Three-channel filter-based non-imaging passive ranging system based on oxygen absorption

Yu, Hao; Liu, Bingqi; Zhang, Yu; Yan, Zongqun; Chen, Yichao; Zhang, Shuai; Huang, Fuyu; Shen, Xueju

doi:10.1016/j.optlastec.2018.09.018

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…More specifically, MPR as first proposed by M. R. Hawks 1 observes the optical spectrum of an emissive target around the 762 nm absorption band of O2 as well as the non-absorbing 750 nm and 780 nm bands in order to calculate the total transmissivity of this particle species, from which a range estimate can be obtained. This method has been used to estimate distance for rockets, fighter jets, and reference lamp sources [2][3][4][5][6] , yielding errors below 7% and 3% for long and short distance experiments, respectively. However, most of these experiments have been performed either with a Fourier transform spectrometer or by switching between three bandpass filters in series, significantly impacting the feasibility of the systems.…”

Section: Introductionmentioning

confidence: 99%

Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer

Gamboa¹,

Hamidfar²,

Shen³

et al. 2023

Practical Holography XXXVII: Displays, Materials, and Applications

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Distance estimation is an important yet challenging part of any tracking system, as being able to quickly locate an object in 3D space allows for the automated targeting of communication, delivery, and interception systems, as well as providing important telemetry about fast moving objects. A monocular passive ranging system is defined as that which only requires one observation point through which it measures some outside signal to estimate range. The approach presented here simultaneously observes the intensity of light emitted by the target at three wavelength bands with ~10nm FWHM, centered at 750, 762, and 780 nm. The light is separated using a PQ:PMMA holographic optical element (HOE) configured as a wavelength division demultiplexer. Light at the two outer bands experiences negligible absorption in the atmosphere, while light at ~762 nm is strongly absorbed by O2. By comparing the intensity of the two unabsorbed bands, we may interpolate the expected intensity of the 762 nm band if there is no O2 in the path. This is then used in conjunction with the 762 nm band measurement to approximate the total O2 transmissivity. Finally, Beer’s law and the HITRAN database provide us with the tools to convert a transmissivity into a distance estimation. The use of an HOE is pivotal in the practicality of such a system, as it allows us to measure all three signals simultaneously, thus eliminating the effects of turbulence and reducing overall noise.

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Section: Introductionmentioning

confidence: 99%

Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer

Gamboa¹,

Hamidfar²,

Shen³

et al. 2023

Practical Holography XXXVII: Displays, Materials, and Applications

View full text Add to dashboard Cite

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Active 3D camera based on laser absorption of molecular oxygen

Kääriäinen,

Seppä

2023

Optica Imaging Congress (3D, COSI, DH, FLatOptics, IS, pcAOP)

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3D camera based on laser light absorption by atmospheric oxygen at 761 nm

Kääriäinen,

Seppä

2024

Opt. Express

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A 3D camera based on laser light absorption of atmospheric oxygen at 761 nm is presented. The camera uses a current-tunable single frequency distributed feedback laser for active illumination and a silicon-based image sensor as a receiver. This simple combination enables capturing 3D images with a compact and mass producible set-up. The 3D camera is validated in indoor environments. Distance accuracy of better than 4 cm is demonstrated between 4 m and 10 m distances. Future potential and improvements are discussed.

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Three-channel filter-based non-imaging passive ranging system based on oxygen absorption

Cited by 3 publications

References 13 publications

Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer

Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer

Active 3D camera based on laser absorption of molecular oxygen

3D camera based on laser light absorption by atmospheric oxygen at 761 nm

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