3D micro-lens cascade type chip refractive index sensor

Abstract

The invention discloses a 3D micro-lens cascade type chip refractive index sensor, which is used for measuring the refractive index of a sample to be measured, and comprises a chip, an LED light source, an incident optical fiber, an emergent optical fiber and a detector, the chip is internally provided with a sample inlet, a sample outlet, a micro-channel and a plurality of detection channels; wherein the micro-channel is connected in series between the sample inlet and the sample outlet, so that a sample to be detected flows through the micro-channel from the sample inlet and flows out from the sample outlet; each detection channel is composed of an incident optical fiber groove, an emergent optical fiber groove and a 3D micro-lens cavity formed in the micro-channel, and when the 3D micro-lens cavity is filled with a sample to be detected, the sample to be detected in the 3D micro-lens cavity forms a 3D micro-lens; the numbers of the 3D micro-lens cavities in different detection channels are different, and the 3D micro-lens cavities in the same detection channel are arranged in a cascade manner. According to the sensor, multi-range refractive index detection can be achieved, the detection limit is low, the production cost is low, and machining is convenient and fast.

Description

technical field [0001] The invention relates to the technical field of optical detection and analysis, in particular to a 3D microlens cascaded chip refractive index sensor. Background technique [0002] Refractive index is a fundamental optical property of matter and is widely used in the metrological analysis of non-fluorescence and non-absorbing samples. The refractive index method is widely used in real-time monitoring of solution ratios in industrial ingredients, alcohol content analysis and sugar content analysis in the food and beverage industry, salinity measurement in seawater environmental quality monitoring, and urine specific gravity analysis in health management. [0003] Commonly used handheld liquid refractometers are low in cost, but their resolution is low, and they are not suitable for real-time detection of the refractive index of flowing samples. Microfluidic chip technology is an emerging technology that has emerged in the past 20 to 30 years. Microflui...

AI Technical Summary

Problems solved by technology

[0006] In actual use, there are many types of samples to be tested for the refractive index, and the range of the refractive index is widely distributed. The existing refractive index sensors usually adopt a single-channel single-range design, which cannot meet the wide application of various detection requirements.

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