JPS59143939A - Continuous haze-value measuring device - Google Patents

Abstract

PURPOSE:To perform continuous measurement accurately, by providing a white standard plate, which is fixed on a moving table provided on the output side of light rays, a light trap, which absorbs the light, a motor driving part, which alternately replaces the white standard plate and the light trap, a timer, a microcomputer, and a device, which automatically prints out the measured result; and repeatedly measuring a sample to be measured, which is changed with the elapse of time at every specified time interval. CONSTITUTION:Inputted light is absorbed by a light trap 18, under the state (a) a sample is not inputted, and an output T0 of a light receiving device 16 at this time is stored in a computer. A white standard plate 15 is set in a light path in place of the light trap 18 (b), and an output T100 at this time is stored in the computer. The T0 and T100 are measured once at the first time of a series of sample measurements by standard aligning operation. Under the state (c) a sample to be measured 17 is set, the white standard plate 15 is in the light path, and an output Tt0 at this time is stored in the microcomputer. The light trap 18 is in the light path under the state (d), and an output Td0 at this time is stored in the microcomputer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously measuring the haze value of a sample that changes over time.

Conventional haze value measuring equipment has an optical system as shown in Figure 1, but this optical system is not designed to perform continuous measurements. The line must be entered manually each time. In Figure 1, light from a light source 1 passes through a lens 2, an aperture 3, and a lens 2' to form parallel rays. First, this parallel light beam is made to enter the integrating sphere 5 without the sample 4 placed thereon, and the diffusely reflected light from the white standard plate 6 is received by the light receiver 8 to perform 100 alignments. The white standard plate is manually placed at the position indicated by the one-dot chain line to allow the light trap 7 to absorb light and zero the light receiver 8. At the same time, another light receiver 9 is aligned 100 times. Next, place the sample and
Measure the diffuse transmittance (Td) with the receiver 9, measure the parallel transmittance (Tp) with the receiver 9, and calculate the haze value H=Td.
/(Td+Tp)×100 was calculated.

The conventional method requires two receivers, making it difficult to obtain receivers with exactly the same characteristics. The problem was that the relationship between the two haze values affected the haze value. That is, if the light receiver is large, it will receive not only parallel light but also diffused light from the sample, whereas if it is small, it will not receive enough parallel light from the sample. Also, if you want to perform continuous measurements with the conventional one,
It is complicated to manually switch the standard plate each time a measurement is made.

The present invention eliminates such drawbacks and enables continuous measurements to be carried out with high precision. Fig. 2 shows a sectional view of the optical system, and Fig. 3 shows the standard plate moving device portion seen from the side. In FIG. 2, a light source 1, lenses 2 and 2', and an aperture 3 obtain parallel light rays in the same manner as in the prior art. The integrating sphere 11 has three holes 12,
13 and 14, 12 and 13 face each other, and the light from 12 passes through 13 and enters the standard plate 15, and the reflected light is integrated within the integrating sphere and received by the light receiver 16. 17 indicates a measurement sample.

Reference numeral 18 is a box-shaped light trap whose inner surface is painted black to absorb light and is fixed to the moving table 19, and 20 is a motor for moving the moving table. Reference numerals 21 and 21' indicate rack and pinion gears for horizontally moving the movable table by rotation of the motor.

Regarding the explanation of the moving device part, referring to FIG. 3, the moving table 19
Fix the linear ball bearing 22 to the corner of 2
Slide the book on the slide bar 23. The rotation of the motor is controlled by rack pinions 21 and 21' to move the moving table in the horizontal direction, and the stop position of the moving table is set by a micro switch 24,
At the position 24, the optical axis coincides with the white standard plate 15, and at the position 24', the optical axis coincides with the light trap 18.

The movable table has a hole 25 which is slightly larger than the hole 13 of the integrating sphere so that sufficient light can enter the trap. FIG. 3 shows the position where the optical axis coincides with the moving platform hole 25, and the circle indicated by a dotted line on the left indicates the white standard plate 15. A column 26 is fixed to the device base 27 to fix the slide rod 23.

Next, a block diagram of this device is shown in FIG. In FIG. 4, the frame 28 surrounded by dotted lines is the optical system part, and 29
29 is a motor, 29' is a position detection section, and 30 is a light receiver.

The output from the light receiver 30 is amplified by an amplifier 31, converted to a digital signal by an analog-to-digital converter 32, and connected to a microcomputer 33. 34 is a timer for determining the measurement interval, and a digital or motor timer is used. A switch circuit 35 includes switches necessary for measurement operations. 36 is a printer that outputs the measurement results.

The operation of this device will be explained with reference to FIG. In FIG. 5(A), the incident light is absorbed by the light trap 18 without a sample inserted, and the output T0 of the light receiver 16 at this time is stored in the computer. In (b), a white standard plate 15 is set in the optical path instead of the light trap 18, and the output at this time is stored in the computer as T100. T0 and T100 are standard matching operations that are performed once at the beginning of a series of measurement samples.

Figures 5 (c) and (d) show the state when the measurement sample 17 is set, (c) shows the white standard plate 15 in the optical path and the output Tt0 at this time, and (d) shows the light trap 18 in the optical path. The output Td0 at this time is stored in each microcomputer. By performing the following calculations on a microcomputer, conventionally required measurement values can be easily obtained, and the results are output to the printer 36.

K=100/T100 T3=T0×KT4=Td0×
K Total light transmittance Tt=Tt0×K Diffuse light transmittance Td=T4-T3 (Tt/100) Parallel light transmittance Tp=Tt-Td Haze value H=Td/Tt×100(%) K in the above equation Conventionally, the output of the amplifier was adjusted so that T100 = 100 in the condition shown in Figure 5 (b), but with this device, no adjustment is made, and the output of the amplifier is directly input to the microcomputer. , the correction coefficient K is calculated so as to process this as 100.

In the case of continuous measurement, such as when observing changes over time in a sample, when the measurement switch is input using a timer, the states shown in FIGS. 5(B) and 5(C) are alternately switched and data is captured. That is, the state is determined by the position detection switches 24 and 24' in FIG. 3, and when the measurement switch is input in the state (c), Tt0 is read, and then the state is switched to the state (d) and Td0 is read.

Conversely, if the measurement switch is input in state (d), Td0
After reading Tt0, the state changes to state (c) and Tt0 is read.

In this manner, the present invention allows automatic measurement to be easily performed using only the measurement start signal from the timer. By using this device, it is possible to continuously measure the haze value of suspended solids in a solution sample as they precipitate over time, and to detect ultraviolet rays from optical glass whose color changes when irradiated with ultraviolet rays. It is now possible to continuously measure the state of transmittance recovery after removal.

As explained above, the present invention eliminates the drawbacks of conventional devices, simplifies measurement operations through arithmetic control by a microcomputer, improves accuracy through digital calculations, and enables automatic measurement. It can also be used for other purposes.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the optical system of a conventional device, FIG. 2 is a cross-sectional view of the optical system of the present invention, FIG. 3 is a side view of the standard plate moving device of the present invention, and FIG. 4 is a cross-sectional view of the optical system of the present invention. The block diagram of the apparatus, FIG. 5, is an explanatory diagram of the measurement sequence.

Claims (1)

[Claims] In a haze value measuring device using an integrating sphere, a white standard plate and a light trap that absorb light are fixed on a movable table installed on the exit side of the light beam, and the white standard plate and light trap are automatically alternated. A motor drive unit that can be replaced with a motor drive unit, a timer that repeatedly performs measurements at fixed intervals, a microcomputer that controls measurement operations and calculates measured values, and a device that automatically prints out measurement results. 1. A continuous haze value measurement device characterized by being configured such that a measurement sample that changes over time can be repeatedly measured at regular intervals.