High precision liquid refractive index sensor

A technology of liquid refractive index and sensor, which is applied to the measurement of phase influence characteristics, etc., can solve the problems of low measurement accuracy, small sensor measurement range, complex device structure, etc., and achieve the effect of wide application prospects

Inactive Publication Date: 2018-11-13
HUNAN NORMAL UNIVERSITY
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, there are many methods for measuring the refractive index of liquids, such as Abbe refraction method, Michelson interferometry, surface plasmon method, etc., but these methods usually have disadvantages such as poor measurement accuracy, large environmental influence, or complex device structure.
[0003] In recent years, various liquid refractive index sensors based on grating structures have been proposed, such as waveguide grating liquid refractive index sensors, fiber grating liquid refractive index sensors, Bragg grating liquid refractive index sensors, etc. However, these sensors usually have measurement There are many outstanding problems such as small range, low measurement accuracy, or high cost, so it is subject to many restrictions in practical applications

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High precision liquid refractive index sensor
  • High precision liquid refractive index sensor
  • High precision liquid refractive index sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings. Here, near-infrared light is used as the incident light, its wavelength range is about 1525~1565nm, the polarization state is TM wave, the incident plane is on the x-z plane, and the incident angle θ 1°, the period of the grating T , groove depth H , step width d They are 0.60μm, 0.45μm, 0.45μm, pitch w is 0.80 μm. The substrate material is optical glass with a refractive index of 1.5. The grating dielectric material is single crystal silicon with a refractive index of 3.48.

[0018] Here, the performance of the liquid refractive index sensor provided by the present invention is simulated and analyzed by Fourier mode method. Here it is assumed that the range of the refractive index of the liquid to be measured is 1.33~1.41. The transmission spectrum of the sensor varies with the refractive index of the liquid as image 3 shown. Depend on image 3 It can be see...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
refractive indexaaaaaaaaaa
refractive indexaaaaaaaaaa
Login to view more

Abstract

The invention discloses a high precision liquid refractive index sensor based on a sub-wavelength optical grating structure, and belongs to the field of biophoton sensing. The high precision liquid refractive index sensor is composed of a substrate plate, a sub-wavelength optical grating, and a microfluid channel; the sub-wavelength optical grating guided-mode resonance is adopted to realize liquid refractive index high precision measuring. When the liquid refractive index in the microfluid channel is changed, the center wavelength of the transmission spectrum of the optical grating is changed, the center wavelength is firmly related with the value of liquid refractive index. The liquid refractive index can be obtained through measuring the transmission spectrum center wavelength. The highprecision liquid refractive index sensor is a novel sensor used for measuring liquid refractive index, is simple in structure, is convenient to prepare, is high in measuring precision, and is promising in application prospect in the fields of biological sensing, chemical analysis, and medical diagnosis.

Description

technical field [0001] The invention belongs to the technical field of biophoton sensing, and in particular relates to a high-precision liquid refractive index sensor. Background technique [0002] Liquid is one of the basic forms of matter in nature, and the refractive index of liquid is an important parameter reflecting the physical properties of liquid. The purity or concentration of a liquid usually has a direct impact on its refractive index, so obtaining the refractive index of a liquid quickly and accurately is of great significance for many fields such as chemical analysis, medical diagnosis, environmental monitoring, and food production. Generally, there are many methods for measuring the refractive index of liquids, such as Abbe refraction method, Michelson interferometry, surface plasmon method, etc., but these methods usually have disadvantages such as poor measurement accuracy, large environmental influence, or complex device structure. [0003] In recent years...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 唐雄贵毛强孟方陈明梁珊
Owner HUNAN NORMAL UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products