Concentration measuring device

Abstract

To accurately measure concentration of each gas and the like in a solute or mixture gas to be dissolved in various kinds of solutions like an aqueous solution by a simple configuration.SOLUTION: A detector 200 comprises: a piping holding part that holds translucent piping flowing a measurement object of concentration; and an optical system that makes light output from a first optical fiber 201 incident upon customer piping 300, makes the measurement object pass through, makes the light exit from the customer piping 300, and inputs the light to a second optical fiber 202. A converter 100 includes: a light projection unit 101 that has an LED 180; a spectroscopic unit 102 that spectroscopically splits light generated from the light projection unit 101, and outputted via the first optical fiber 201, the optical system and the second optical fiber 202; and a computation unit 114 that obtains the concentration of the measurement object on the basis of intensity of the light split by the spectroscopic unit 102.SELECTED DRAWING: Figure 1

Claims

1. A concentration measuring device having a converter, a detector, a light emission path connecting the converter and the detector, and a light receiving path, The detector is It does not contain electronic components, A pipe clamping part that is attached to a light-transmitting pipe through which the substance to be measured for concentration flows, The system includes an optical system housed inside the pipe clamping section, which receives light output from the light emission path, causes it to enter the pipe, pass through the object to be measured, emits it from the pipe, and inputs it to the light receiving path. The aforementioned converter is A light-emitting unit having an LED (Light Emitting Diode) as a light source, A spectrometer that spectrally analyzes the light generated from the light-emitting unit and output via the light-emitting path, the optical system, and the light-receiving path, The system comprises a calculation unit that determines the concentration of the object to be measured based on the intensity of the light spectrally separated by the spectral unit, The aforementioned arithmetic unit, Dark spectrum, The light-emitting element characteristics of the light-emitting unit, Spectrometer characteristics of the aforementioned spectrometer section, The forward voltage of the light-emitting element in the light-emitting unit, and Temperature inside the converter The spectrum obtained by the spectrometer is corrected using the above-mentioned method. The absorbance spectrum is calculated from the corrected spectrum. The concentration of the object to be measured is calculated by applying the absorbance spectrum to the regression equation. A concentration measuring device characterized by the following features.

2. The concentration measuring device according to claim 1, characterized in that the pipe clamping portion comprises a case and a tube cover, and the case and tube cover are fixed to each other while clamping the pipe between them.

3. The case has a tube holder mounted on the surface facing the tube cover. The concentration measuring device according to claim 2, characterized in that the tube cover clamps the piping between itself and the tube holder mounted on the case.

4. The aforementioned case is, A housing that houses the optical system and has an opening that includes an inlet path and an outlet path to the optical system, A cover is positioned and fixed to cover the opening of the housing, and connects the light emission path and the light receiving path to the optical path of the optical system. The concentration measuring device according to claim 2 or 3, characterized by comprising the following:

5. The optical system includes a light-emitting mirror that reflects light from the light-emitting path and causes it to pass through the pipe, A light-receiving mirror that reflects the light that has passed through the aforementioned pipe and directs it toward the light-receiving path, A concentration measuring device according to any one of claims 1 to 4, characterized by comprising the above.

6. The density measuring device according to claim 5, characterized in that the optical system has a light emission direction parallel to the light incidence direction from the light emission path.

7. The concentration measuring device according to any one of claims 1 to 6, characterized in that the spectroscopic unit has a grating-type spectrometer.

Images