scholarly journals iHEART: a miniaturized near-infrared in-line gas sensor using heart-shaped substrate-integrated hollow waveguides

The Analyst ◽  
2016 ◽  
Vol 141 (18) ◽  
pp. 5298-5303 ◽  
Author(s):  
Rafael L. Ribessi ◽  
Thiago de A. Neves ◽  
Jarbas J. R. Rohwedder ◽  
Celio Pasquini ◽  
Ivo M. Raimundo ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Near Infrared ◽  
Gas Sensing ◽  
Hollow Waveguide ◽  
Hollow Waveguides ◽  
Sensing System

Integration of a heart-shaped substrate-integrated hollow waveguide with a micro-spectrometer results in an ultra-compact gas sensing system: iHEART.

Development and Optimization of a Mid-Infrared Hollow Waveguide Gas Sensor Combined with a Supported Capillary Membrane Sampler

2003 ◽  
Vol 57 (6) ◽  
pp. 600-606 ◽  
Author(s):  
Fabiano De Melas ◽  
Viktor V. Pustogov ◽  
Nathan Croitoru ◽  
Boris Mizaikoff
Keyword(s):  
Gas Sensor ◽  
Industrial Applications ◽  
Hollow Waveguide ◽  
Mid Infrared ◽  
Hollow Waveguides ◽  
Sensing System ◽  
Capillary Membrane ◽  
Sensor Module ◽  
Optical Configuration ◽  
Ft Ir

A gas sensor for application in water analysis was developed by combination of a mid-infrared (MIR) hollow waveguide with a Fourier transform infrared (FT-IR) spectrometer and coupling of the hollow waveguide gas sensor module to a supported capillary membrane sampler (SCMS) for continuous liquid-gas extraction. Different hollow waveguides have been characterized in this study for developing an optimized optical configuration. Analysis of industrially relevant compounds has been performed, investigating chlorinated hydrocarbons (CHCs), such as dichloromethane and chloroform, representing highly volatile analytes, and 1,4-dioxane as an example of target compounds with low volatility. The suitability of this spectroscopic IR sensing system for industrial applications is demonstrated under simulated real-world conditions with limits of detection in the ppb (v/v) and ppm (v/v) concentration range for CHCs and 1,4-dioxane, respectively.

Research on Miniaturization of Hollow Waveguide for Spectrum Absorptive Gas Sensing System

2016 ◽  
Vol 36 (9) ◽  
pp. 0923001
Author(s):  
卫雨青 Wei Yuqing ◽  
魏静怡 Wei Jingyi ◽  
朱晓松 Zhu Xiaosong ◽  
石艺尉 Shi Yiwei
Keyword(s):  
Gas Sensing ◽  
Hollow Waveguide ◽  
Sensing System

Infrared Hollow Waveguides for Capillary Flow Cells

1993 ◽  
Vol 47 (10) ◽  
pp. 1665-1669 ◽  
Author(s):  
S. Sato ◽  
M. Saito ◽  
M. Miyagi
Keyword(s):  
Response Time ◽  
Cell Volume ◽  
Spectral Region ◽  
Capillary Flow ◽  
Gas Sensing ◽  
Flow Cell ◽  
Hollow Waveguide ◽  
Flow Cells ◽  
Hollow Waveguides ◽  
Infrared Spectral

Infrared hollow waveguides were studied for use as a capillary flow cell in spectroscopic gas sensing. Explosive gases (CH4, C4H10) were detected successfully by using a ZnS-coated Ag hollow waveguide, which has a high transmittance over a wide infrared spectral region. The response time was reduced to 0.1 s owing to the decrease in the cell volume. Pollution gases (SO2, NO2) were measured by a glass hollow waveguide, which is durable for such corrosive gases. By using these hollow waveguides, we can extend the optical pathlength easily, and consequently we can expect enhancement of the sensitivity.

iHWG-μNIR: a miniaturised near-infrared gas sensor based on substrate-integrated hollow waveguides coupled to a micro-NIR-spectrophotometer

The Analyst ◽  
2014 ◽  
Vol 139 (14) ◽  
pp. 3572 ◽  
Author(s):  
J. J. R. Rohwedder ◽  
C. Pasquini ◽  
P. R. Fortes ◽  
I. M. Raimundo ◽  
A. Wilk ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Near Infrared ◽  
Hollow Waveguides

scholarly journals Characterization of Gas Absorption Modules Based on Flexible Mid-Infrared Hollow Waveguides

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1698
Author(s):  
Kewang Chen ◽  
Zeqiao Zhao ◽  
Xuewen Zhang ◽  
Xian Zhang ◽  
Xiaosong Zhu ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Coupling Efficiency ◽  
Gas Absorption ◽  
Infrared Light ◽  
Experimental Investigations ◽  
Hollow Waveguide ◽  
Low Loss ◽  
Mid Infrared ◽  
Hollow Waveguides ◽  
Sensing System

A new gas absorption module, the substrate-embedded hollow waveguide (eHWG) model, is proposed. It consists of a substrate with a curved channel and a hollow waveguide. The hollow waveguide is curved into the channel and works as a gas absorption cell as well as a transmission medium for mid-infrared light. Owing to the low loss property of the hollow waveguide, the signal-to-noise ratio (SNR) was improved for the sensing system. A polycarbonate (PC) base tube was used to obtain flexibility in the fabrication of the hollow waveguide. A silver (Ag) layer and a silver iodide (AgI) layer were inner-coated to ensure a low loss property at the fingerprint wavelength of methane gas. A sensing system was established using a Fourier transform infrared spectrometer (FTIR), an external detector, and an eHWG. Experimental investigations were carried on the sensing performance of eHWGs with various channel shapes. Comparison studies were made on eHWGs embedded with Ag-coated or Ag- and AgI-coated hollow waveguides. The Ag- and AgI-coated hollow waveguides with inner diameters of 0.7, 1.4, and 2.0 mm were used in the eHWGs. The large bore waveguide had low loss but high bending additional loss. The large bore waveguide had a low detection limit due to high coupling efficiency with the light source. A limit of detection (LOD) as low as 2.7 ppm was attained for the system using the eHWG with the long and large bore waveguide.

Metal-oxide based ammonia gas sensors: A review

2020 ◽  
Vol 10 ◽  
Author(s):  
Priya Gupta ◽  
Savita Maurya ◽  
Narendra Kumar Pandey ◽  
Vernica Verma
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Review Paper ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Ammonia Gas Sensors

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

Erratum: Remote gas sensing with mid-infra-red hollow waveguide

1992 ◽  
Vol 28 (9) ◽  
pp. 895
Author(s):  
C.A. Worrell ◽  
I.P. Giles ◽  
N.A. Adatia
Keyword(s):  
Gas Sensing ◽  
Hollow Waveguide ◽  
Infra Red
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