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Total internal reflection type refractive index sensing method not affected by light source drift

A technology of total internal reflection and sensing method, which is applied in the field of high-precision measurement of the refractive index of liquid materials, can solve problems affecting measurement results, achieve high sensitivity, improve measurement accuracy and stability

Active Publication Date: 2019-07-23
NANKAI UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the drift of the light source intensity will seriously affect the measurement results, and to provide a total internal reflection refractive index sensing method that is not affected by the drift of the light source

Method used

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  • Total internal reflection type refractive index sensing method not affected by light source drift
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  • Total internal reflection type refractive index sensing method not affected by light source drift

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Embodiment 1

[0024] Step 1. First build the experimental device of the total internal reflection refractive index sensing method that is not affected by the drift of the light source

[0025] as attached figure 1 As shown, the laser 1 adopts a laser with a wavelength of 532nm, and the output power is 5mw. The light intensity modulator 2 adopts a mechanical rotary chopper with a modulation frequency of 2000 rpm. The 1 / 4 wave plate 3 is installed on a high-precision rotary translation stage Above (omitted in the figure), the resolution of the rotary translation stage is 1 arcsec, and the bidirectional repetition rate is 10 arcsec. The biorefractive index sensor consists of a prism 6, graphene 7 and a microfluidic chamber 8. The refractive index of the prism is 1.517. 10 layers of graphene are prepared by CVD, and the microfluidic chamber is made by PDMS injection molding. The measured liquid medium material 9 passes through The catheter is connected to the microfluidic pump and injected int...

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Abstract

The invention provides a total internal reflection type refractive index sensing method not affected by light source drift. The invention proposes the total internal reflection type refractive index sensing method in which the influence of the light source drift can be completely eliminated for the first time, the requirements for the stability of the light source are reduced, and the measurementprecision are improved. The method is as follows: before the incident light enters a sensor, incident light passes through a light intensity modulator and a quarter-wave plate, a light intensity differential signal output by the sensor is measured, an optical axis angle of the quarter-wave plate is accurately adjusted to minimize or remove an AC signal in the differential signal, when the refractive index of the measured liquid changes, the AC signal of the differential signal becomes larger, by accurately adjusting the optical axis angle of the quarter-wave plate, the AC signal in the differential signal is minimized or removed, and the refractive index of the measured medium is determined according to a corresponding relationship between the rotation angle of the quarter-wave plate and the change in the refractive index.

Description

technical field [0001] The invention relates to the fields of biomedical detection, material property detection and the like, and is mainly applied to measuring the refractive index of liquid materials with high precision. Background technique [0002] Optical biorefractive index sensors are widely used in the detection of specificity, sensitivity and stability of biological samples. The refractive index sensor based on the polarization selective absorption characteristics of graphene generally adopts the measurement method of total internal reflection, by measuring the difference result of the reflected light intensity of the graphene material for P-polarized light and S-polarized light after total internal reflection, to measure the difference with graphene The refractive index of the medium in contact. However, due to the light intensity differential measurement method currently used, the drift of the light source intensity will seriously affect the measurement results. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G01N21/43
CPCG01N21/41G01N21/4133G01N21/43
Inventor 杨勇张慧琴吴晓静刘璐杨艺哲方晖朱思伟袁小聪
Owner NANKAI UNIV
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