JPS59176653A - Integrating sphere type turbidimeter for continuous measurement - Google Patents

Abstract

PURPOSE:To take an accurate continuous mesurement of turbidity stably and easily by guiding light transmitted through a sample cell into an integrating sphere, and detecting separately the diffusion reflected light of totally transmitted light and the diffusion reflected light of scattered transmitted light and displaying the ratio of their outputs. CONSTITUTION:Parallel luminous flux projected by a light source 1 is made incident to the integrating sphere 3 through the sample cell 2 and an opening 4. Transmitted light except the scattered transmitted light enters a rotary sector 6 equipped with a diffusion reflecting part 9 and a gap part 10 through an opening 5, and light reflected by the reflection part 9 and scattered transmitted light are reflected repeatedly in the integrating sphere to enter a photodetector 8. The transmitted light incident to the gap part 10 of the rotary sector 6 through the opening 5 is absorbed by a trap 7 and only the scattering transmitted light is diffused and reflected repeatedly in the integrating sphere 3 to be mode incident to the photodetector 8. Both output signals from the photodetector 8 are separated by a changeover switch 22 and held by holding circuits 23 and 23, whose output ratio is calculated continuously and displayed on an indicator 21. Consequently, an accurate measurement of the turbid is taken stably and easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an integrating sphere turbidity meter for continuous measurement.

In general, the total transmitted light that passes through the sample to be measured includes scattered transmitted light caused by suspended particles in the sample to be measured.
Regarding the turbidity of the sample to be measured, the intensity of the diffusely reflected light within the integrating sphere with respect to the total transmitted light.However, with the conventional integrating sphere applied turbidity meter, trot continuously It was difficult to open the show.

The present invention aims to provide a turbidity meter for continuous measurement, which allows the continuous measurement of turbidity to be carried out stably and easily.

In order to achieve the above object, the continuous measuring sphere turbidity meter of the present invention has a sample cell in front (a parallel light source that emits a parallel light beam) in which a sample to be measured is housed, and a diffuse reflection surface (6) At the same time, an integrating sphere having an entrance aperture and a transmission aperture through which a luminous flux enters and exits, a diffuse reflection section having a diffuse reflection surface, and a cavity are arranged alternately in the circumferential direction, and by rotation thereof, the above-mentioned transmission aperture is arranged. A rotating sector that opens and closes intermittently to switch the measurement mode and an optical trap that absorbs the luminous flux are sequentially arranged, and the output of the receiver is sent to a receiver attached to the integrating sphere that detects the intensity of the internal reflected light. , a circuit that separates output signals in each measurement mode of diffuse reflection of total transmitted light and diffuse reflection of scattered transmitted light based on a synchronization signal generated with the rotation of the rotating sector, and arithmetic processing circuit for the ratio thereof;
and an indicator that displays the performance IE results.

In the above continuous measurement integrating sphere turbidity meter, the measurement mode is continuously switched as the rotation sector rotates.
As a result, only the total transmitted light or the diffusely transmitted light is reflected within the integrating sphere (if it is diffusely reflected, the intensity of the reflected light due to 7 is continuously detected by the receiver, but these receiver outputs are detected by the rotating sector in the processing circuit). The output signal of each measurement mode is separated by a signal synchronized with the rotation, and the ratio of these signals is continuously calculated, and the calculated value is displayed on the indicator.

1. Therefore, according to the integrating sphere turbidity meter of the present invention, accurate continuous measurement of turbidity in a sample to be measured can be performed stably and easily with an extremely simple configuration.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

11 In FIG. 1, there is a parallel light source that emits an order of magnitude parallel light beam, and on the same axis in front of it there are a sample cell 2 in which the sample to be measured is accommodated, and an entrance aperture 4 through which the light beam enters and exits.
and an integrating sphere 3 having a transmission aperture 5, a rotating sector 6 that alternately switches between first and second measurement modes (measurement modes of diffuse reflection of total transmitted light and diffuse reflection of scattered transmitted light) by rotation, and a light An optical trap 7 is provided to absorb ql. The integrating sphere 3 is a hollow sphere whose inner surface is processed into a diffuse reflection surface, and a light receiver 8 is attached to the negative side thereof.

To switch the measurement mode mentioned above, the rotating sector 6 is connected to the integrating sphere 3.
This is carried out by intermittently opening and closing the transmission aperture 5, and the rotating sector 6 that realizes this closes the transmission aperture 5 to create the first measurement mode, as shown in Figure 1. A pair of quadrant-shaped diffuse reflection sections 9, 9 each having a diffuse reflection surface for the measurement, and a pair of quadrant-shaped diffuse reflection sections 9, 9 for creating a second measurement mode by opening the transmission aperture 5 of the na. The gap portions 10 are arranged alternately in the circumferential direction.

Accordingly, in the first measurement mode, the entrance aperture 4
The total transmitted light incident on the proportional division method 3 is reflected by the diffuse reflection section 9.
It is prevented from emitting from the transmission aperture 5 of the integrating sphere 3, and the diffuse reflection line returns within the integrating sphere 3, and in the second measurement mode, the scattering of the transmitted light is prevented. Excluding the transmitted light <m, the supercharged light passes through the integrating sphere 3 as it is, enters the optical trap 7, is absorbed by the optical trap 7, and from this K, only the scattered transmitted light repeatedly diffuses and reflects within the integrating sphere 3. When the intensity of those reflected lights is detected by the light receiver 8, it becomes K.

The shaft 12 fixed at the center of the rotary sector 6 is provided with a driven gear 13, and the driven gear 13 is meshed with a drive gear 14 fixed to the shaft of the motor 15, thereby causing the shaft 12, that is, the rotary sector 6 to rotate. Further, a synchronizing disk 16 is fixed to the shaft 12 of the rotating sector 6 to detect the rotation period, that is, the switching period of each measurement mode. A synchronizing signal generating circuit 17 provided near the periphery of the synchronizing disc 16 is for detecting the rotation period of the disc 16.

The light receiver 8 attached to the integrating sphere 3 is used to continuously detect the intensity of the diffusely reflected light inside the integrating sphere 3, regardless of whether the measurement mode is switched or not. Connected to the device 8 are a processing circuit 20 that processes signals detected thereby, and an indicator 21 that displays the processing results. 20 processing circuits, a changeover switch 22 connected to the light receiver 8, a hold circuit 23, 23, and a division circuit 2
4, the synchronous signal generation circuit 17 is connected to the changeover switch 22 and the hold circuits 23 and 23, respectively, and the synchronization signal is used to transmit the signal detected by the light receiver 8 to the changeover switch 22 for each measurement mode. The hold circuits 23 and 23 that separate the output signals and connect them hold each of the above-mentioned neutral signals until the next output signal is sent, and the next-stage division circuit 24 outputs these held outputs. The signal ratio is continuously calculated and the result of the calculation is continuously displayed on the indicator 21.

To use the turbidity meter having the above configuration, a parallel light beam from a parallel light source 1 is made to enter the sample meter 2 while the motor 15 is rotating the rotation sector 6 and the synchronization disk 16. In this case, the first and second measurement modes are alternately switched as the rotating sector 6 rotates, and in the first measurement mode, all transmitted light is diffusely reflected within the integrating sphere 3. In the second measurement mode, only the scattered transmitted light is diffusely reflected within the integrating sphere 3, so the intensity of the reflected light is detected by the light receiver 8. Ru. The output signal from the photoreceiver 8 produced by such detection is separated into the first and second measurement (output signals at the needle) by the changeover switch 22, and then sent to the hold circuit 23, respectively. 2
3K is sent in bold, and the ratio of the pair of signals, that is, the ratio of the output signal in the first measurement mode and the output signal in the second measurement mode, is continuously calculated by the division circuit 24 in the next stage. , the result will be displayed on the indicator. The value of the above ratio represents the turbidity of the threatened sample to be measured, so that the turbidity of the sample to be measured can be accurately and continuously measured.

ξIf the scale of the turbidity meter is calibrated using a turbidity standard substance, this turbidity meter can be used as a continuous turbidity meter with turbidity units based on the standard substance.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG. 3 is a front view of its rotating sector. DESCRIPTION OF SYMBOLS 1...Parallel light source, 2...Sample cell, 3...Integrating sphere, 4...Incidence aperture, 5...Transmission aperture,
6... Rotating sector, 7ψ... Optical trap,
8... Light receiver, 9... Diffuse reflection part, 1o... Gap part, 20... Processing circuit, 21... Indicator. Figure 2

Claims (1)

[Claims] 1 In front of the parallel light source that emits a parallel light beam, there is a sample cell in which the sample to be measured is housed, an integrating sphere whose inner surface is a diffuse reflection surface and an entrance aperture and a transmission aperture through which the light beam enters and exits, and a diffuse reflection Diffuse-reflecting portions with one surface and void portions are alternately distributed in the circumferential direction, and the above-mentioned transmission aperture is intermittently opened by rotating them! A rotating sector that closes to switch the measurement mode and an optical trap that absorbs the luminous flux are sequentially arranged.
The light receiving force is applied to a light receiver attached to the integrating sphere that detects the intensity of reflected light inside the integrating sphere, and diffuse reflection and scattered transmission of the total transmitted light are applied based on the synchronization signal generated with the rotation of the rotating sector. An integrating sphere type for continuous measurement, characterized in that it separates the diffuse reflection of light into output signals for each measurement mode, and is connected to an arithmetic processing circuit for their ratios and an indicator that displays the results of the arithmetic operations. Turbidity meter.