Sensor and method for detecting refractive index of liquid in micro-fluid system
A technology of liquid refractive index and microfluidic system is applied in the field of optical waveguide devices and sensors for detecting the refractive index of liquids in microfluidic systems. and stability, simplify the testing process, and make the production process simple.
Inactive Publication Date: 2015-03-04
HUNAN NORMAL UNIVERSITY
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Problems solved by technology
Usually, liquid refractive index measurement methods include photometry, ellipsometry, prism coupling method, etc. However, these methods have disadvantages such as complex structure, difficult design and manufacture, poor control stability, and are easily affected by external environmental factors. The direction is not in the same plane as the microfluidic plane, making it difficult to achieve effective integration of the microfluidic system and the optical system
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[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0035] Such as Figure 1-Figure 3 As shown, a sensor for detecting the refractive index of a liquid in a microfluidic system includes an upper substrate 10, a lower substrate 11, a cladding material layer 1, an S-shaped deflection waveguide, and a microfluidic channel 7;
[0036] The cladding material layer 1 is located between the upper substrate 10 and the lower substrate 11;
[0037] The S-shaped deflected waveguide and the microfluidic channel 7 are located in the cladding material layer 1;
[0038] The microfluidic channel is provided with a fluid input port 8 and a fluid output port 9;
[0039] The S-shaped deflected waveguide is made of core material, including sequentially connected optical input straight waveguide 2, first deflected waveguide 3, second deflected waveguide 4, third deflected waveguide 5, and optical output straight waveguide 6...
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Abstract
The invention discloses a sensor and a method for detecting the refractive index of liquid in a micro-fluid system. The sensor is a novel functional device which is used in the micro-fluid system, and the size of output light power is changed under the influence of the refractive index of the liquid by utilizing the transmission and reflection degrees of a light beam in a wave guide at the interface position between the wave guide and a micro-fluid channel, so that the size of the refractive index of the liquid can be indirectly determined according to the output size of the light power. By ingeniously combining the basic principle, the sensor has the advantages that the light wave guide and the micro-fluid channel have a simple planar structure, the manufacturing process is simple, the refractive index of the liquid is convenient to test, and optical devices and micro-fluid functional devices can be integrated; according to the detection method, in the process of detecting the refractive index of the liquid by utilizing the sensor, the fluid channel is coplanar to a light path, and the testing process is greatly simplified; moreover, the testing process is slightly affected by an external environment due to co-planarity, so that the detection accuracy and the stability are improved.
Description
technical field [0001] The invention belongs to the field of microfluidic photonics and integrated optics, relates to an optical waveguide device, in particular to a sensor and method for detecting the refractive index of liquid in a microfluidic system. Background technique [0002] The microfluidic system integrates the basic operation units such as sample preparation, reaction, separation, and detection involved in the fields of chemistry and biology into a small chip. A technical platform to replace various functions of conventional chemical or biological laboratories. Microfluidic chip (also known as lab-on-a-chip) is a typical representative of microfluidic system. Compared with traditional analysis technology, microfluidic chip technology is a "micro" and "complete" analysis technology platform, which has the advantages of small sample requirement, high separation efficiency, fast analysis speed, small equipment size, and high degree of automation. [0003] Microflu...
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Inventor 唐雄贵梁珊
Owner HUNAN NORMAL UNIVERSITY