New-Type Biosensor Based on Multiple Total-Internal Reflections in Heterodyne Interferometry

In this paper, a novel biosensor based on multiple total-internal reflections (MTIRs) in heterodyne interferometry (HI) is proposed. The biosensor is made of an elongated prism. As a heterodyne optical light source transmits through the new-type biosensor, it will undergo multiple total-internal reflections (MTIRs). Thus we can obtain the text signal at the output. The phase difference variation due to the different refractive indices of the tested media can be obtained by a Lock-In-amplifier (LIA). By some numerical calculations, we can achieve the related parameters of the tested medium. The resolution of the sensor can reach 4×10-7 refractive index unit (RIU). The electro-optical biosensor has some merits, easy operation, in real-time measurement, and high stability, etc.

Download Full-text

Ground-Based Videometric Method and System for the Real-Time Measurement of Aircraft Landing Track

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.635-637.824 ◽

2014 ◽

Vol 635-637 ◽

pp. 824-831 ◽

Cited By ~ 1

Author(s):

Xiang Zhou ◽

Zhi Hui Lei ◽

Dan Fu ◽

Xiao Hu Zhang

Keyword(s):

Real Time ◽

Global Positioning System ◽

Large Scale ◽

Time Measurement ◽

Landing Point ◽

The Real ◽

Aircraft Landing ◽

Real Time Measurement ◽

Global Positioning ◽

New Type

This paper proposes a ground-based videometric method and system for measuring the glide track of landing aircraft in real time. The proposed method is applicable for large-scale measurement via regional relays with multiple cameras. Its measurement ranges from kilometers away to the landing point, and it simultaneously fulfills the real-time measurement of the position and trajectory of aircraft. The real-time measurement result of the actual aircraft landing process shows a deviation from DGPS(Difference Global Positioning System) as small as 20 cm in the measuring region of 1 km. The proposed measurement method for aircraft landing track based on videometrics can establish a new type of landing aid system removed from radar and GPS.

Download Full-text

Real-time measurement of complex refractive indices with surface plasmon resonance

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2017.02.004 ◽

2017 ◽

Vol 245 ◽

pp. 747-752 ◽

Cited By ~ 7

Author(s):

Sandrine Filion-Côté ◽

Maryam Tabrizian ◽

Andrew G. Kirk

Keyword(s):

Surface Plasmon Resonance ◽

Real Time ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Time Measurement ◽

Refractive Indices ◽

Real Time Measurement

Download Full-text

Design of a Reflective Type Optical Fiber Sensor Based on Multiple Total-Internal Reflections Theory in Heterodyne Interferometry

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.811.463 ◽

2013 ◽

Vol 811 ◽

pp. 463-468

Author(s):

Shinn Fwu Wang ◽

Che Yu Liu ◽

Shyh Rong Lay ◽

Yi Chu ◽

Yu Pin Liao ◽

...

Keyword(s):

Optical Fiber ◽

Incident Angle ◽

Optical Fiber Sensor ◽

Measurement Range ◽

Fiber Sensor ◽

Heterodyne Interferometry ◽

Optical Source ◽

Biochemical Sensing ◽

Real Time Measurement ◽

Index Unit

In this paper, a reflective type optical fiber sensor (OFS) based on multiple total internal reflections in heterodyne interferometry is proposed. The sensor is made of a multimode optical fiber which cladding was removed and polished as a top shape. And the end surface of the sensor is designed as a micro-mirror. As a heterodyne optical source is launched into the optical fiber sensor at a suitable incident angle, we can obtain the phase difference between s-and p-polarizations at the output of the optical fiber sensor. By numerical simulation, it is clear that the resolution of the system by using the intensity method can reach refractive index unit (RIU) at least in the measurement range of. The OFS could be valuable for chemical, biological and biochemical sensing. It has some merits, such as, high resolution and stability, small size and real-time measurement.

Download Full-text