DMD diffraction measurements to support design of projectors for test and evaluation of multispectral and hyperspectral imaging sensors

Rice, Joseph P.; Neira, Jorge; Kehoe, Michael; Swanson, Rand

doi:10.1117/12.808990

Cited by 39 publications

(23 citation statements)

References 10 publications

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“…The angle of incidence of the collimated beam on the DMD has to be the "blaze" angle, so that diffraction from the micromirror array is minimised [29]. The blaze angle is wavelength dependent and within a very small range, so careful alignment is necessary to achieve it.…”

Section: B Measurement System Layoutmentioning

confidence: 99%

Compressed Sensing Current Mapping Spatial Characterization of Photovoltaic Devices

Koutsourakis

Cashmore

Hall

et al. 2017

IEEE J. Photovoltaics

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Section: B Measurement System Layoutmentioning

confidence: 99%

Compressed Sensing Current Mapping Spatial Characterization of Photovoltaic Devices

Koutsourakis

Cashmore

Hall

et al. 2017

IEEE J. Photovoltaics

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“…The slight angular disparity of the text with respect to the stage movement axes is believed to be a slight misalignment of the vertical axis of the DMD surface. On the assumption that 1000 structures with width of 30µm can be fabricated in 1 second (based on the 1kHz laser repetition rate), a coverage of 1mm 2 could, in theory, be fabricated within a timescale of order seconds. However, in practice, it is likely that the stage movement would not be accurate enough when operating at this required speed.…”

Section: Contiguous Structuresmentioning

confidence: 99%

“…For micron-scale fabrication, laser machining via DMDs is proposed as an alternative approach to existing focused-ion-beam and electron-beam lithography-based techniques which, although offering significantly higher resolutions, are both based on serial processing, and hence are intrinsically much slower fabrication tools. Due to their low-cost and high switching speeds, DMDs are rapidly becoming an attractive approach for applications in the photonics and medical sciences [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Single-pulse multiphoton polymerization of complex structures using a digital multimirror device

Mills¹,

Grant-Jacob²,

Feinaeugle³

et al. 2013

Opt. Express

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“…OPO sources aand quantum cascade laser sources do not have the spectral coverage. To meet testing requirements for IR sensor systems, we have developed a broadband fiber based supercontinuum mid-IR source for projection systems..The National Institute of Standards and Technology (NIST), Gaithersburg, MD, is developing a Hyperspectral Image Projector (HIP) for the testing, calibration, and system-level validation of multispectral and hyperspectral imaging sensors [1,2]. The system is capable of projecting scenes with specific spectral content at video frame rates.…”

mentioning

confidence: 99%

“…The National Institute of Standards and Technology (NIST), Gaithersburg, MD, is developing a Hyperspectral Image Projector (HIP) for the testing, calibration, and system-level validation of multispectral and hyperspectral imaging sensors [1,2]. The system is capable of projecting scenes with specific spectral content at video frame rates.…”

mentioning

confidence: 99%

Broadband mid-IR fiber supercontinuum source for hyperspectral image projection

Shaw¹,

Gattass²,

Sanghera³

et al. 2011

2011 IEEE Photonics Society Summer Topical Meeting Series

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Testing, calibration, and validation of imaging sensors and imaging systems require bright sources of emission to simulate scene artifacts. Ideally, such sources are broadband or tunable over a wide wavelength region to provide spectral content to the scenes and/or to target the spectral response of the system. In the mid-infrared (IR), projection systems for sensor testing typically use globars, blackbodies, resistor arrays, optical parametric oscillators (OPO), or quantum cascade laser sources. Globars and resistor arrays are not bright enough to simulate high temperature artifacts which may be necessary for testing of some sensors and systems. OPO sources aand quantum cascade laser sources do not have the spectral coverage. To meet testing requirements for IR sensor systems, we have developed a broadband fiber based supercontinuum mid-IR source for projection systems..The National Institute of Standards and Technology (NIST), Gaithersburg, MD, is developing a Hyperspectral Image Projector (HIP) for the testing, calibration, and system-level validation of multispectral and hyperspectral imaging sensors [1,2]. The system is capable of projecting scenes with specific spectral content at video frame rates. A schematic of the HIP system is shown in Fig. 1 below. The system is based upon two modified-commercial digital micromirror devices (DMDs) which are used in series to project the spectral content (DMD1) and the spatial content (DMD2) of the scene. For the HIP system, Naval Research Lab is developing an IR fiber supercontinuum source [3]. Requirements for illumination of the HIP system are spectral power density of -20 dBm/nm or higher, spectral flatness of 10 dB within the band of interest (3 µm to 5 µm), and continuous wave (CW) or high repetition rate pulse trains. The repetition rate must be ~1 MHz or greater so that it far exceeds the temporal response of the system under test. The output diameter of the fiber can be no greater than 20 µm in diameter to maintain the spectral resolution of the system.The supercontinuum source is composed of a 2 meter length of single-mode 10 µm core /140 µm clad As 2 S 3 fiber pumped with an amplified and Raman shifted 500 kHz, 80 ps Er mode-locked fiber laser. As the pump and generated supercontinuum fall within the normal dispersion regime of the fiber, the mechanism of supercontinuum is primarily cascaded Raman and self phase modulation. The use of a broadband pump with several cascaded 93TuB3.3 (Contributed Oral) 14:30 -14:45 U.S. Government work not protected by U.S. copyrightRaman shifts convoluted with the Raman gain bandwidth of the fiber and spectral broadening due to self phase modulation results in a broadband flat continuous spectrum from 1.5 µm to 5 µm as shown in Fig. 2. Currently, spectral flatness is 10 dB from 1.9 to 4.4 µm and 20 dB from 1.64 to 4.78 µm. Figure 2.Mid-IR supercontinuum from 2 meter length As 2 S 3 fiber. The black temperature lines indicate equivalent blackbody temperature of a projected scene from the HIP system using the source.In the HIP...

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DMD diffraction measurements to support design of projectors for test and evaluation of multispectral and hyperspectral imaging sensors

Cited by 39 publications

References 10 publications

Compressed Sensing Current Mapping Spatial Characterization of Photovoltaic Devices

Compressed Sensing Current Mapping Spatial Characterization of Photovoltaic Devices

Single-pulse multiphoton polymerization of complex structures using a digital multimirror device

Broadband mid-IR fiber supercontinuum source for hyperspectral image projection

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