Next Article in Journal
Fully Integrated Low-Noise Readout Circuit with Automatic Offset Cancellation Loop for Capacitive Microsensors
Next Article in Special Issue
Determination of the Mineral Composition and Toxic Element Contents of Propolis by Near Infrared Spectroscopy
Previous Article in Journal
Data Fusion for Driver Behaviour Analysis
Previous Article in Special Issue
A Wireless Multi-Sensor Dielectric Impedance Spectroscopy Platform
Article Menu

Export Article

Open AccessArticle
Sensors 2015, 15(10), 25992-26008; doi:10.3390/s151025992

Nitric Oxide Isotopic Analyzer Based on a Compact Dual-Modulation Faraday Rotation Spectrometer

1
Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
2
Department of Geosciences, Princeton University, Princeton, NJ 08544, USA
3
Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
4
Now with Healthy Photon, 200 East Guoding Road, Shanghai, China
*
Author to whom correspondence should be addressed.
Academic Editors: Mark A. Arnold and Hoeil Chung
Received: 31 July 2015 / Revised: 28 September 2015 / Accepted: 8 October 2015 / Published: 14 October 2015
(This article belongs to the Special Issue Chemical Sensors based on In Situ Spectroscopy)
View Full-Text   |   Download PDF [1583 KB, uploaded 14 October 2015]   |  

Abstract

We have developed a transportable spectroscopic nitrogen isotopic analyzer. The spectrometer is based on dual-modulation Faraday rotation spectroscopy of nitric oxide isotopologues with near shot-noise limited performance and baseline-free operation. Noise analysis indicates minor isotope (15NO) detection sensitivity of 0.36 ppbv·Hz−1/2, corresponding to noise-equivalent Faraday rotation angle (NEA) of 1.31 × 10−8 rad·Hz−1/2 and noise-equivalent absorbance (αL)min of 6.27 × 10−8 Hz−1/2. White-noise limited performance at 2.8× the shot-noise limit is observed up to ~1000 s, allowing reliable calibration and sample measurement within the drift-free interval of the spectrometer. Integration with wet-chemistry based on acidic vanadium(III) enables conversion of aqueous nitrate/nitrite samples to gaseous NO for total nitrogen isotope analysis. Isotopic ratiometry is accomplished via time-multiplexed measurements of two NO isotope transitions. For 5 μmol potassium nitrate samples, the instrument consistently yields ratiometric precision below 0.3‰, thus demonstrating potential as an in situ diagnostic tool for environmental nitrogen cycle studies. View Full-Text
Keywords: Faraday effect; optical sensing and sensors; spectroscopy; nitrogen cycle; nitric oxide; isotopic ratiometry Faraday effect; optical sensing and sensors; spectroscopy; nitrogen cycle; nitric oxide; isotopic ratiometry
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Zhang, E.; Huang, S.; Ji, Q.; Silvernagel, M.; Wang, Y.; Ward, B.; Sigman, D.; Wysocki, G. Nitric Oxide Isotopic Analyzer Based on a Compact Dual-Modulation Faraday Rotation Spectrometer. Sensors 2015, 15, 25992-26008.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top