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Article

Generalized Optical Design of the Double-Row Circular Multi-Pass Cell

State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
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Author to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 9 August 2018 / Accepted: 13 August 2018 / Published: 15 August 2018
(This article belongs to the Collection Gas Sensors)
A new design of circular multi-pass cells (CMPC) with two rows of reflection spots on mirrors is presented. The effective optical path length (OPL) of this novel CMPC is double that of traditional CMPC with the same diameter and interval of spots. This OPL can be readily adjusted to have regular intervals by rough rotation adjustment. We achieved a spatial separation of pre- and post-transfer optical systems that was adequately large even in the cases with a large number of passes. Analytical chief ray tracing analysis and a generalized method for parameter determination for designing the cell are presented in detail. The stable condition of the double-row CMPC (DR-CMPC) is also derived by the ABCD matrix method. Designs with maximum effective OPL of 74.72 m, 48.67 m and 24.57 m are demonstrated and verified by ray tracing simulations within a 25 cm diameter DR-CMPC. An adjustment of the regular intervals to 1 m can be achieved in both designs. The overall astigmatism of the design with an effective OPL of 74.72 m is only 9.30 × 10−6 mm, which is four orders of magnitude smaller than that of the traditional CMPC with similar geometric parameters. View Full-Text
Keywords: gas sensing; absorption spectroscopy; multi-pass cell; geometric optical design gas sensing; absorption spectroscopy; multi-pass cell; geometric optical design
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MDPI and ACS Style

Yang, Z.; Guo, Y.; Ming, X.; Sun, L. Generalized Optical Design of the Double-Row Circular Multi-Pass Cell. Sensors 2018, 18, 2680. https://0-doi-org.brum.beds.ac.uk/10.3390/s18082680

AMA Style

Yang Z, Guo Y, Ming X, Sun L. Generalized Optical Design of the Double-Row Circular Multi-Pass Cell. Sensors. 2018; 18(8):2680. https://0-doi-org.brum.beds.ac.uk/10.3390/s18082680

Chicago/Turabian Style

Yang, Zheng, Yin Guo, Xianshun Ming, and Liqun Sun. 2018. "Generalized Optical Design of the Double-Row Circular Multi-Pass Cell" Sensors 18, no. 8: 2680. https://0-doi-org.brum.beds.ac.uk/10.3390/s18082680

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