steady operation provides the crossing current power supply; Said control circuit connects signal condition and the AD conversion unit in the said gauge head, controls its work; It is the single-chip microcomputer of STM32F103RBT6 that single-chip microcomputer in the said control circuit adopts model, and said single-chip microcomputer adopts GPIO Simulation with I IC to connect said gauge head, connects said touch LCD screen through the UART serial port.
7. a kind of portable photo-electric colour photometer as claimed in claim 6; It is characterized in that: the single-chip microcomputer in the said control circuit receives the 4 way word signals that said signal condition and AD conversion unit are sent to; Calculate with the portable photo-electric colour photometer calibration value of storing in advance in the said main frame, obtain the tri-stimulus value of said sample.
8. a kind of portable photo-electric colour photometer of stating like claim 6; It is characterized in that: said tungsten lamp power supply comprises C8051F410 single-chip microcomputer and constant-current control circuit, and the said constant-current control circuit of said C8051F410 Single-chip Controlling provides stable constant current source to said tungsten light source.
9. a kind of portable photo-electric colour photometer of stating like claim 1 or 2 or 3 or 4 is characterized in that: the formula that obtains said sample tri-stimulus value X, Y, Z according to calibration value and measured value in the said main frame is:
In the formula, the photronic analog to digital conversion value of said auxiliary silicon when Cm is measurement; X
m, Y
m, Z
mBe respectively the redness, green, the blue analog to digital conversion value that obtain when said three color sensors are measured; The mean value of the analog to digital conversion value that C obtains when being said auxiliary silicon photoelectric cell measurement black barrel of timing signal and standard white plate; X
b, Y
b, Z
bThe analog to digital conversion value that three silicon photocells during for the measurement black barrel in said three color sensors record; X
w, Y
w, Z
wThe analog to digital conversion value that three silicon photocells during the measurement standard blank in said three color sensors record.
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| CN201210303608.2A CN102809432B (en) | 2012-08-23 | 2012-08-23 | Portable photoelectric color photometer |
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| CN201210303608.2A CN102809432B (en) | 2012-08-23 | 2012-08-23 | Portable photoelectric color photometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111721415A (en) * | 2019-03-20 | 2020-09-29 | 深圳市三恩时科技有限公司 | Color measuring instrument and method for realizing automatic compensation and accurate color measurement based on environmental change |
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| CN111721415A (en) * | 2019-03-20 | 2020-09-29 | 深圳市三恩时科技有限公司 | Color measuring instrument and method for realizing automatic compensation and accurate color measurement based on environmental change |
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