JPH03223654A - Absorptiometer - Google Patents

Abstract

PURPOSE:To measure the concentration of an object component without the effect of the contamination of windows due to time change by using two cells having the different lengths, and obtaining the transmission ratio between the cells. CONSTITUTION:A measuring cell 3 and a comparing cell 9 are filled with reference liquid for zero adjustment. The intensity of the transmitted light under the conditions at this time is detected with a detector 5. The zero point and the span of an operating circuit 6 are adjusted. After the zero adjustment, sample liquid is made to pass through the measuring cell 3 and the comparing cell 9. The intensity of the transmitted light under the conditions at this time is detected with the detector 5. Operation is performed in the operating circuit 6 based on the result of the detection. Since the same sample liquid is made to flow through the cells having the different lengths, the surfaces of windows are contaminated at the same degree. The attenuations of the transmitted lights due to the contamination become the same degree in both cells. Therefore, the reduction in transmittance based on the contamination can be cancelled by obtaining the ratio between the transmitted lights in both cells.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention uses a flow cell (flowing liquid layer) as a measurement cell to calculate transmittance (transmitted light intensity during chromaticity measurement relative to transmitted light intensity at zero chromaticity). This relates to an absorption photometer (chromaticity meter) that calculates chromaticity from the ratio of This is related to a spectrophotometer.

Conventional technology The conventional technology will be explained below with reference to the drawings.

FIG. 18 is a schematic diagram of a conventional absorption photometer.

In FIG. 18, 1B is a light source device. In this light source device 1B, 1 is a light source, 2a is a first light flux lens (the second light flux lens will be described later), which is an optical means for collimating the light emitted from the light source 1, 3 is a measurement cell having a predetermined length (optical path length) b [cm]. In this measurement cell 3, 3a is the predetermined optical path that can be filled with a reference solution (pure water "ZO solution", "BIANK" means span solution) or /IVlj constant solution (hereinafter referred to as 1 sample residue J). A cell having a length 3b is a window (hereinafter referred to as 1 entrance window) provided in the cell (front surface) on the side where the photoelectric parallel light beam bundled by the light flux lens 2a is incident.
b2 is a window (hereinafter referred to as "light exit window") provided in the cell (contact surface) on the side that emits light that has passed through the inside of the cell.

At this time, the window thickness (the total value of the entrance window 3b and the light exit window 3b2) is W [cm], and the extinction coefficient of the window material is aw [cm].
'11, Thickness of dirt on the window (incidence window 3b and light exit window 3h2)
The stand? t'M) is d [cm], the extinction coefficient of the dirt attached to the window is ad [cm-''', and the sangre liquid turbidity is T.
[m g y' l ], the absorbance f$ number of turbidity is av[
l/mg・cm J, the absorption coefficient of the standard solution (pure water) is a, ) [cm-1], the absorption coefficient of the chromaticity component of the sample solution ($
Let the number be al; [1'/mg-cm]. Note that in the above, when simply represented by the symbol "a", it is an absorption coefficient. 5 detects the transmitted intensity of light from the light exit window 3b2 of the measurement cell 3 through a filter 4 provided in front of the light receiving surface (here, the case is shown where it is provided at 1&Z of the light exit windows).・It is a measuring detector. Regarding the filter,
Its thickness is F [cm] = extinction coefficient is ap [cm-']. 6 calculates the transmittance θ of the sample liquid based on the detector output of the detector 5 as described later, and calculates the chromaticity C [degrees = m
This is an arithmetic circuit provided to calculate g/l].

In a spectrophotometer having such a configuration, first, prior to measurement, the intensity of transmitted light is measured by the detector 5 when there is no sample for measurement inside the measurement cell (in other words, when the reference solution is injected). The zero point and span of the calculation path a are adjusted using the detector output at this time (hereinafter referred to as [zero mJ
).

At this time, the irradiance of the incident window surface of the measurement cell 3 by the light source 1 is IL [W/m'], and the light receiving surface of the detector 5 (zero "
The irradiance (transmitted light intensity when chromaticity is zero) of the light-receiving surface at the time of measurement is ILAo [W/m2].

After this zero adjustment, the sample liquid flows into the measurement cell, and the transmitted light intensity at that time is detected using the detector 5, and the arithmetic circuit 6
Calculate with. The irradiance (transmission intensity of measured chromaticity) on the light receiving surface of the detector 5 during this sample measurement is
S [W/m2].

From the above, the density calculation value, that is, the detected value during sample measurement is divided by the detected value during zero adjustment (the ratio of the transmitted intensity ILAS of the measured chromaticity to the transmitted light intensity ILAO when chromaticity is zero). It is possible to obtain the respective transmittance θ when the transmittance of is set as 100%.

That is, expressed in the formula: θ=ItAs/IL＾o=exp(-a-b-c)...
・(1) becomes. The absorbance abs (absolute value of absorbance) is 1 absorbance 1=10s (1/θ)=a −b−c−■, and the chromaticity can be calculated from this formula.

Here, the detection output at zero adjustment is α(t+a)ILAO(
t+a), where tl& is the time of zero adjustment, and "(1)" at this time means a function of time. Similarly, at this time, the incident light is absorbed and scattered by the reference liquid/incidence g3b, the light exit window 3b2, and the dirt thickness d/filter 4 attached to these, and is attenuated, (cao (tea)/IL( tea)=A-ex
p I-at-d (t+ a ) l =43) holds true. However, A is a constant (const, ).

On the other hand, the detection output during sample measurement is α(t2a
) ・, ItAs (t2a), where 1゜2
Let a be the time at the time of sample measurement. In addition to the above-mentioned attenuation element, the incident light at this time is further affected by the chromaticity C and turbidity T of the sample liquid.
is a damping element, ILAS(t2a)/IL(t
2a) =A-exp (as-b-c) exp(ad-d(t2a)) expf-av-b-T) -(4) holds true. Therefore, the transmittance θ is (+), and from equations (3) and (4), θ
=α(t2a)・ILAs(t2a)/α(tea)
・ILAo (tea)=fIL(t2a)/It
(tea)) (α(t2a)/α(tea)) -exp (-as Hb-c) exp[ad (d(t2a) d(tea))]-
eXp f-a7-b-”ri=(s).
2 pieces, I[(t2H),,,'11ft+a)1,
Assuming that α(j2a)/α(tea)=1 (the light source brightness and detector sensitivity are stable), Jl−:) d (t
, 2 a > = i, ((t + a > (the dirty state of the window does not change), and assuming that 1" = O (no turbidity exists), equation (5) becomes θ = exp (-aS-b-C) -(s)
Therefore, chromaticity measurement becomes possible.

However, with an absorptiometer like the one shown in Figure 18, there is a time difference between ILAO and ILAS measurements, so the light source brightness and detector sensitivity actually vary slightly.

It is quite conceivable that the state of dirt on the windows and the suspended solids will change. Therefore, the influence of this change directly leads to instability of the measurement results. Therefore, in order to avoid such a situation, an absorption photometer having a structure as shown in FIG. 19 can be considered.

FIG. 19 is a schematic diagram of a conventional spectrophotometer that is an improved version of FIG. 18. Note that the parts in FIG. 19 that overlap with those in FIG. 18 are given the same numbers and symbols, and the explanation thereof will be omitted.

In the tJ19 diagram, 182 is a light source device. In this light source device L8□, 2b is a second light flux lens which is a second optical means provided at a position of, for example, 90" with respect to the first light flux lens 2a. 7a is a second light flux lens 2.
A first mirror 7b is provided to reflect the light emitted from the light source 1, which is bundled by b, in parallel with the light passing through the measurement cell 3, and 7b reflects the light reflected by the first mirror 7a. Reflect it on the third mirror 7C (this third mirror 7C
(The light reflected by the second mirror becomes the reference light) A second mirror 7 is provided between the second mirror ~7b and the third mirror 7°C to pass the light reflected by the second mirror 7b. It is a shutter that can be used to block or block light. As a result, the illuminance on the light receiving surface of the detector 5 is ILA when the shutter 8 is closed.
O or ILAS (same as in Fig. 18), and the irradiance of the light receiving surface of the detector 5 due to the reference light reflected from the second beam lens 2b to the third mirror 7C is ILN [W/m']
When the shutter 8 is open, the IL
Ao+ILIM or ILAS+ILM. here,
It yen/It = 4 (constant).

After performing the above-mentioned zero adjustment in such an absorption photometer, the intensity of the transmitted light of the sample liquid is detected by the detector 85, and the arithmetic circuit 6 performs 11i13E. That is, (detector light-receiving surface irradiance when the shirt lid is closed) / ((detector light-receiving surface irradiance when the shirt lid is open) (detector light-receiving surface irradiance when the shirt lid is closed)) = I + - * o / Ich (zero timing) or 1l-
AS/ILM (during sample measurement) - From (7), transmittance θ (=I+, As /
I l-A O> can be obtained.

This will be explained in more detail below.

If the detection output of zero timing (this time is designated as tub) is when the shirt shirt is closed, α(t+b)・ILAO(t+b),
When the shirt is open, α(t+b) IIL^. (t+ b )+I LM (t+ h
) ) becomes. At this time, I+-mu based on equation (3). (tl b ) / I L (tl b
)=A-exp t-ad-d (tl b )l=(
The relationship 8) holds true. Therefore, (detector light-receiving surface irradiance when the shirt lid is closed) / ((detector light-receiving surface irradiance when the shirt lid is open) (detector light-receiving surface irradiance when the shirt lid is closed)) = ILAo (tl b ) /
ILM (tl b )=(1/A)・ILAO(t
l b )/IL(tlb) −(1,/+1ri・A・exp I aa-d (tl b ) l”(9)
A calculation result is obtained based on the detection output at the time of zero adjustment.

On the other hand, the detection output during sample measurement (this time is t2b) is α(t2b) when the shutter is closed.
・ILAs(t2b), and when the shirt flap is open, α(t2b) fl LAS(t2b)+ILh(t2b)
) ) Therefore, (detector light-receiving surface irradiance when the shirt lid is closed) / ((detector light-receiving surface irradiance when the shirt lid is open) - (detector light-receiving surface irradiance when the shirt lid is closed)) -・I LA s (t2 b
)/I LM (t2b)=(]/A)-A-e
xp (-as-b-c)-exp (-ad-d (
t2b )1e xp (-ay -b -Tl -0
A calculation result is obtained based on the detection output during sample measurement, which is Φ. (9), From equation 00, it can be seen that even if the light source brightness and detector sensitivity change (to explain this change using the equation, IL(tl
b) ~ Ic (t2b), α (tl b ) ~ α (t2b
), and if we take the ratio with the reference light for each measurement, we can see that the effects are canceled out.

At this time, the transmittance used for concentration calculation is calculated from 0Φ÷(9) (calculation result based on detection output during sample measurement)/(calculation result based on detection output during zero adjustment)"eXp(-ag-b
-c) exp [-aci (d (t2b)d (t
l b ) l ]-e xp (-at
-b -Tl ・01) As a result, by configuring as shown in Fig. 19, it will not be affected by changes in light source brightness and changes in detector sensitivity (of course, in the short period between opening and closing of the shutter, (The assumption is that it will not change.)

<Problems to be Solved by the Invention> By the way, this conventional spectrophotometer is based on the assumption that the dirty state of the window does not change and that there is no suspended matter. However, this is an extremely difficult assumption in reality, and in reality, the state of dirt on the windows will of course change, and the effects of turbidity will remain. Therefore, there was a problem in that measurement results were inevitably unstable due to these influences.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to provide a window that is not affected by changes in the luminance of the light source, changes in the sensitivity of the detector, and dirt in the sampling system. unaffected by aging stains or suspended solids in the sample.
provides an absorptiometer that can measure the concentration of a component of interest.

Means for Solving the Problems> In order to achieve the above object, the absorption photometer of the present invention is provided with an entrance window and a light exit window at the front and back, and has a predetermined optical path length that allows the inside to be filled with a sample liquid. In an absorption photometer, the absorption photometer is equipped with a measurement cell configured with a cell having a cell having a light input window, a light source device that irradiates light to the entrance window, and a detector that passes through the inside of the cell and measures the intensity of light transmitted from the light exit window. The measurement cell has a cell having an optical path length different from that of the measurement cell, and the measurement cell is provided with an entrance window and a light exit window, and the measurement cell is filled with the same sample liquid as the measurement cell. A comparison cell connected to the cell; means for guiding light from the light source device to the measurement cell or the comparison cell, or an entrance window of the measurement cell and the comparison cell; light passing through the interior of the comparison cell and emitted; A shutter that passes or blocks the comparison light emitted from the window, or one or more filters that are arranged after the light exit windows of the measurement cell and the comparison cell and that can select the wavelength may be installed. a rotatable disk whose plane is perpendicular to the optical axis of the light flux of the measuring cell and the comparison cell and whose center of rotation is at a position equal to the distance from the two optical axes, said disk; characterized by comprising: a filter that is provided in front of the light-receiving surface of the detector when a filter to be assembled thereon is not provided; and means for guiding the comparison light or the comparison light and measurement light to the detector; The sample liquid is measured based on the light that has passed through the measurement cell and the light that has passed through the comparison cell.

In addition, an R#I for manually setting the turbidity compensation amount is provided in the configuration of the spectrophotometer, and the signal from this mechanism is guided to the arithmetic circuit, and the signal from this mechanism is used to set the amount of turbidity compensation in the sample during chromaticity measurement. The calculation is performed according to the type of turbidity.

<Operation> By using two cells (a measurement cell and a comparison cell) with different cell lengths and calculating the ratio of transmitted light of these cells, it is possible to eliminate at least the influence of window dirt. Further, by manually setting the turbidity compensation in, calculations are performed in accordance with the type of turbidity in the sample.

<Example> Examples will be described with reference to the drawings.

In the following drawings, parts that overlap with those in FIGS. 18 to 19 are given the same numbers and symbols, and the explanation thereof will be omitted or simplified.

FIG. 1 is a schematic configuration diagram of an absorption photometer showing a specific embodiment of the present invention.

In FIG. 1, reference numeral 9 indicates an entrance window 9b and a light exit window 9 at the front and rear.
b2 is provided with a cell length different from the cell length of measurement cell 3,
Here, it is configured with a short cell length (optical path length) b2 [cm] and is a means for guiding the light from the light source device IB2 (the light bundled by the second light flux lens 7a) to the entrance window (here, the mirror 7a
is used) is incident through the! This is a comparison cell placed in . Its configuration is the same as that of measurement cell 3 except for the cell length (thickness of dirt on the window, absorption coefficient of dirt attached to the window, etc.), and it meets the same standards as measurement cell 3. The cell 9a is connected to the measurement cell 3 so as to be filled with liquid/sample liquid, and passes through the entrance window 9b+ provided at the front of the cell into which the light beamed by the second beam lens 7a enters, and the inside of the cell. A light exit window 9b2 is provided on the rear surface of the cell on the side from which the light is emitted. Note that the light exiting the light exit window 9b2 is herein referred to as comparison light, and by providing such a comparison cell 9 and calculating the ratio with the transmitted light of the measurement cell 3, the influence of dirt on the window is removed. Here, 4a
, 4b is a filter provided to select the wavelength and adjust the amount of light. Output light of comparison cell 9 (comparison light)
is passed through or blocked by the shutter 8. Note that the positions of the shutter 8 at this time are mirrors 7b and 7c in FIG.
However, it is also possible to provide it between the comparison cell 9 and the mirror 7b (that is, it may be provided anywhere between the comparison cell 9 and the detector 5). can. Also, at this time, mirrors 7a and 7b, ? c etc. are provided as a means for guiding the comparison light to the detector 5, and are not limited to this, and it goes without saying that they can be replaced by other means, such as optical fibers. Nor.

Here, when the shutter 8 is closed, the illuminance on the light receiving surface of the detector 5 is ILAO or ILAS as described above.
In the state where the shutter 8 is open when the irradiance of the light receiving surface of the detector 5 due to only the comparison light is I[ao (base 2I! liquid) or Ic5s (sample liquid >[W/m']), is ILAo+ILBo or I LA S +
It becomes I LB G.

In an absorptiometer with such a configuration, first, as a zero adjustment (the time at that time is j+C), the measurement cell 3 and the comparison cell 9 are filled with a reference liquid, and the transmitted light intensity under each condition at that time is measured by the detector 5. After the detection, the zero point and span of the arithmetic circuit 6 are adjusted, and after this zero adjustment, the sample liquid is passed through the measurement cell 3 and the comparison cell 9.
A detector 5 detects the transmitted light intensity under each condition (cJ and C), and a calculation circuit 6 performs calculations based on the detection results.

t), (Detector light-receiving surface irradiance when the shutter is closed) / 'fI' Detector light-receiving surface irradiance when the shutter is open (Detector light-receiving surface irradiance when the shutter is closed) (ILAO or I tA
s'r l ((I L A O+11, BO or I L A St-K t s s ) (ItAo or ILA5)) i L A O/" I L s o (71st time), or From ILAs /""ILBs (during sample measurement) -1127, transmittance θ(= (I t
As z"' I t a son, 2 (I L A O
, yIL a o ) and calculate the drift epidemic. Hereinafter, this will be explained in more detail.

During zero timing, when the shirt flap is closed, the detection output c7') is α(tic)・I(μo(tic), and when the shirt flap is open, it is α(tic)・+ILAO(tic)
)+Ii, soft+c)l. At J7, I L A O (t + c) / I
L A (t, + c) = exp (a
o Hb+ ) exp f-ay ・ (W+))exp f-
aa −d+ (tlc))e xp
The relationship (-ap-FI)-(13) holds true.

Once, ILA is the irradiance [W/m2] of the entrance window surface of the measurement cell 3 by the light source 1. Also, b,, w,,...
・Each subscript of the cap has the meaning of each symbol mentioned above regarding the measurement cell 3.7 And this formula (13) is for the measurement cell 3.
The incident light 1+, x (tic) is absorbed and scattered by pure water, W, d, and F, and the illuminance I on the light receiving surface of the detector 5 increases.
1. A.

(tic), t' indicates a damping relationship. Similarly, for comparison cell 9, ILB. (1+C)/l
Llll (t-+ c)eXP (-
ao-bz) exp l-aw・(W2)) exp(ad-d2(tic)) exp(-ap-Fz 1=(14) holds true. The irradiance of the entrance window surface is [W, , im'-1.Similarly, b2
．． Each subscript such as w, . And this (1
Equation 4) is the illuminance at the light receiving surface of the detector 5 when the incident light ILe(tic) is absorbed and scattered by pure water, W, d, and F in the comparative cell 9! .

7, which shows a relationship that decays to 11o(tic), so these! From formulas 13) and +14), (detector light-receiving surface irradiance when the shirt lid is closed) ((detector light-receiving surface irradiance when the shirt lid is open) - (detector light-receiving surface irradiance when the shirt lid is closed)) - αft+c)・ILAo (tic)/
[α(the) ・(IcAo(tic)+
ILBO(tic))-α(tic)・ILAO(ti
c) 1 = I L A O (t + c ) / I t s
o (t + c) = Bo −exp [−aa
fd+(tlc)d2(tic))...(15) is obtained. (II L, B are constants, Bo=
; I I a'(tic)/its (tic))
・exp(ao(b+bz))−e exp
(-'aw (W,-W2))・(,4xp!
ap(FI F2))...(1 et al.), I mA (tl c n/"I ts
(t l c > is the measurement cell 3 and the comparison cell 9
The entrance window surfaces 3b, , 9b.

This is the ratio of the illuminance at
9b, the illuminance ratio ILA (t2c), /ILB
(t2c). That is, I LA (tl C)/I LB (tl c
)=IcA (t2e)/I Ls (t2c)
−・(17) On the other hand, if sample measurement is performed at time t2C, the detection output when the shirt shirt is closed is α
(t2c) ・ItAs (t2c), and when the shirt flap is open, α(tzc)・(TLAs (tzc) ten ILBS
(t2 c )1, then 1+, ^s (tzc)/ILA (t2C)=
exp (-ao -b+ > -exp (-a9 Hb, +c) ・exp(aw-W+) ・exp (-ad-(f+ (tzc))-ex
p (-a7- b, T) -exp (-aE -F+ l-118)ILB s
(tzc)/l 1B (tzc)exp
(-ao -b2) -exp (-as-b2 ・e) -e exp (-aw-W2) -exp 1-aa ・dt (tzc)1-e
xri (-at -b2 T)-e xp! -a
The relationship p°F2)=−(19) holds true. Therefore, from (18) ÷ (19), (detector light-receiving surface irradiance when the shirt lid is closed) / ((detector light-receiving surface irradiance when the shirt lid is open) (detector light-receiving surface irradiance when the shirt lid is closed)) IL
AS (t;ac)/lLa5 (tzc)BS-e
xp (-as (b2-b2)c)・eXP [
ad (dt (tzc)d2 (tzc)! ・exp f aT (b+ b2)T)...
(20) is obtained. However, B S is a constant, and b 1, ”
! It*(tzc)/I s (t 2
c)・eXPf ao(t)+b2
)-exp(-aw(W+-W2)・
exp f--a F (F+
F2 ) )...(21) Do. Both formulas f15) and t21) are based on the cell length difference (
The relational expression is 1)+-b2). This is done by putting the same sample liquid into two measuring cells of different lengths, using one light source, one detector, and aτj constant cell 3. This is a result obtained by measuring the transmitted light of the comparative cell 9 and taking the ratio of the detected outputs at that time.

The transmittance used to calculate the concentration in case 2 is f21LN15)
From, (calculation result based on detection output during sample measurement) / (calculation result based on detection output during zero adjustment) = exp (-as
(b+-b2) cloexp (at (b+ b
2) T)・exp[ad (dt (tzc) d 2
(t 2 c)) /eXp[ad fd+
(j+c) d2(t+c) l L... [22) At this time, the state of dirt on the window changes over time, but the state of dirt on the measurement cell and comparison cell are considered to be the same, so dt (t2C)=d2 (tzc), dt (t+c)=d2 (t
, +c). Therefore, the right-hand side of equation (22) is exp
I-as (b+-b2)c)・eXpI at
(b+b2)T'l·123) Therefore, according to the present invention, the light source brightness change.

It is not affected by changes in detector sensitivity or dirty windows.

Other Embodiments> By the way, the present invention is not limited to the configuration shown in FIG. 1 described above.

(■) That is, it is possible to further avoid the influence of turbidity based on the configuration shown in FIG. However, turbidity detection in this case is not affected by chromaticity, i.e.
It is assumed that a wavelength band that is not absorbed by chromaticity can be used. Based on this precondition, a configuration as shown in FIG. 2 can be considered as a concrete configuration that can avoid the influence of turbidity.

FIG. 2 is a schematic diagram of an absorption photometer showing another specific embodiment of the present invention. In addition, in this figure 2, the first
The parts that overlap with the figures have the same numbers.

Reference numerals are given and explanations thereof are omitted.

In FIG. 2, 51 is a filter 5 that can use a wavelength band that is not absorbed due to chromaticity in front of the light receiving surface.
This is a turbidity detector that is not affected by the chromaticity of the addendum in which 1a is placed. This turbidity detector 51 has the function of filters 4a and 4b arranged in the tIk portion of each measurement cell in FIG. 1 on the front side of the light receiving surface (therefore, the filters 4a and 4b are omitted at this time) By attaching the filter 5a to the detector 5 (which in this case will be used as a chromaticity measuring detector), turbidity and chromaticity can be detected independently.

In such a configuration, (transmittance due to moisture) = exp fav (b + - b2) Tl = 124), so (23) ÷ (24), (transmittance due to chromaticity) - exp (- as (b+-b2)c)-(25), and the chromaticity can be obtained independently.

It goes without saying that in FIGS. 1 and 2, other means, such as optical fibers, may be used to transmit or change the optical path.

(■), FIG. 3 is a schematic configuration diagram of an absorption photometer showing another specific embodiment of the present invention, and FIG. 4 is a diagram for explaining FIG. 3. In addition, in this figure 3, figures 1 and 2
18 and 19 are given the same numbers and symbols, and the explanation thereof will be omitted.

In FIGS. 3-4, 80 is arranged at the f& stage of the light exit window of the measurement cell 3 and the comparison cell 9, and is one or more wavelength-selectable filters (here, for example, a chromaticity filter). 4b and a turbidity filter 4C) can be assembled. It is a rotatable disk whose center of rotation is at the same distance from the This disc 80 has, for example, a position detection notch 80a and a position detection reset notch 8.
0b is provided. and one or more wavelength-selectable filters (here two) on the disk.
4c and 4d) are assembled. 7
d and 7e are means for guiding the comparison light and the measurement light to the detector 5, and here, a condensing optical means such as a concave mirror is used to condense the two beams into one place so that the detector 5 can detect them. be. In other words, the detection unit 85 is placed at a place where the two light beams are focused, and is arranged so that the two light beams pass through each other, and the connecting hand P is arranged so that the two light beams pass through each other, and the connecting hand P is arranged so that the same sample passes through.
The intensity of the light that has passed through the measurement cell and comparison cell connected by i (indicated by symbol Z in FIG. 5, which will be described later) and the light that has passed through the comparison cell 9 is detected. Reference numeral 10 denotes a position detector (position detection photo interrogator) that outputs a signal when the disk 80 rotated by the drive motor M using a drive transmission means (for example, a belt, etc.) is at a predetermined position. means for separating and calculating the signal from the detector 5 using the signal from the position detector 10 as a bold signal (
sample holding means) 60a, and calculation means 60b provided for calculating the chromaticity and/or turbidity of the sample liquid based on the output from the sample holding means 60a.
It is an arithmetic circuit consisting of. By the way, this Figure 3 shows a case where the arrangement relationship between the measurement cell and the comparison cell shown in Figures 1 and 2 described above has been changed, so in this case, the light from the light source device is transferred to the measurement cell. The first mirror 7a, which is a means for guiding the light to the entrance window, is arranged in front of the measurement cell 3.As shown in FIG. 12(A), which will be described later, the light source device 1. Placed in the middle position between 3 and comparison cell 9! Then, the emitted light is reflected by a pair of reflecting means (light condensing optical means) provided on opposite sides of both cells, that is, at a position opposite to the condensing optical means 7d and 7e in FIG. When the structure is such that the light is directed to 7a+ and 7a2, the resulting reflected light is guided to the entrance windows of both cells.

In addition, although FIG. 3 shows a case where the shutter 8 shown in FIGS. 1 and 2 is not provided, there is no particular limitation on whether or not it is installed (if the filter is assembled on this disk) Of course, for example, the filter 4a in FIG. 1 is omitted).

Even in the case of such a configuration, the functions are the same as those explained in FIGS. 1 and 2, so only an outline thereof will be given.

By rotating the disk 80, for example in the ω direction, the position detector 1
From 0, as shown in FIG.
"The signal is obtained, and then the pulse width is continuously shortened (1) in the successive position detection reset notches 80b,...
4) Get the signal. Further, due to the rotation of the disk 80, for example, as shown in FIG.
ef [where Ic is the chromaticity measurement wavelength light (sensitive to chromaticity and turbidity), Ref is the detected value of light passing through the comparison cell], the second pulse that has passed through the comparison cell 9 and the turbidity filter 4d It-Ref [where rt is turbidity measurement wavelength light (sensitive only to turbidity)], measurement cell 3 and chromaticity filter 4
The third pulse Ic-Mes is the detected value that has passed through the measurement cell 3 and the turbidity filter 4d.
Obtain Mes respectively.

In the sample hold means 60a, the position detector 10
The position is reset using the long pulse width "0" signal from
In the following short pulse widths (1), . . . (4), the signals from the detectors 5 at the respective positions are distributed (the detection signals are separated and calculated) and held.

In the calculation means θOb, this sample hold means 6
Output from 0a (Ic-Ref, It-Ref.

IC-Mes, It-Mes), change the color and/or turbidity of the sample solution to chromaticity - + XIc absorbance - 2X It absorbance turbidity - 3
XIt absorbance...(26)(f81
．． Kl, ni2, ni3 are constant 11) (principle formula of chromaticity measurement), and calculate it from the chromaticity signal 1cCull
It can be separated and output as turbidity signals It and t. Here, Ic absorbance refers to absorbance at the chromatic absorption wavelength, and It absorbance refers to absorbance at the turbidity measurement wavelength.

FIG. 5 is a tree top diagram as a specific example of the arrangement of FIG. 3. In FIG. 5, the figure (A>) represents a side view taken along the line A-A with respect to the front view of figure (B), and the figure (C) represents a side view taken along line B-B with respect to the front view of figure (B).

In FIG. 5, the arrangement is such that the light source 1 is placed on the left side, and the optical means 2a and 2b for converting the light emitted from the light source device 1 into two parallel beams are placed. A light source device fLB2 is configured to irradiate light to the entrance windows of the measurement cell 3 and the comparison cell 9. At the bottom of the optical means 2a there are arranged means 7a for directing the light therefrom to the entrance window of the measuring cell 3. A tubular connecting means Z using, for example, an O-ring is used to connect channels with different lengths and through which the same sample passes, at a position where two parallel beams of light emitted from the light source device 1 pass through, respectively.
A measurement cell 3 and a comparison cell 9 are arranged, connected by (
In this case, the liquid flow Q can be made to flow from the comparison cell 9 side to the measurement cell 3 side as shown by the arrow in the figure, or vice versa). Optical means 7d and 7e are arranged to condense the light flux (comparison light and measurement light) that has passed through the
A detector 5 for measuring the transmitted intensity of light is arranged at a position guided (focused) by 7e. These optical means 7d, 7e, detector 5, measuring cell 3 and comparison cell 9
A rotatable disk 80 whose plane is perpendicular to the optical axes of the two light fluxes from the measurement cell and the comparison cell and whose center of rotation is at a position equal to the distance from the two optical axes is arranged between the measurement cell and the comparison cell. .

This disc 80 is here driven in rotation by a drive motor M arranged at the bottom of the measuring cell 3, for example by means of a belt Be. For example, a position detector for detecting the positional state of the disc 80 is provided at a predetermined position of the disc 80 (installed at a position that cannot be seen in FIG. 5).

(■) Among these spectrophotometers, when measuring chromaticity, the practical convenience can be further increased by adding an am for manually setting the turbidity compensation amount.

That is, in the above explanation, the value of 2 in equation (26) is treated as a constant determined by the turbidity standard kaolin. By the way, when we examine the turbidity of sample water in detail in the field, we often find that it contains sludge from the process, rust, sand, and other pond materials, in addition to viscous substances such as kaolin. In such a case, for example, considering the case of "rust", the coefficient of the turbidity compensation term is 2, which is different from that of kaolin. This results in errors in the chromaticity measurements when rust is present.

Therefore, since the type of turbidity contained in the sample water is almost determined by the target process, the value of the turbidity compensation coefficient of 2 is manually set according to the type of turbidity in the sample to be measured. It is conceivable to add m width to enable setting of coefficients in accordance with the situation at the single-layer application site. Specifically, for example, what is shown in Figure 3? This is the setting mechanism shown by the broken line C′ which is obtained by adding f・1 to the i4 arithmetic circuit 60F].
It is called c (in addition, in the calculation l se 1 path 60 this turbidity 9
(Although it is described and shown as incorporating the base 11/W setting device +30C, it goes without saying that it is better to install it separately and independently).
・This is a configuration diagram showing an example, and the same L! j (A) is a view from the scale plate side, and the same figure (B is a diagram of the overall configuration).

In FIG. In addition to typical turbidity (symbol A,
, A2. ...) Write the second position in the constant (set it to 7), and make it easy to set it by positioning l [(click a ellipse, etc.) to stop at that position.

Of course, this can also be configured with actual suspended solids on-site, etc., and set to that value. It should be noted that the setting mechanism is not limited to such a configuration, and it goes without saying that a digital setting device can be used in accordance with the configuration of the arithmetic circuit, for example.

Hereinafter, the function of this function will be explained using a mathematical formula.The absorbance due to the chromaticity absorption wavelength "IC absorbance" includes the absorbance due to the chromaticity component (Ice absorbance) in the sample water, and the absorbance due to the turbidity component t. (Ict absorbance) is the same, so 1<IxiC absorption +6 degrees! (Ncc absorbance) + (Ic + absorbance))...
(27) becomes. Therefore, the formula (26) is: Chromaticity = + ((Icc absorbance + (Ict absorbance)) K2
・It absorbance ...(28) To remove the influence of turbidity, K2-1. Absorbance - = +
・Ict absorbance ・2 is set so that it becomes (29).

Figure 7 is a diagram showing the influence of turbidity on Ic1 absorbance. As shown in this figure, the absorbance IC + absorbance due to turbidity at the chromaticity wavelength is determined by the type of turbidity (A, “Kaolin” ~ It depends on A2). Therefore, change 2 (29)
Make sure that the formula holds true.

In this way, an absorption photometer with Rm that compensates for the influence of turbidity has a manual setting device for the turbidity compensation coefficient, and the value of the coefficient can be adjusted according to the type of turbidity in the sample vI to be measured. By configuring it so that it can be set, a more accurate chromaticity measurement value can be obtained by performing turbidity compensation according to the actual turbidity in the process.

(■)5 In FIG. 5, the following structure can be used as a lamp fixing structure as an optical product.

FIG. 8 is a diagram for explaining the lamp identification structure, and FIG. 9 is a diagram showing a specific example of the lamp fixing structure used in the present invention.

Generally, as shown in FIG. 8(A), the light source lamp is fixed to the lamp fixing part 110 using a rung rotation fixing jig 100 having a screw hole 100a provided in the collar, or As shown in B), insert the light source lamp into the lamp fixing part 111 and tighten it from the side with the fixing screw 112 to fix it.
! Although the fA structure is well known, positioning the lamp is an important technique for optical instruments such as the one in this application that measure chromaticity, turbidity, etc. In addition, there are problems such as poor alignment accuracy, and in the case of the figure (B), the direction of the filament cannot be determined. In this application, the direction of the filament is considered to be the most important. This type of structure (lamp holder structure) is shown in Figures ≦), which uses an inexpensive lamp fixture that can be precisely adjusted and the height can be easily adjusted.

The structure c'j in FIG. 6. Here, the slit of the lamp clamp part is cut in the axial direction of the cylindrical shape, This pickpocket Jl and the protrusion that determines the direction of the lamp filament (1≧1) 1 indicates the case where the filament central axis 1F and this protrusion are perpendicular to each other)
11 are fitted together and rotated, thereby changing the direction of rotation of the lamp.

Also, Filameni!・The first place deciding hole is a sandy lamp.

U □) (The tab 1", which is drilled at the position that uniquely determines 17M (for example, the Noiramen 1 position)), the position of the filament center axis 1F matches the filament 7 h11iI positioning hole and the filament. I get criticized for letting people do it.

In addition, 1300 is a light projection window, WB is a wire band for clamping the rung inserted into the rung clamp part, and Re is a wire fixedly connected to 41 (ffiHte) at the bottom of the lamp, for example, by soldering.

With this structure, the position in the lamp rotation direction is determined by the slot cut in the lamp part 2.
The lamp position can be easily determined by aligning the filament position with the filament positioning hole.

(V), measurement cell 3 connected by connecting means 2 so that the same sample of different length passes through 4j:+ position where two light beams emitted from the light source device ζ at 512+1 pass through, and comparison In the structure in which cell 9 is arranged and a light guide [2] is arranged to condense the luminous flux that has passed through the inside of the two cells in the latter stage to one place, the measurement cell and the Jt12 cell are arranged.
cj The arrangement is like 2 missing.

Fig. 10 is a structural diagram 1 of the arrangement example of No. 5171, and an explanation related to Fig. 6 (I(A) is a hemostatic diagram, and f13 in the same figure is a view from the direction of arrow α; : [,21, same figure (
C) represents trq when viewed from the arrow [Iiβ force direction. 1st
11 Mel is 1 in Figure 10? ! +It is a diagram for explaining the problem.

Generally speaking, E+, liquid inflow, flow 1"11-
1" connectors CL to CN are fixed with PT screws 11,
At the same time, tubular connection means using O-rings) i or groups 1 and j
The measurement cell 3 and the comparison cell 9 are fixed by screws to the lower cell fixing bracket 381 or the base plate Be, which is a housing, as shown in FIG.
One conceivable structure is that the upper 11tll7 fixing bracket and cell fixing SB2 are combined so as to sandwich the comparison cell 9 therebetween. At this time, the inner sides of the cell fixing browsers +- are formed into a shape having a claw (wedge-like shape) with a hole into which both cells can fit, and both cells are fixed as shown in the figure.

In general, there is no problem with this kind of structure, but if you think about it thoroughly, this structure has the following problems: (1) Since the connector CN is a screw type, the connector CN shown in Fig. 11 (A)
As shown in the figure, the direction of the nozzle hole where MQ is ejected from the nozzle attached to the tip of the connector located inside the cell is not determined (in the direction of the arrow φ shown in A>). Due to the factors such as " Due to the simultaneous fixing, distortion of the measurement cell and the way the screws are tightened may affect position repeatability, which may affect performance. There is room for some improvements, such as poor maintainability, such as the need for a special tool J to remove the window frame that locks the window glass from the outside during membrane maintenance such as cleaning the window glass We.

Therefore, in view of the above two points, the following W4
If the construction is different, the present invention becomes even more superior.

Figure 12 is a structural diagram of the installation and arrangement of the measurement cell and comparison cell used in the present invention, which solves the problems in Figure 10, where (A) is a front view and (B) is a direction of arrow The same figure (C) is a figure seen from the arrow y1 direction, the same figure (C) is a figure seen from the direction of arrow y1,
D) represents a view seen from the arrow y2 direction.

In FIG. 12, the main components of the entire structure are measurement cells 3.
Comparison cell 9. Nozzle connector NC (one-piece structure of nozzle and connector, respectively referred to as NC and ~NC3),
and a pair of cell fixing brackets 3181.5LB2 whose bent portion also serves as a stop for removal, and fixes the cells 3 and 9 to the brackets 5LB1.5LB2 and at the same time fixes the direction of the nozzle of the nozzle connector NC and the connector. Make sure that the removal is stopped.

These are assembled as follows.

(A), screw cap SK (individually not represented by SK, ~SK) with male threads cut and female threads cut at both ends of the cell is used to connect window glass We through spacer sp and o-ring OR. to be fixed.

(b) The measurement cell 3 and the comparison cell 9 are a pair of brackets 5.
LB1. It is fixed independently to Sl and B2 with screws cut into the flange part (However, comparison cell 9 is fixed with bracket 5182.
).

(c) The nozzle connector NC is, for example, a hexagonal flange NC.
It is a plug-in type (PT screw is not used) and is sealed with an O-ring OR2.

Using this nozzle connector NC, the cell is
After being fixed to the bracket 5LB1.5IB2 by (b), the nozzle connector NO is inserted at the point where it hits the surface of the self-flange fixing part ε, and the cell is rotated in the rotation direction ω with respect to the axis χ in the flow direction of the liquid. After prohibition and positioning, cells 3 and 9 are fixed. That is, the cell is fixed by inserting the nozzle connector NG.

(iv) After this, in order to securely fix the cell, the bracket SLBM, 5t82, is fixed using a screw SCW from the outside.

This improves maintainability, that is, the cell can be easily attached and detached, the window glass can be easily attached and detached for cleaning, the nozzle can be easily attached and detached, and the liquid Q is ejected as shown by the arrow η. The direction is definitely determined (towards the window glass).

(■) Optical means 7a, 7d, 7e, and the first optical means in FIG.
Optical means in Figure 2? The mirror fixing structure in structures such as a, 7a2, etc. can be as shown in FIGS. 13 to 11 below. Although the optical means 7d will be explained here as a representative number, it goes without saying that the same applies to the other optical means.

13 to 14 are diagrams for explaining the mirror fixing structure of the optical means, and FIGS. 15 to 17 are diagrams of the improved mirror fixing structure of FIG. 13.

Generally, the 13th mirror fixing structure 7d of the optical means is
A block 7d made of aluminum or the like having a structure as shown in the figure, that is, an L-shaped structure, is used, and a fixing screw N is connected to a base plate (not shown) through a screw hole 7d provided at the bottom of the block 7d. The mirror He is pressed against the mirror fixing portion 7d2 provided on the back surface of the block 7do by a mirror fixing plate 7d3 made of iron or aluminum, for example, through a spacer SP made of rubber, etc., and then the mirror fixing screw is fixed. Child 7d.

The one that is fixed is used.

By the way, in this structure, if the materials of the mirror fixing plate 7d3 and the block 7do are different, the temperature will not be adjusted, as a matter of course, in an environment where the mirror fixing plate 7d3 and the block 7do are used in the field, such as this device. Due to the difference in coefficient of thermal expansion when subjected to temperature changes of ~60°C, the block is distorted as shown in Figure 14 (A> to (B)), resulting in mirror H.
In addition, the block requires a certain level of strength (weak strength results in lack of stability against external forces), and aluminum is generally used in terms of weight and workability, but this This causes an increase in costs.

Therefore, in order to solve this problem, we created a mirror fixing structure that is not affected by temperature and does not require temperature control, is made of sheet metal, etc., has sufficient strength, and has a good balance of weight and cost reduction. In the apparatus of the present invention, a structure as shown in FIGS. 15 to 17 is used. Note that parts that overlap with those in FIG. 13 are given the same numbers and their explanations will be omitted. In the exploded structure diagram in Fig. 15, the same figure (A> is a front view, the same figure (B) is a right side view, the same figure (C)
) shows a back view, and (D) shows a top view.

In FIGS. 15(A) to 15(D), 70d is a mirror fixed structure. In the mirror fixing structure 70d, 7
0d is a bracket made of sheet metal or the like (hereinafter referred to as "sheet metal bracket"), and this sheet metal bracket 70d is a mirror formed by press protrusion, for example, for determining the mirror position. pin 70
d2 are provided on four sides, for example, and when viewed from the front, the inside has an L-shaped structure, and when viewed from the side, it has an inverted T-shaped structure, and a screw hole 70d3 is provided at the bottom of the base plate (not shown). Fixed. 706a is made of the same kind of member as the sheet metal bracket, and is attached to the back surface of the bracket to prevent the mirror He from easily separating from the sheet metal bracket, to cope with changes in fixing pressure due to expansion of the mirror, and to easily lock the mirror He. For example, it is a stopper made of sheet metal or the like (here, a sheet metal hook type stopper) with a hook portion 70d41 at the top (with a relief), and this hook portion locks onto the bracket to reduce pressure changes and prevents the mirror from changing. A sponge 70d5 is applied to press and fix the mirror to the back surface of the bracket so that the mirror does not shift, and then a fixing screw 70d at the bottom part 70da2 is used to fix the mirror to the bracket, thereby fixing the mirror. At this time, by using the same material for the bracket and the stopper, it is possible to eliminate deformation of the bracket due to thermal expansion, and with this structure, one fixing screw 70d42 can be attached to the bracket through the stopper. The mirror can be fixed so as to be pressed against it, and it can also be shaped so that it is less likely to bend forward or backward or from side to side than the mirror surface, in other words, it is less likely to be distorted. At this time, the stoppers may be attached to the brackets 1 to 1 with their positions reversed (the hook portion is attached and fixed at the bottom, and the fixing screw is attached and fixed at the top of the bracket).

By the way, since the structure shown in FIG. 13 is a fixed structure in which the position of the mirror cannot be adjusted, the mirror structure (for example, the rotation center of a round mirror) whose angle can be adjusted by a support mechanism provided on the rotation center axis is conventionally known. Since it is not possible to adjust the angle of the mirror like in the case where the shaft is supported at one point using adjustment screws etc. from both sides of the U-shaped arm, it is not possible to adjust the angle of the mirror. In such a case, adjustment is required, for example, by using a spacer. Therefore, in such a case, a modified structure as shown in FIGS. 16 and 17 based on FIG. 15 is used. Fig. 16 is an exploded perspective view, Fig. 17 is an overall exploded view, (A) is a front view, (B) is a right side view, (C) is a back view, and (D) ) shows a top view (in the description, parts that overlap with those in FIG. 15 will be given the same numbers and the description thereof will be omitted).

In FIGS. 16 and 17, 70d2 is a mirror fixing structure. In this mirror fixing structure 70d2, 1
00 is a support body (bracket) that supports a mirror fixing part 400 having a concave structure for fixing a mirror 2 such as a concave mirror with an angle-adjustable structure.

At this time, the mirror fixing part 400 is provided with a mirror positioning pin 11 at the bottom for determining the mirror position, and the N part 4
00a, 400b have a concave structure in which fastening portions 400d+, 400d2 of at least 62fli are provided, while the support body 100 has at least one (right side in FIG. 16) side portion 100bA (the other side portion). 10
0bs), the bottom 100a and its side 100bA
In order to give flexibility to the outer fII1100bA+ (inner side is 100bA2) of the side part 10obA that directly supports the mirror fixing part 400 by partially separating the
00c is provided.

In order to support the mirror fixing #400 in an angle-adjustable manner, the support body 100 is provided with at least two fastening portions 10.
0d+, 100d2 are provided, of which the fastening part 1
00d is provided at the outer side 100tlA+. Fastening portion 4 of mirror fixing portion side surfaces 400a and 400b with concave structure
00d, , 400d2 are the support side fastening parts 10 (ld
+, located at two locations corresponding to 100d2. Then, for example, the fixing screw 120 serving as a fastening means is used to fasten both fastening parts from the inside (or outside) of the mirror fixing part.
At least one of d, , 100d2 is partially separated from the bottom 100a-side inner side 100b2 which becomes the support body, and the mirror fixing 1g400 and the support 100 are at least #J21! It is concluded at the i connection point.

After the mirror fixing part 400 and the support body 100 are fastened in this way, the mirror angle ω of the mirror fixing part 400 can be adjusted using the mirror adjustment screw hole 100e provided in the support body 100.
and a mirror adjustment screw hole 4 provided in the mirror fixing part 400.
This can be done by inserting a mirror adjustment screw 60 between the spring 70 provided between 00e and the support/mirror fixing part.

By supporting the mirror fixing part with two fastening points as described above, the mirror fixing part can be rotated.
The mirror angle can be adjusted, and since one of the fastening parts on the support side is partially separated from the main body, there is flexibility in the fastening direction, so the mirror fixing part and the support can be fastened easily. , it is also structurally stable. Further, with such a structure, there is no need to make the dimensional accuracy of the fastening portion between the mirror fixing portion and the support body strict, so that the product can be made at a lower cost.

<Effects of the Invention> As described above, the present invention is configured with one light source/two optical paths/one detector, and therefore has the following effects.

(2): By flowing the same sample liquid into cells of different lengths, the window surfaces become dirty in the same way, so the attenuation of transmitted light due to this dirt is the same for both cells. Therefore, by taking the ratio of the transmitted light of both cells, the decrease in transmittance due to dirt can be canceled.

■: Since it is composed of 1 light source/2 optical paths/1 detector, the measurement results are not affected by dirt (resistant to dirt), are not affected by brightness fluctuations of the light source, and are sensitive to the detector. Unaffected by change.

■: By configuring as shown in FIG. 2, turbidity can be measured using light in a wavelength band that is not absorbed by the component to be measured.

■: As shown in Figures 3 to 5, when the same filter is used for the measurement light and comparison light, variations due to the filter (
Temperature compensation, chromaticity, and turbidity can be measured using two wavelengths using two filters as in this case.

Furthermore, since the structure is such that multiple filters can be used, absorbance at multiple wavelengths can be measured, which is effective for measuring interference components.

On the other hand, light in the wavelength band used to measure target components is also scattered by turbidity, but the rate is the same as in turbidity measurement, so the transmittance at the time of turbidity measurement is used to measure the component. By dividing the transmittance of , the transmittance of the target component alone can be obtained, and the influence of turbidity can be easily canceled.

■: If you have a manual setting device for the turbidity compensation coefficient and configure it so that you can set the coefficient value according to the type of turbidity in the sample to be measured, you can adjust the value according to the actual turbidity in the process. Temperature compensation provides more accurate chromaticity measurements.

■Since the lamp rotation direction position is determined by the slit cut in the two-pump clamp part, the lamp position can be easily determined by aligning the filament position with the filament positioning hole.

■: Improved maintainability by using a nozzle connector and a pair of cell fixing brackets.

That is, the cell can be easily attached and detached, the window glass can be attached and detached, and the nozzle can be attached and detached easily, and the direction in which liquid is ejected from the squeezing nozzle can be easily and reliably determined.

■: Regarding the mirror fixed elliptical structure, the structure shown in Figs. 13 and 15 to 17 can be made to be less susceptible to temperature changes, and since it can be made from sheet metal, the weight of this part can be reduced, and it can be machined. It is possible to reduce costs, widen the range of material selection, and because it has a structure that can be fastened with a single screw without being hung with a hook, it is naturally extremely easy to assemble, improving workability and improving productivity. If you change it, you can shorten the work time, it can easily be used with equipment where temperature control is not possible, it can be made structurally stable at low cost, and the Mira fixing part can be rotated f! The lI construction makes it possible to adjust the mirror angle, and since it is flexible in the fastening direction, the mirror fixing part and the support can be fastened easily, making it structurally stable. Since there is no need to impose strict dimensional accuracy on parts, inexpensive products can be produced.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an absorption photometer showing a specific embodiment of the present invention, FIG. 2 is a schematic configuration diagram of an absorption photometer showing another specific embodiment of the present invention, and FIG. Schematic configuration diagram of an absorption photometer showing other specific embodiments of the present invention, No. 4
The figures are for explanation of Fig. 3, Fig. 5 is a drawing showing the specific arrangement and structure of Fig. 3, Fig. 6 is a configuration diagram showing an example of the turbidity compensation setting device, and Fig. 7 The figure shows the influence of spring water on Ice absorbance, Figure 8 is a diagram for explaining the lamp fixing structure, Figure 9 is a diagram showing a specific example of the lamp fixing structure used in the present invention, FIG. 10 is a diagram for explaining the structure of the arrangement example in FIG. 5, FIG. 11 is a diagram for explaining the problems in FIG. 10, and FIG. 12 is a diagram for explaining the present invention that solves the problems in FIG. 13 to 14 are diagrams for explaining the mirror fixing structure of the optical means, and FIGS. 15 to 17 are the improved mirror fixing structure of FIG. 13. Figure, No. 18
The figure is a schematic configuration diagram of a conventional spectrophotometer, and Figure 19 is a diagram of the 18th
1 is a schematic configuration diagram of a conventional spectrophotometer that is an improved version of the diagram. [B□, IB2...Light source device, 3...Measurement cell (measurement cell>, 4, 4a, 4b, 4c, 4d,
=-7 irta, 5, 5a. 51a...Detector, 6,60...Arithmetic circuit, 9...
Comparison cell, 80...Disc, 7d, 7e...Condensing optical means, 10...Position detector (photointerlager for position detection). Fig. 1 Fig. 2 Fig. 6) ( ) 60c2 (knob) 7 L Turbidity (△) (B) ( ) (B) Atmosphere 9 (△ ( ) (C゛)゛8 H 132nd 4th (A ) (B) ( ) ( ) (N 5] ( ) '70d1 ( ) (A) (B) (C)

Claims (2)

[Claims] (1) A measurement cell configured with a cell having an entrance window and a light exit window at the front and back and having a predetermined optical path length capable of filling the interior with a sample liquid, a light source device that irradiates light to the entrance window; A detector that measures the transmitted intensity of light passing through the cell and from the light exit window, and an arithmetic circuit that calculates the chromaticity and turbidity, or the chromaticity or turbidity, of the sample liquid based on the signal from the detector. A spectrophotometer is equipped with a cell having an optical path length different from that of the measurement cell, with an entrance window and a light exit window provided at the front and rear, and a cell having an optical path length different from that of the measurement cell; a comparison cell coupled to the measurement cell so as to be able to fill the measurement cell; means for directing light from the light source device to the measurement cell or to the comparison cell, or to an entrance window of the measurement cell and the comparison cell; A shutter that passes through or blocks the comparison light that passes through the comparison cell and is emitted from the light exit window, or a shutter that is placed after the light exit windows of the measurement cell and the comparison cell and is capable of selecting a wavelength. or more filters can be assembled, and the plane is perpendicular to the optical axes of the light beams from the measurement cell and the comparison cell, and the center of rotation is at a position equal to the distance from the two optical axes. a filter installed in front of the light-receiving surface of the detector when a filter assembled on the disc is not provided; means for guiding the comparison light or the comparison light and measurement light to the detector; An absorptiometer that measures the sample liquid based on the light that has passed through the measurement cell and the light that has passed through the comparison cell. (2) In the spectrophotometer according to claim 1, a mechanism for manually setting the turbidity compensation amount is provided, a signal from the mechanism is guided to the arithmetic circuit, and a signal from the mechanism is guided to the arithmetic circuit when measuring chromaticity. A spectrophotometer characterized in that the arithmetic circuit performs calculations according to the type of suspended matter in the sample based on the signal.