JPH03130629A - Measuring method for color of fluorescent substance - Google Patents

Abstract

PURPOSE:To make it possible to perform the same measurement as measurement using a Luther filter in computation even if the Luther filter is not used by obtaining the tristimulus values of a substance to be measured by computation based on the spectroscopic tristimulus values which are measured through individual filters. CONSTITUTION:A plurality of (n) kinds of filters having spectral transmittances gammax, i<lambda>, gammay, i<lambda>, gammaz and i<lambda> are provided between a substance to be measured 4 and a photodetector system 7. The spectral response of the light from the photodetector without a color filter 6 is made to be Sr<lambda>. Coefficients ax, i, ay, i, az and i are selected so that Sx<lambda>, Sy<lambda>, and Sz<lambda> obtained based on the expression I satisfy the Luther conditions. Thus the virtual photodetector system 7 is formed. Then, the spectroscopic tristimulus values Ximu, Yimu and Zimu which are obtained by the measurements through the individual filters 6 are synthesized based on the expression II. The synthesized tristimulus values Xmu, Ymu and Zmu obtained in the virtual photodetector system are used, and the tristimulus values of the substance to be measured 4 under the projected light having arbitrary relative spectral distribution Smu are obtained based on the expression III.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for measuring the color of a fluorescent object, and more particularly, the present invention relates to a method for measuring the color of a fluorescent object, and more particularly, the present invention relates to a method for measuring the color of a fluorescent object, and more specifically, the present invention relates to a method for measuring the color of a fluorescent object, and more particularly, the present invention relates to a method for measuring the color of a fluorescent object, and more particularly, the present invention relates to a method for measuring the color of a fluorescent object. This method measures the colors of fluorescent objects and expresses them using tristimulus values.

(Prior Art) Object color (hereinafter referred to as "fluorescent sample") of an object (sample) to be measured (hereinafter referred to as fluorescent sample) containing a fluorescent dye or fluorescent pigment.

The spectral radiance factor (apparent spectral reflectance of the sample relative to a commonly used standard white surface) differs greatly from the object color of non-fluorescent dyes, as the spectral radiance factor (apparent spectral reflectance of the sample relative to a commonly used standard white surface) depends on the illumination light and the type of receiver system. Therefore, it is generally not possible to calculate the object color under arbitrary illumination light only from the spectral radiance factor measured using a single illumination light or a light receiver system.

For this reason, various methods for measuring fluorescent object colors have been proposed in the past, and the six typical methods for measuring fluorescent object colors are the six types specified in the Japanese Industrial Standard JIS Z 8717 (methods for measuring fluorescent object colors). There is a method. Further, as a general method for measuring the color of a non-fluorescent object, there is a method defined in 1 Japanese Industrial Standards JIS Z 8722 (Method for Measuring Object Color). Various types of fluorescent object color measuring devices and object color measuring devices have been manufactured and used based on the measurement principles of these methods, but the optical systems of each of the fluorescent object color measuring devices and object color measuring devices are common. Due to the large number of parts, the conventional fluorescent object measuring device is a repurposed object color measuring device or
It has a modified structure.

In order to determine the fluorescent object color under arbitrary illumination light, one light source fluorescence separation method or two light source fluorescence separation method is suitable among the six types of measurement methods specified in Japanese Industrial Standard JIS Z 8717. These measurement methods are based on illumination conditions (hereinafter referred to as
(referred to as white light illumination), and measurement conditions in which light from the sample surface is guided to a receiver via a monochromator and the output of the receiver is measured for each set wavelength of the monochromator (hereinafter referred to as spectroscopic observation). Mainly uses white light illumination and spectroscopic W4 measurements. Furthermore, in sub-measurements, there are two illumination conditions: one in which the sample surface is irradiated with light from a light source via a monochromator (hereinafter referred to as monochromatic illumination); Observation conditions that lead to the receiver through the system or the integrating sphere (hereinafter referred to as non-spectral observation)
Object color measurement methods using monochromatic illumination and non-spectral observation methods are required.

(Problem to be solved by the invention) These methods are based on white light illumination/spectral M measurement and monochromatic light illumination/
Since the spectral radiance ratio must be measured under two conditions (non-spectral M measurement), that is, using two types of object color measuring devices, there is a drawback that the measurement is complicated. In particular, the one-light source fluorescence separation method is a simple measurement method that includes various assumptions in order to simplify the measurement method.

White light illumination/spectroscopy i! ! For illumination light whose spectral distribution is very different from the illumination light used for time measurement, there is a drawback that the error in estimating the fluorescent object color becomes large. This problem also applies to the remaining four types of measurement methods specified in the Japanese Industrial Standard JIS Z 8717.

In addition, as a typical measurement method, there is a two-spectrometer method [References: Minato, M., Nanjo and
Y, Nayatani.

Colorimetry and its Acc
uracy Ln the Measurement
of Fluorsscent Materi
als dy Tw.

Monochro+mator Method Co1
or Res, Appl,, Vol.

10, Nα2. pp. 84-91 (1985)]. The two spectrometer method uses two spectrometers, one for monochromatic illumination and one for spectroscopic observation.
This method uses two monochromators (spectroscopes), and its measurement principle has the advantage of accurately estimating the color of a fluorescent object under any illumination light. However, this method has the problem that the conventional object color measuring device or fluorescent object color measuring device cannot be used as a substitute because the wavelength of the monochromator must be changed for each of monochromatic illumination and spectroscopic observation. In order to repurpose the conventional equipment, it is necessary to use a router filter on the observation side of the monochromatic illumination/non-spectroscopic &f type equipment.However, it is not a good idea to actually make a router filter as it is quite difficult. do not have.

Therefore, an object of the present invention is to provide a method for measuring fluorescent object color without using a router filter and requiring a small number of measurement points.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a method for measuring the object color of an object to be measured by illuminating the object to be measured with monochromatic light and observing the reflected light from the object using a receiver system. Multiple types of filters are interposed between the measurement object and the receiver system, the spectral responsivity of the receiver system for each filter is determined, and the coefficients are set so that these spectral responsivity satisfies the router conditions. Select to configure a virtual receiver system,
Based on the spectral tristimulus values measured and determined under each filter, the combined spectral tristimulus values calculated under a virtual receiver system are used to calculate the illumination light. This method calculates the tristimulus values of the object under test.

(Function) Even without using a router filter, a virtual receiver system is constructed by determining coefficients so that the calculation conditions are the same as when using a router filter, and calculations are made from the spectral tristimulus values measured under each filter. If the tristimulus values of the object to be measured are determined by , it is possible to perform the same calculation as using a router filter without actually using the router filter.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of an optical system showing an embodiment of the fluorescent object color measuring device according to the present invention. In Figure 1, drawing number 1 is a light source such as a halogen bulb or deuterium lamp, 2 is a monochromator, 3 is a mounting frame for the object to be measured, and 4 is the object to be measured (
5 represents a color filter mounting frame, 6 represents a color filter, and 7 represents a light receiver. The above parts 1 to 7 are attached to a cover 8, and the fluorescent object color measuring device is assembled. It consists of Other than the color filter mounting frame 5 and the color filter 6, the optical structure is the same as that of a normal object color measuring device using monochromatic illumination and non-spectral 11 measurement method.

First, the measurement principle related to this measuring device will be described.

Relative color stimulation function S of a fluorescent sample under arbitrary illumination light measured with white light illumination and spectroscopic observation that are equivalent to the illumination and observation conditions of the conventional one-light source fluorescence separation method and two-light source fluorescence separation method
(λ) βt, 8(λ) is expressed by the following formula.

S(λ)βtts(λ)=S(λ)β. (λ)+ΣS(
μ)βf(μ,λ)Δμ ■μ Here, S(λ) is the relative spectral distribution of the sample surface illumination light, βt
, scλ) is the total spectral radiance factor, β, which depends on the type of illumination light S. (λ) is the reflected spectral radiance factor of the reflected component of the sample, βf (μ, λ) is the radiance factor of the fluorescent component, which represents the ratio of fluorescence with wavelength λ to excitation light with wavelength μ, λ and μ
represents the wavelength, and Δμ represents the wavelength interval of integration (Σ).

In the two-spectrometer method, βf(μ, λ) and β are measured by changing the excitation wavelength μ and fluorescence wavelength λ, respectively. (λ). In addition, in the one-light source fluorescence separation method and the two-light source fluorescence separation method, βf (μ, λ) is the relative spectral distribution F of the fluorescence component.
(λ) and the relative external fluorescence radiation efficiency Qa (μ), the error in estimating the fluorescent object color is large for illumination light whose spectral distribution is very different from the sample surface illumination light used for measurement. Become.

Reflection spectral radiance factor β. (λ) can also be expressed as a linear equation.

β. (μ, λ) = β. (λ) When μ=λ = 0
When μ≠λ ■ Substitute this into equation ■, S(λ)βt+9(λ)=ΣS(μ)[β. (μ, λ)
+βf(μ,λ)Δμμ =ΣS(μ)βt(μ,λ)Δμ (3)μ However.

βt(μ, λ) = β. (μ, λ) + βf(μ, λ)
(b).

Therefore, based on the 2-degree visual field < tristimulus values x, y of the xyz color system
, z is 2〇 and Japanese Industrial Standard JIS Z 8701 (X
YZ color system and X engineering. Y□. Z□. The isochromatic distance matrix (λ) and y (λ) specified in the color display method (color display method using color system).

Using 7(λ) X=ΣS(λ)βt, 8(λ)ma(λ)Δλp Y=ΣS(λ)βt, 3(λ)y(λ)Δλλ Z=ΣS(λ)βtps(λ)Ding(λ)Δλλ It can be calculated by

Now, the tristimulus value for unit irradiation energy monochromatic light [s (μ) = 1 unit] is 1 minute tristimulus value X (μ), Y (μ).

, Yi(μ), then from equation ■X(μ)=
Σβt (μ, λ) Ma (μ) Δλλ Y (μ) = Σβt (μ, λ) y (μ) Δλλ , Yi (μ) = Σβt (μ, λ) τ (μ) Δλλ ■, and 2 is X; ΣS(μ)X(μ)Δμ μ Y=ΣS(μ)Y(μ)Δμ μ Z=ΣS(μ), Yi(μ)Δμ
■Represented by μ.

Therefore, if it is possible to directly measure the spectral tristimulus values represented by 2〇, it can be seen that the color of a fluorescent object under any illumination light can be determined from equation ①. In addition, X construction is based on a 10 degree field of view. Yl
, zi. When calculating, use the color matching function i(
X engineering instead of λ), y(λ), and 7(λ). Yl, Z
Engineering. Values of color matching functions in the color system xta (λ), yll
Calculate using l(λ) #Z10(λ).

To achieve this, an illumination system (light source 1 and monochromator 2) that irradiates monochromatic light onto the fluorescent sample 4 and a light receiving system (color filter 6 and A light receiver 7) is required. The color filter at this time is called a router filter because it satisfies the router conditions, and is used in photoelectric colorimeters that directly read stimulus values. However, it is quite difficult to actually create a router filter, so the present invention solves this problem as follows.

Between the sample surface 4a and the light receiver 7 (45° illumination and O.

light reception, 0° illumination and 45° light reception), or sample surface 4
One of n types of color filters 6 is inserted between the light receiver 7 and an integrating sphere (not shown) for diffusing the reflected light from a. In this case, the composite spectral responsivity sx expressed by equation 1
(λ), sy(λL sz(λ) (the virtual receiver at this time is hereinafter referred to as a composite receiver system) is a number of isochromatic matrix (
λ), 7(λ), τ(λ) or Ma. (λ);y□.

The type of color filter 6 is selected so as to be as close as possible to each value of (λL z□.(λ), and the coefficients a Xei, a ytiy a Zti : (i=
o to n). Note that the coefficient a X*i* a yti
Since ea2,1 can be a negative value, the degree of freedom when selecting a single-color filter is improved compared to the case of a colorimeter that directly reads stimulus values, and a synthetic light receiver system that meets router conditions can be virtually realized. .

Sx(λ)=Σ a X+iτX+i(λ)Sr(λ)
ma sy(λ)” *a y+i c y+i(λ)sr(
λ)Sz(λ)=E antiτz*i(λ)sr(λ
) (8) Here, τ8,1(λ), τ2,1(λ), τ
2,1(λ): Spectral transmittance of color filter 6 1=O-no
However, i=0 represents a state without a color filter.

[τ×,. (λ) = 9. . (λ)=τ2. . (λ)=
1. O] At this time, from equation 0, the spectral tristimulus value X (μ).

Y(μ) and 2(μ) are approximately expressed by the following equations.

X (μ) = Σβt (μ, λ) sx (λ) Δλλ Y (μ) = Σβt (μ, λ) S, (λ) Δλλ , Yi (μ) = Σβt (μ, λ) $2 (λ) Δλ
0λ Substituting equation (8) into equation 0 yields equation (10).

= Σ a) (,1 λ)=Σβt(μ, λbxvi(λ)8.(λ)
Δλλ Yi(λ)=Σβt(μ,λ)τ2,1(λ)sr(λ
)Δλλ ZL(λ)=Σβt(μ, λ)? zd(λ)8r(λ)
Δλ (11)λ Therefore, using the fluorescent object color measuring device according to the present invention, each of the first color filters 6 for isochromatic matrix (λ), y (λ), and τ (λ) is When installed in the mounting frame 5,
The spectral tristimulus values Xt(λ) and Yi(
L), Zip), the synthesized spectral king stimulus values X(λ), Y(λ), Yi(λ) are obtained from equation (10), and the fluorescent object under arbitrary illumination light is The color is found from 2〇.

The above is the measurement principle.

Next, the sample surface 4 generated by the light source 1 and the monochromator 2
Relative spectral radiant flux of monochromatic light at position a and receiver 7
The method for measuring the relative spectral responsivity of is described below.

Step A1: Install a photoreceiver with a known relative spectral response at the position of the sample surface 4a, and while changing the set wavelength λ of the monochromator 2, measure the output ○(λ) of the photoreceiver using a microcurrent meter. Measure.

Step A2 The relative spectral radiant flux P(λ) of monochromatic light at the position of the sample surface 4a generated by the light source 1 and the monochromator 2 is calculated from the following equation.

Here, S'(λ) is the relative spectral responsivity of the photodetector used in step A1.

Step A3 A commonly used standard white surface 4 such as barium sulfate or magnesium oxide is installed on the measurement sample mounting frame 3, and while scanning the set wavelength μ of the monochromator 2, the output rw (λ) of the optical receiver 7 is measured. read. Note that the receiver output r at this time
w(λ) is expressed by the following formula.

rv(λ)=P(λ)βV(λ)sr(λ)
(13) Here, P(λ) is the relative spectral radiant flux of the monochromatic illumination system mainly composed of light source 1 and monochromator 2, and βV(λ) is the geometric condition of illumination and light reception used for measurement. sr(λ) is the relative spectral responsivity of the photoreceiver 7.

Step A4: The relative spectral responsivity sr(λ) of the photoreceiver 7 is calculated from the following equation.

Next, how to select the type of one-color filter 6 and the coefficient a Xei
Describe how to find e a Fe1t a Zr2.
Step B1 First, the spectral transmittance τJ(λ)(
j=1 to m, m is the number of color filters used) is measured. Note that it is desirable that the number m of sheets be as large as possible in order to improve the measurement accuracy of the fluorescent object color, but the measurement of the spectral transmittance and the calculation process described below become more labor-intensive.

m types of color filters 6 are sequentially inserted into the color filter mounting frame 5, and the receiver output at this time is rF+j(λ): (j=1
~m, j=o represents the state without a color filter) is measured in the same manner as in step A3.

At this time, the spectral transmittance τj(λ) of the fifth color filter
is obtained from a linear equation.

Also, from the meaning of the title, rv. Because (λ), τ. (λ)=1
It is.

Step B Quadratic σ, σ9. The coefficient a XeLp a y+i+ a Zyi is determined so that the value of σ7 is minimized.

AX=BTx A,=BT.

(19) A2=BT2 Now, matrix AX? Ayg Az is here, and the wavelength range λ□ to λ1 is usually 300 to 780 nm.

Specifically, from among the m types of color filters prepared in step B1, n types (0<n5m) of color filters are extracted, and the coefficient a X+ is calculated from equations (17) and (19).
Calculate i* a y*i* a Zyi.

B=(+ir"8r)-'5rt(17) Here, the matrix Sr is the transposed matrix of the matrix Sr + (!i rt8 r)
″l is the inverse matrix of the matrix (s rts r).

AX= [a XtO"' a Xynko tAy"
[ay? .・・・aytnltAZ=Ca Zto
”' a Zynl t(20) Matrices Tx, Ty, T2 are 'rx= cx(λ,) -XCλ,) tT,
= [y(λ,)...y(λ,)] 1T2=[Ding(λ
1)...τ(λss)] t(21) Step B3 Reflection spectral radiance factor β of the fluorescence test color specified in the appendix of Japanese Industrial Standard JIS Z 8717. 1j (λ): (j
= 1 to 9), relative external fluorescence radiation efficiency Q a t j (λ
'), and the difference in tristimulus values ΔX, Δ from Equation 1 (22) and Equation (23) using the value of the relative spectral distribution Fj (λ) of the fluorescence component.
Calculate Y and ΔZ.

go(λ)βtyDy(λ)=go(λ)β. , Baλ)
50 10F λ)Σ so(λ') Qas j(λ')Δ
λ' (22) λ' = 300 [Σa Xpiτl (λ) Sr (λ) - Y (λ) month j =
1 [Σay*iτl (λ) Sr (λ) − y (λ) month i = 1 [Σazyifi (λ), r (λ) − T (λ) month (2
3) i=1 Here, 11 is the absolute value * 8 o (λ) and go (λ') are the relative spectral distribution of light for color embellishment 2 For example, Japanese Industrial Standard JIS
Relative spectral distribution of standard light DI5 specified in Z 7820 (Standard light and standard light source for colorimetry).

Step B4 Repeat step B2 and step B3 for all color filter combinations, and calculate the tristimulus value differences ΔX, ΔY, Δ
The combination of color filters for which Z is the smallest is selected as the color filter for the isochromatic number ma(λ), y(λ), and T(λ), respectively. In addition, the types of spectral transmittance τl(λ) of the color filter at this time are τ, i(λ), and τ9, respectively.
, 1(λ), τzti(λ), and the coefficient a L+i
*a yyi* a Adopt Zyi.

Next, the spectral tristimulus values X (μ), Y (μ), Yi (μ)
I will explain how to find it.

Now, the relative spectral radiant flux P (μ) [P obtained in step A2
(λ)] is irradiated onto the fluorescent sample 4, and the reflected light is captured by the composite receiver system, the result obtained is X'(μ
), Y'(μ), Z'(μ) are X'(μ)=QXP(
μ)
(24) Here, CXI Oye CZ is a constant.

becomes.

Therefore, the correction coefficients related to the spectral tristimulus values are determined by the following procedure.

Step C1: Install a commonly used standard white surface 4 such as barium sulfate or magnesium oxide on the measurement sample mounting frame 3, and while sequentially installing color filters 6 on the color filter mounting frame 5, adjust the output x'l of each light receiver, (μ).

Measure Y'i+v(μL Z'i+w(μ)).

Step C Calculate 2 for the tristimulus value correction coefficient expressed by the quadratic equation.

22, the wavelength range μm to μ is usually 300 to 780 nm.

Step C3 Next, while installing the fluorescent sample 4 in the sample-to-be-measured mounting frame 3 and sequentially installing the color filters 6 in the one-color filter mounting frame 5,
Each receiver output X'1 (μ).

Measure Y'i (μL Z'i (μ). At this time, the receiver output X'i (μ) + Y'i (μL Z'i (μ
) is expressed by the following formula.

X'(μ); ΣP (μ) βt (μ, λ) fxpi (λ)
Sr(λ)Δλλ Y' (μ)=ΣP(/A)βt(μ,λ)τ2,1(
λ)sr(λ)Δλλ z'(μ)=ΣP(μ)βt(μ,λ)τ2. i(λ)
Sr(λ)Δλ (26)λ Step C4 Spectral tristimulus values X(μ), Y(μ) of sample 4 to be measured.

, Yi(μ) are determined from the following equation.

ΣayyiY't(μ) Y(μ)=ky'“0 P(μ) Step C5 From 2〇, calculate the fluorescent object color under arbitrary illumination light.

Next, an actual measurement example based on this embodiment will be described.

The geometric conditions of the optical system of the fluorescent object color measuring device are 0° illumination and 45° light reception.

A halogen light bulb was used as light source 1. Further, the value of the relative spectral responsivity sr(λ) of the photodetector 7 used is shown by a solid line in FIG.

The following four types of samples were used as fluorescent sample 4.

■Fluorescent red coated paper (R) ■Fluorescent yellow red coated paper (0) ■Fluorescent yellow coated paper (Y) A) Fluorescent green coated paper (G) In addition, the regular standard white surface 4 is crimped with barium sulfate powder. Using.

Table 1 shows the tristimulus values of fluorescent object colors under standard light D□, which were calculated using 2 spectroscopic measurement data.

Table 1 Tristimulus values under standard illuminance and S If no color filter is used in the measurement optical system of this example shown in Figure 1, normal monochromatic illumination/non-spectroscopy w481! The apparent spectral radiance factor β under l. (λ) is measured. Above 4
Apparent spectral radiance factor β for different types of fluorescent samples. (
λ) is shown in Figure 3. When there is only a measuring device with monochromatic illumination and non-spectral observation method, and the measuring method according to the present invention is not used, the fluorescent object color is determined by this apparent spectral radiance factor β. .

(λ) is considered as the total spectral radiance rate βt,8(λ),
The only way to do this is to calculate the value using formula ■.

Standard light D calculated using this apparent spectral radiance factor
The difference ΔX between the tristimulus value of the fluorescent object color under 1 and the tristimulus value shown in Table 1 calculated using 2 spectroscopic measurement data,
ΔY, Δ2 and Japanese Industrial Standard JIS S 8729 (
Table 2 shows the color difference ΔE 'ab (in CIELAB units) according to JIS Z 8730 (color difference display method) and JIS Z 8730 (color difference display method).

Table 2 Measurement errors when not using this example) The average value of the tristimulus value error represents the average value of the absolute value of the tristimulus value error for each fluorescent sample.

In the measuring method according to the present invention, the more types of color filters 6 there are, the more the 81g determination accuracy improves. Here, four types of colored glass filters were used for each of the isochromatic numbers Ma(λ), y(λ), and T(λ). Spectral transmittance τ8 of each filter. i(
λ), τyi(λ), τ2,1(λ): (i=1~4
) are shown in FIGS. 4(a) to (c).

At this time, the values of isochromatic numbers Ma(λ), y(λ), and 2(λ), and the relative spectral responsivity sx(
λ), sy(λ)t sz(λ) are calculated as the fifth
They are shown in the figure by solid lines and broken lines, respectively.

Further, it was determined by a measuring method based on the present invention.

Spectral tristimulus value X (μ) for each fluorescent sample.

The measurement results of Y (μ), Yi (μ) are shown in Figure 6 (a) ~
(d) is shown by a solid line and a broken nine-dot line, respectively.

The difference ΔX between the tristimulus value of the fluorescent object color under standard light Do calculated using this spectral tristimulus value and the tristimulus value shown in Table 1 calculated using 2 spectroscopic measurement data, ΔY, Δ
Z and color difference ΔE east ab (in CIELAB units) are shown below.

Table 3 Measurement error when using the present example Comparing the values of Cloth 2 and Table 3, it can be seen that the accuracy of colorimetric values is significantly improved by this example based on the present invention. Therefore, it was confirmed that the measuring method according to the present invention can practically provide sufficient spectral tristimulus values necessary for calculating the fluorescent object color.

〔Effect of the invention〕

As is clear from the above explanation, (1) the fluorescent object color measuring method of the present invention is such that even without using a router filter, a virtual receiver system is constructed by determining coefficients so that the calculation conditions are the same as when using a router filter; Since the tristimulus values of the object to be measured are calculated from the spectral tristimulus values measured under each filter, it is possible to perform the same measurement as using a router filter without using a router filter.

And according to this measurement method, monochromatic light illumination.

Since measurement can be performed under only one non-spectral observation condition, there is no need to prepare two types of object color measurement equipment as in the one-light source fluorescence separation method and the two-light source fluorescence separation method stipulated in the Japanese standard JIS Z 8717. . Furthermore, since the measurement principle does not distinguish between the integrating sphere efficiency and the properties of the light receiver, it can also be applied to fluorescent object measuring equipment of the type that diffuses light from the sample surface with an integrating sphere and observes it with a light receiver. can. Furthermore, the optical system of this measuring device can be constructed by simply adding a color filter mounting frame to a conventional fluorescent object color measuring device and adding a program based on the measurement procedure of the present invention to the computer program for processing measurement data attached to the device. , because it can be easily modified,
has the advantage that it can be applied to most conventional devices.

In terms of measurement accuracy, it is comparable to the two spectrometer method, which provides accurate values among conventional fluorescent object color measurement methods, that is, the value of fluorescent object color under any illumination light. is obtained. In addition, the measurement results obtained with this measuring device are the spectral tristimulus values X (μ).

Y (μ), Yi (μ) [Number of data points 3 6°J'
t~μm is the wavelength range (usually 300~7g0nm)
, Δμ is a wavelength interval (usually 5n+1)], and the number of measurement data points to be handled is 2-1, λ, ~λ. is the wavelength range (usually 380~
Δλ 780nm) *Δλ is the wavelength interval (usually 5 nm)
], the measurement time and calculation time of the fluorescent object color for arbitrary illumination light are short, and when the measurement data is stored in a computer recording medium, there is an advantage that the file capacity is small.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an optical system for carrying out the fluorescent object color measurement method of the present invention, Fig. 2 is a graph of the relative spectral response of the photodetector system used in the embodiment of the above measurement method, and Fig. 3 is Graphs of the apparent spectral radiance of the fluorescent measuring object used in this example, and Figures 4 (a) to (Q) are graphs of the spectral transmittance of the color filters used in this example. (a) is x, (b) is Y,
((1) shows the Z stimulus value, Figure 5 is a graph of the colorimetric function and the relative spectral responsivity of the composite photoreceptor system in this example, and Figures 6 (a) to (d) are graphs for this example). A graph of the spectral tristimulus values of a fluorescent sample for monochromatic light excitation measured using the following example: (a) is the sample field, (b) is the sample orange, (c) is the sample yellow, and (d) is the sample edge value. show.

Claims (1)

[Scope of Claims] In a method of measuring the color of an object to be measured by illuminating the object to be measured with monochromatic light and observing the reflected light from the object to be measured with a light receiver system, the object to be measured and the light receiver are Spectral transmittance τ_ between the system and
x_,_i(λ), τ_y_,_i(λ), τ_z_,
A plurality of n types of filters having _i(λ) are interposed, and the spectral response of the photoreceptor system without filters is expressed as s_
r(λ), the formula s_x(λ)=▲There are mathematical formulas, chemical formulas, tables, etc.▼ s_y(λ)=▲There are mathematical formulas, chemical formulas, tables, etc.▼ s_z(λ)=▲There are mathematical formulas, chemical formulas, tables, etc. There are ▼ s_x(λ), s_y(λ), s_ obtained based on
The coefficients a_x_,_ are set so that z(λ) satisfies the router condition.
i, a_y_, _ia_z_, _i are selected to configure a virtual receiver system, and the spectral tristimulus values X_i(μ), Y_i(μ), Z_i(
μ) to the formula Based on the composite tristimulus values X (μ), Y (μ), Z (μ) under a virtual receiver system synthesized based on the formula X = ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ Y = ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ Z = ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ Calculate the tristimulus values of the object under illumination with an arbitrary relative spectral distribution s (μ) based on A method for measuring fluorescent object color characterized by: