Optical analysis device

An optical analysis device, comprising:

• a measuring cell having a flow channel for a substance to be measured to flow;
• a semiconductor light source that emits light with a wavelength compatible with an absorptivity of the substance to be measured;
• a transmission window that transmits light from the semiconductor light source;
• a transmitted light detector that detects transmitted light in the measuring cell, the transmitted light being the light coming from the semiconductor light source and passing through the transmission window;
• an incident light detector that detects incident light not passing through the measuring cell;
• a distributor that branches the light into the transmitted light and the incident light;
• a temperature measuring element that measures a state temperature of the semiconductor light source;
• a temperature sensor that measures temperature of the substance to be measured;
• a pressure sensor that measures pressure of the substance to be measured;
• and
• a drive unit that lights the semiconductor light source, wherein
• a characteristic coefficient of the semiconductor light source is stored in a memory in advance, and the absorptivity of the substance to be measured during measurement is computed in a computing unit by using detected temperature of the semiconductor light source from the temperature measuring element, and a concentration of the substance to be measured is calculated by absorptiometry.

An optical analysis device, comprising:

• a measuring cell having a flow channel for a substance to be measured to flow;
• a semiconductor light source that emits light with a wavelength compatible with an absorptivity of the substance to be measured;
• a transmission window that transmits light from the semiconductor light source;
• a transmitted light detector that detects transmitted light in the measuring cell, the transmitted light being the light coming from the semiconductor light source and passing through the transmission window;
• an incident light detector that detects incident light not passing through the measuring cell;
• a distributor that branches the light into the transmitted light and the incident light;
• a temperature sensor that measures temperature of the substance to be measured;
• a pressure sensor that measures pressure of the substance to be measured;
• and
• a drive unit that lights the semiconductor light source, wherein
• a characteristic coefficient of the semiconductor light source is stored in a memory in advance, the absorptivity of the substance to be measured during measurement is computed in a computing unit by using detected temperature of the semiconductor light source, and a concentration of the substance to be measured is calculated by absorptiometry.