AI Article Synopsis
- Frequency-modulation spectroscopy (FMS) is effective for code-division multiplexing and can enhance continuous-wave LIDAR using a specific CO absorption transition at 1.6 µm.
- This method benefits from coherent detection and effectively reduces interference from broad absorption backgrounds.
- Future applications could involve detecting multiple transitions simultaneously by using encoded frequency-modulated signals, allowing for improved target distance detection and analysis of absorption signals.
Article Abstract
Frequency-modulation spectroscopy (FMS) is generally suited to code-division multiplexing, and we demonstrate that capacity in a form of continuous-wave LIDAR, utilizing a sharp CO absorption transition at 1.6 µm in simple ranging setups. The approach retains the advantages of FMS, including coherent detection and good rejection of broad absorption backgrounds. Extensions of this multiplexed approach to the continuous, simultaneous detection of several transitions would come by transmitting an encoded combination of frequency-modulated carriers, each tuned to detect a unique absorption transition. Signal analysis at the receiver involves a simple process of de-multiplexing that, in a general application, reveals targets at various distances and the absorption-related FMS signals in between.
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| http://dx.doi.org/10.1364/OE.427710 | DOI Listing |
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