A High Sensitivity and Wide Dynamic Range Fiber-Optic Sensor for Low-Concentration VOC Gas Detection

Khan, Md. Rajibur Rahaman; Kang, Shin‐Won

doi:10.3390/s141223321

Cited by 30 publications

(18 citation statements)

References 40 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It consists of a test chamber, four interdigitated taste sensing elements, one reference IDC element, a signal processing unit, an oscilloscope (TDS3032B, Tektronix, Wilsonville, OR, USA), a multifunction data acquisition (DAQ) module (NI USB-6216 BNC, National Instruments, Debrecen, Hungary) and a PC. The signal processing unit is primarily divided into five parts: an oscillator, buffer amplifier, constant current generator, amplifier, and peak detector [ 49 , 50 , 51 ]. We designed all electronic circuits of the taste sensing system to use readily available and inexpensive electronic components.…”

Section: Methodsmentioning

confidence: 99%

Highly Sensitive Multi-Channel IDC Sensor Array for Low Concentration Taste Detection

Khan

Kang

2015

Sensors

Self Cite

View full text Add to dashboard Cite

In this study, we designed and developed an interdigitated capacitor (IDC)-based taste sensor array to detect different taste substances. The designed taste sensing array has four IDC sensing elements. The four IDC taste sensing elements of the array are fabricated by incorporating four different types of lipids into the polymer, dioctyl phenylphosphonate (DOPP) and tetrahydrofuran (THF) to make the respective dielectric materials that are individually placed onto an interdigitated electrode (IDE) via spin coating. When the dielectric material of an IDC sensing element comes into contact with a taste substance, its dielectric properties change with the capacitance of the IDC sensing element; this, in turn, changes the voltage across the IDC, as well as the output voltage of each channel of the system. In order to assess the effectiveness of the sensing system, four taste substances, namely sourness (HCl), saltiness (NaCl), sweetness (glucose) and bitterness (quinine-HCl), were tested. The IDC taste sensor array had rapid response and recovery times of about 12.9 s and 13.39 s, respectively, with highly stable response properties. The response property of the proposed IDC taste sensor array was linear, and its correlation coefficient R2 was about 0.9958 over the dynamic range of the taste sensor array as the taste substance concentration was varied from 1 μM to 1 M. The proposed IDC taste sensor array has several other advantages, such as real-time monitoring capabilities, high sensitivity 45.78 mV/decade, good reproducibility with a standard deviation of about 0.029 and compactness, and the circuitry is based on readily available and inexpensive electronic components. The proposed IDC taste sensor array was compared with the potentiometric taste sensor with respect to sensitivity, dynamic range width, linearity and response time. We found that the proposed IDC sensor array has better performance. Finally, principal component analysis (PCA) was applied to discriminate different types of taste of the mixed taste substances.

show abstract

Section: Methodsmentioning

confidence: 99%

Highly Sensitive Multi-Channel IDC Sensor Array for Low Concentration Taste Detection

Khan

Kang

2015

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…The evanescent field’s energy may change owing to absorption or scattering of light into the overlay waveguide, or from changes in the refractive index of the overlay waveguide. Mathematically, the evanescent field can be represented by [43]

normalE (z) = E_{0} \exp (- \frac{z}{d_{P}}),

where

{normalE}_{0}

is the electric field amplitude of light at the interface of core–cladding and

normalz

is the distance of electric field in the cladding from the interface.

{normald}_{normalp}

is the penetration depth, and the sensitivity of the side-polished optical-fiber sensor depends on the penetration depth.…”

Section: Theory and Working Principle Of The Optical-fiber Pwm Ph-mentioning

confidence: 99%

Highly Sensitive and Wide-Dynamic-Range Multichannel Optical-Fiber pH Sensor Based on PWM Technique

Khan

Kang

2016

Sensors

Self Cite

View full text Add to dashboard Cite

In this study, we propose a highly sensitive multichannel pH sensor that is based on an optical-fiber pulse width modulation (PWM) technique. According to the optical-fiber PWM method, the received sensing signal’s pulse width changes when the optical-fiber pH sensing-element of the array comes into contact with pH buffer solutions. The proposed optical-fiber PWM pH-sensing system offers a linear sensing response over a wide range of pH values from 2 to 12, with a high pH-sensing ability. The sensitivity of the proposed pH sensor is 0.46 µs/pH, and the correlation coefficient R2 is approximately 0.997. Additional advantages of the proposed optical-fiber PWM pH sensor include a short/fast response-time of about 8 s, good reproducibility properties with a relative standard deviation (RSD) of about 0.019, easy fabrication, low cost, small size, reusability of the optical-fiber sensing-element, and the capability of remote sensing. Finally, the performance of the proposed PWM pH sensor was compared with that of potentiometric, optical-fiber modal interferometer, and optical-fiber Fabry–Perot interferometer pH sensors with respect to dynamic range width, linearity as well as response and recovery times. We observed that the proposed sensing systems have better sensing abilities than the above-mentioned pH sensors.

show abstract

“…In recent years, the surface plasmon resonance (SPR)-based optical sensing of several quantities such as chemicals [1,2], temperature [3], pressure [4], force [5], environmental monitoring [6], optofluidic detection [7], food safety [8], and biological species [9,10], as illustrated in Figure 1 [11][12][13][14], has been proven to be advantageous. The optical fiber deployed in such sensors has replaced the traditional substrates for SPR sensors such as prisms, electrodes, etc.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Plasmonic Sensor-Based Fiber Optic Probes for Biological Applications

et al. 2019

View full text Add to dashboard Cite

The survey focuses on the most significant contributions in the field of fiber optic plasmonic sensors (FOPS) in recent years. FOPSs are plasmonic sensor-based fiber optic probes that use an optical field to measure the biological agents. Owing to their high sensitivity, high resolution, and low cost, FOPS turn out to be potential alternatives to conventional biological fiber optic sensors. FOPS use optical transduction mechanisms to enhance sensitivity and resolution. The optical transduction mechanisms of FOPS with different geometrical structures and the photonic properties of the geometries are discussed in detail. The studies of optical properties with a combination of suitable materials for testing the biosamples allow for diagnosing diseases in the medical field.

show abstract

A High Sensitivity and Wide Dynamic Range Fiber-Optic Sensor for Low-Concentration VOC Gas Detection

Cited by 30 publications

References 40 publications

Highly Sensitive Multi-Channel IDC Sensor Array for Low Concentration Taste Detection

Highly Sensitive Multi-Channel IDC Sensor Array for Low Concentration Taste Detection

Highly Sensitive and Wide-Dynamic-Range Multichannel Optical-Fiber pH Sensor Based on PWM Technique

Recent Advances in Plasmonic Sensor-Based Fiber Optic Probes for Biological Applications

Contact Info

Product

Resources

About