Optical design of double-grating and double wave band spectrometers using a common CCD

Xue, Qi‐Kun; Lu, Fengqin; Duan, Minzheng; Zheng, Yufang; Wang, Xiaoheng; Cao, Dengqing; Lin, Guangyu; Tian, Jiewen

doi:10.1364/ao.57.006823

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…Table 2 shows the design parameters of the modified optical structure. The astigmatism of the optical system can be evaluated by the size of the root mean square (RMS) spot radius x (using ZEMAX software, Version, Kirkland, WA, USA) [28]. We compared the modified crossed Czerny-Turner optical design to our previous optical structure to evaluate the broadband astigmatism correction [11], as shown in Figure 3.…”

Section: Optical Designmentioning

confidence: 99%

Miniature Broadband NIR Spectrometer Based on FR4 Electromagnetic Scanning Micro-Grating

et al. 2020

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This paper presents a miniaturized, broadband near-infrared (NIR) spectrometer with a flame-retardant 4 (FR4)-based scanning micrograte. A 90° off-axis parabolic mirror and a crossed Czerny–Turner structure were used for creating an astigmatism-free optical system design. The optical system of the spectrometer consists of a 90° off-axis parabolic mirror, an FR4-based scanning micrograte, and a two-color indium gallium arsenide (InGaAs) diode with a crossed Czerny–Turner structure optical design. We used a wide exit slit and an off-axis parabolic mirror with a short focal length to improve the signal-to-noise ratio (SNR) of the full spectrum. We enabled a miniaturized design for the spectrometer by utilizing a novel FR4 micrograte for spectral dispersion and spatial scanning. The spectrometer can detect the full near-infrared spectrum while only using a two-color InGaAs diode, and thus, the grating scanning angle of this spectrometer is small when compared to a dual-detector-based spectrometer. In addition, the angle signal can be obtained through an angle sensor, which is integrated into the scanning micrograte. The real-time angle signal is used to form a closed-loop control over the scanning micrograte and calibrate the spectral signal. Finally, a series of tests was performed. The experimental results showed that the spectrometer has a working wavelength range of 800–2500 nm. The resolution is 10 nm at a wavelength range of 800–1650 nm and 15 nm at a wavelength range of 1650–2500 nm. Similarly, the stability of these two wavelength ranges is better than ±1 nm and ±2 nm, respectively. The spectrometer’s volume is 80 × 75 × 65 mm3 and its weight is 0.5 kg. The maximum spectral fluctuation does not exceed 1.5% and the signal-to-noise ratio is 284 after only one instance of averaging.

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Section: Optical Designmentioning

confidence: 99%

Miniature Broadband NIR Spectrometer Based on FR4 Electromagnetic Scanning Micro-Grating

et al. 2020

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“…In order to achieve high-resolution and wide waveband detection, long focal lengths and multiple linear detectors are usually used, resulting in a larger volume of the direct-reading spectrometer, which is inconvenient for on-site detection. However, it is difficult to achieve a wide-working waveband, high resolution, and high speed simultaneously in a small-volume spectrometer [7,8]. A possible solution to reduce the volume is using an adjustable mechanical structure; however, it is hard to quickly collect multiple sets of spectral data during spectrum acquisition, and it is difficult to control the accuracy during the adjustment process and the stability during long-term use [9,10].…”

Section: Introductionmentioning

confidence: 99%

Optical Design of an Integrated Paschen–Runge Spectrometer by Using a Multigrating Structure

et al. 2022

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An integrated direct-reading spectrometer scheme using seven concave gratings is proposed. At present, the optical design simulation has been completed, and the subsequent physical design may be carried out according to the simulation results. Ray-tracing software (Zemax) is used to divide the spectrum on the grating into seven bands, and an area array detector is used to receive the spectral signals simultaneously, which reduces the volume of the spectrometer and improves the spectral consistency. Using this method, a spectrometer covering 230–440 nm is designed, and the spectral resolution of the center wavelength corresponding to the seven grating windows of 230–260 nm, 260–290 nm, 290–320 nm, 320–350 nm, 350–380 nm, 380–410 nm, and 410–440 nm can reach 0.0974 nm, 0.0652 nm, 0.0361 nm, 0.0157 nm, 0.0838 nm, 0.0872 nm, and 0.1471 nm.

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“…By changing a single grating to multi-grating, interference images with high spectral resolution and large spectral range were successfully obtained [14]. In 2018, Xue researched a dual-grating dual-band imaging spectrometer, which divided the field of view into two and imaged different bands respectively [15].…”

Section: Introductionmentioning

confidence: 99%

Dual-Gratings Imaging Spectrometer

et al. 2021

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Common dispersive-type spectroscopic instruments include prism-type and grating-type, usually using a single dispersive element. The continuous imaging band is always limited by the dispersion angle. When it is necessary to image two wavebands with an ultra-spectral resolution that are far apart, the imaging is difficult due to the large diffraction angle. To broaden the spectral coverage of the imaging spectrometer, in this paper, we propose a dual-gratings imaging spectrometer with two independently rotating gratings. In this proposed system, two very far apart wavelength bands can be imaged in the adjacent areas by adjusting the angle of the dual gratings. This greatly expands the spectral coverage of the imaging spectrometer. Currently, the only application area considered for this instrument is solar applications. In this article, we present the optical system of the dual-gratings imaging spectrometer, illustrate several advantages of the new structure, and discuss new problems caused by the dual-gratings, which are referred to as overlap between two spectra and double image offset. We deduced the calculation process of the dual grating rotation angle, the relationship between the final acquired image and the slit, the relationship between the angle change between the dual gratings and the double image offset, and the relationship between the MTF upper limit reduction and the spatial frequency. This article also summarizes the shortcomings of this structure and studies the applicable fields under these shortcomings. At last, we simulate a dual-gratings imaging spectrometer system, compare this scheme with two traditional schemes, and conclude that this instrument has certain practical significance.

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Optical design of double-grating and double wave band spectrometers using a common CCD

Cited by 10 publications

References 9 publications

Miniature Broadband NIR Spectrometer Based on FR4 Electromagnetic Scanning Micro-Grating

Miniature Broadband NIR Spectrometer Based on FR4 Electromagnetic Scanning Micro-Grating

Optical Design of an Integrated Paschen–Runge Spectrometer by Using a Multigrating Structure

Dual-Gratings Imaging Spectrometer

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