TY - JOUR
T1 - Refractive index measurement system of liquid based on surface plasmon resonance
AU - Chen, Qianghua
AU - Liu, Jinghai
AU - Luo, Huifu
AU - He, Yongxi
AU - Luo, Jun
AU - Wang, Feng
N1 - Publisher Copyright:
©, 2015, Chinese Optical Society. All right reserved.
PY - 2015/5/10
Y1 - 2015/5/10
N2 - Refractive index is an important parameter who indicates the material information. In chemistry, biology, medicine and other fields, the samples are usually made of low concentration solutions for chemical or physical reactions, from which various properties and parameters of the samples are determinated by detecting small changes of the refractive index of the solutions. So that, a kind of laser measurement method for liquid refractive index is presented based on surface plasmon resonance (SPR) and phase detection. The theoretical analyses indicate that the phase difference change between p and s polarization components of the reflected light is almost linear with the fluctuation of the refractive index at the range of 1.333~1.336. Thus the measurement equation is derived. Corresponding refractive index measurement system is built based on a heterodyne interference optical path using a dual-frequency laser. The system has strong anti-interference ability because of the common light path and high precision because of using phase measurement. The experimental results of measuring glycerine solution refractive index are consistent with the theoretical analysis, and agree with the results of another method, where the error between each other is less than 2.0×10-5. The method can be widely applied in the fields of biological detection, chemical analysis, medical diagnosis, pollution research and so on.
AB - Refractive index is an important parameter who indicates the material information. In chemistry, biology, medicine and other fields, the samples are usually made of low concentration solutions for chemical or physical reactions, from which various properties and parameters of the samples are determinated by detecting small changes of the refractive index of the solutions. So that, a kind of laser measurement method for liquid refractive index is presented based on surface plasmon resonance (SPR) and phase detection. The theoretical analyses indicate that the phase difference change between p and s polarization components of the reflected light is almost linear with the fluctuation of the refractive index at the range of 1.333~1.336. Thus the measurement equation is derived. Corresponding refractive index measurement system is built based on a heterodyne interference optical path using a dual-frequency laser. The system has strong anti-interference ability because of the common light path and high precision because of using phase measurement. The experimental results of measuring glycerine solution refractive index are consistent with the theoretical analysis, and agree with the results of another method, where the error between each other is less than 2.0×10-5. The method can be widely applied in the fields of biological detection, chemical analysis, medical diagnosis, pollution research and so on.
KW - Liquid refractive index
KW - Measurement
KW - Phase measurement
KW - Surface plasmon resonance
UR - http://www.scopus.com/inward/record.url?scp=84932117645&partnerID=8YFLogxK
U2 - 10.3788/AOS201535.0512002
DO - 10.3788/AOS201535.0512002
M3 - Article
AN - SCOPUS:84932117645
SN - 0253-2239
VL - 35
JO - Guangxue Xuebao/Acta Optica Sinica
JF - Guangxue Xuebao/Acta Optica Sinica
IS - 5
M1 - 0512002
ER -