Absolute detector-based spectrally tunable radiant source using digital micromirror device and supercontinuum fiber laser

Abstract

High-accuracy absolute detector-based spectroradiometric calibration techniques traceable to cryogenic absolute radiometers have made progress rapidly in recent decades under the impetus of atmospheric quantitative spectral remote sensing. A high brightness spectrally tunable radiant source using a supercontinuum fiber laser and a digital micromirror device (DMD) has been developed to meet demands of spectroradiometric calibrations for ground-based, aeronautics-based, and aerospace-based remote sensing instruments and spectral simulations of natural scenes such as the sun and atmosphere. Using a supercontinuum fiber laser as a radiant source, the spectral radiance of the spectrally tunable radiant source is 20 times higher than the spectrally tunable radiant source using conventional radiant sources such as tungsten halogen lamps, xenon lamps, or LED lamps, and the stability is better than ±0.3%/h. Using a DMD, the spectrally tunable radiant source possesses two working modes. In narrow-band modes, it is calibrated by an absolute detector, and in broad-band modes, it can calibrate for remote sensing instrument. The uncertainty of the spectral radiance of the spectrally tunable radiant source is estimated at less than 1.87% at 350 nm to 0.85% at 750 nm, and compared to only standard lamp-based calibration, a greater improvement is gained.

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

“…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.…”

“…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).…”

A 380-1100nm spectrum matching light source with high spectral resolution, throughput, speed, and stability

“…It offers a full wavelength range (380nm to 1100nm) of spectral matching with high spectral power. The source can be a valuable tool for ambient sensor or image sensor calibration [8,15,23,24], display calibration, hyperspectral imaging, spectroscopy [3,4,16,24], healthcare [12,14], radiometry [2,18,19,21], diagnostics and biomedical-related applications [7,9,12,20,22], which also need to consider the ambient light or NIR light effects and simulate the detailed spectral profiles of arbitrary light sources with more extended wavelength range and high fidelity.…”

The characterization and matching algorithm of LDLS-based broadband spectrum matching light source

“…In addition, the spectral width of single wavelength LED is usually too wide to emulate a spectrum with sharp spikes like fluorescent light. When a broadband light source is dispersed by a grating and focused onto a digital micromirror device (DMD) [7][8][9], the spectral tuning can be realized by programmably changing the mirror on/off patterns. There is a near continuous selection of wavelengths within the system's spectral coverage and the spectral width can be designed much narrower than that of LED based systems.…”