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Volume 18, Issue 1 (10-2024)
IJOP 2024, 18(1): 43-50 |
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Jaleh B, Asgary A. Precise Water Isotope Analysis in the Natural Concentration Range Using Off-Axis Integrated Cavity Output Spectroscopy (OA-ICOS). IJOP 2024; 18 (1) :43-50
URL: http://ijop.ir/article-1-575-en.html
URL: http://ijop.ir/article-1-575-en.html
1- Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
2- Bu Ali Sina university & aFaculty of Science, Bu-Ali Sina University, Hamedan, Iran
2- Bu Ali Sina university & aFaculty of Science, Bu-Ali Sina University, Hamedan, Iran
Abstract: (130 Views)
A compact sensor utilizing off-axis integrated cavity output spectroscopy at a wavelength of 1.389 μm was developed to measure the δ¹⁸O and δ²H isotopic ratios in liquid water samples within the natural concentration range. Allan variance analysis indicated an optimal averaging time of approximately 21 s. The stability and long-term reproducibility of the laser system were assessed using 1-second averaging over 75 min. The minimum detectable absorption (MDA) was determined to be approximately 8.4 × 10⁻⁴ Hz⁻¹/² with a 17 s averaging time. To assess accuracy and reproducibility, the setup was tested within the natural concentration range (δ²H: -400 to 0‰ and δ¹⁸O: -54 to 0‰) using five standard samples, achieving an average accuracy and reproducibility of better than 2.5‰ for δ²H and 0.5‰ for δ¹⁸O.
Keywords: Water Isotopes, Natural concentration, Laser Spectroscopy, Allan deviation, Sensitivity, Accuracy, Averaging.
Type of Study: Research |
Subject:
Spectroscopy
Received: 2024/12/18 | Revised: 2025/07/15 | Accepted: 2025/07/13 | Published: 2025/07/15
Received: 2024/12/18 | Revised: 2025/07/15 | Accepted: 2025/07/13 | Published: 2025/07/15
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