KEYWORDS: Optical filters, Spectrometers, Light sources, Sensors, Near infrared spectroscopy, Signal to noise ratio, Liquids, Near infrared, Absorption, Optical design
The near-infrared spectrum is very practical for real-time analyzing in the field of industry. This paper describes the
structure of optical system, which is a part of the well logging instruments. The optical system is designed to analyze the
composition of underground fluid, using the differences between oil and water in near-infrared absorption. Using Beer-
Lambert law, the article analyzes the light intensity when broad-spectrum light passes through the liquid. According to
the results of analysis, a group of wavelength including center wavelength and bandwidth can be selected. With each selected wavelength, light intensity changes significantly as the concentration of liquid changes. By measuring the light intensity, the system can analyse the composition of underground fluid.
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