An indoor calibration light source of the transmissometers based on spatial light modulation

Jing, Liang; Zhang, Guoyu; Zhang, Jian; Xu, Ding; Chong, Wei; Sun, Jiliang

doi:10.1007/s11801-022-1112-z

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…We are exploring an optical design without slits to improve the optical throughput, and this problem is expected to be resolved in future work. Our SES also has other potential applications, such as in star simulators [ 22 ], calibration light sources [ 24 , 25 , 26 ], and other scenes requiring tunable spectra. The SES can even be used as a simulation and verification platform for various forms of spectral encoding schemes and spectral reconstruction verification.…”

Section: Discussionmentioning

confidence: 99%

“…The projection principle was the same as that of DLP projectors, and the proposed projector achieved spectral image projection similar to the HIP [ 21 ]. In addition to the abovementioned techniques, spectral light engines have been developed in various fields, such as stellar simulation [ 22 ], lasers [ 23 ], and spectral calibration [ 24 , 25 , 26 ]. In addition, there are some commercially available spectral light engines, such as Optronic Laboratories OL490 and the recently developed Chromatiq Spectral Engine (CSE) from Energetic (Hamamatsu).…”

Section: Introductionmentioning

confidence: 99%

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A Spectral Encoding Simulator for Broadband Active Illumination and Reconstruction-Based Spectral Measurement

Jiang

Wang

Zhang

et al. 2023

Sensors

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Spectral reflectance or transmittance measurements provide intrinsic information on the material of an object and are widely used in remote sensing, agriculture, diagnostic medicine, etc. Most reconstruction-based spectral reflectance or transmittance measurement methods based on broadband active illumination use narrow-band LEDs or lamps combined with specific filters as spectral encoding light sources. These light sources cannot achieve the designed spectral encoding with a high resolution and accuracy due to their low degree of freedom for adjustment, leading to inaccurate spectral measurements. To address this issue, we designed a spectral encoding simulator for active illumination. The simulator is composed of a prismatic spectral imaging system and a digital micromirror device. The spectral wavelengths and intensity are adjusted by switching the micromirrors. We used it to simulate spectral encodings according to the spectral distribution on micromirrors and solved the DMD patterns corresponding to the spectral encodings with a convex optimization algorithm. To verify the applicability of the simulator for spectral measurements based on active illumination, we used it to numerically simulate existing spectral encodings. We also numerically simulated a high-resolution Gaussian random measurement encoding for compressed sensing and measured the spectral reflectance of one vegetation type and two minerals through numerical simulations. We reconstructed the spectral transmittance of a calibrated filter through an experiment. The results show that the simulator can measure the spectral reflectance or transmittance with a high resolution and accuracy.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Spectral Encoding Simulator for Broadband Active Illumination and Reconstruction-Based Spectral Measurement

Jiang

Wang

Zhang

et al. 2023

Sensors

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Research on the simulation method of a BP neural network PID control for stellar spectrum

Yun,

Zhang,

Liu

et al. 2024

Opt. Express

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This study investigated the multiple correlations among spectral simulation units based on digital micromirror device (DMD) spectral simulation, which leads to the problem that conventional spectral simulation methods such as PID control exhibit a low fitting accuracy or long fitting time in the spectral simulation of various targets. In this paper, a method of stellar spectrum simulation based on back propagation neural network-based PID (BP-PID) control is proposed to achieve high efficiency and high precision simulation of various spectral targets. The topology of the BP neural network was constructed based on the spectral modulation model of a DMD stellar spectrum simulation system, and the algorithm of the BP-PID control was designed. Finally, an experimental platform was built to verify the performance and spectral simulation accuracy of the BP-PID control algorithm. The results show that the overshoot and response time of the BP-PID control algorithm decreased by 79.01% and 30%, respectively compared with those of the PID control algorithm. The maximum spectral simulation accuracies of 2000K, 7000K, and 12000K color temperature increased by a factor of 2.311, 1.871, and 2.254, respectively, and the standard deviations of the spectral simulation error decreased by 56%, 41%, and 54%, respectively. In the range of 2000-12000K color temperature, the spectral simulation error of the BP-PID control algorithm is better than ±3.495%, and the standard deviation of the spectral simulation error is between 1.8255 and 2.2358. The proposed method can improve the spectral simulation accuracy and simulation efficiency of a star simulator, reduce the magnitude and spectrum calibration errors caused by the differential response, improve the star feature recognition accuracy of the orbiting star sensor, and hence, provide a theoretical and technical basis for the development of high-precision star sensors.

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Fast and low energy-consumption integrated Fourier-transform spectrometer based on thin-film lithium niobate

Wang,

Ruan,

Chen

et al. 2024

Nanophotonics

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Integrated miniature spectrometers have impacts in industry, agriculture, and aerospace applications due to their unique advantages in portability and energy consumption. Although existing on-chip spectrometers have achieved breakthroughs in key performance metrics, such as, a high resolution and a large bandwidth, their scanning speed and energy consumption still hinder practical applications of such devices. Here, a stationary Fourier transform spectrometer is introduced based on a Mach–Zehnder interferometer structure on thin-film lithium niobate. Long and low-loss spiral waveguides with electro-optic tuning are adopted as the optical path scanning elements with a half-wave voltage of 0.14 V. A high resolution of 2.1 nm and a spectral recovery with a bandwidth of 100 nm is demonstrated under a high-speed and high-voltage scanning in the range of −100 V to +100 V at up to 100 KHz. A low energy consumption in the μJ scale per scan is also achieved.

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An indoor calibration light source of the transmissometers based on spatial light modulation

Cited by 3 publications

References 7 publications

A Spectral Encoding Simulator for Broadband Active Illumination and Reconstruction-Based Spectral Measurement

A Spectral Encoding Simulator for Broadband Active Illumination and Reconstruction-Based Spectral Measurement

Research on the simulation method of a BP neural network PID control for stellar spectrum

Fast and low energy-consumption integrated Fourier-transform spectrometer based on thin-film lithium niobate

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