Optical design and evaluation of an advanced scanning Dyson imaging spectrometer for ocean color

Abstract

An advanced Dyson imaging spectrometer in the near ultraviolet-visible-near infrared region was designed, fabricated, and evaluated. A lens with reflective coating on the back surface is applying to replace the traditional lens-reflecting grating combination. The design concept and fabrication and alignment methods as well as the results of evaluations of the proposed spectrometer are described in detail. The advanced imaging spectrometer achieves high resolution in both spectral and spatial direction and low stray light at a high numerical aperture in the working waveband. The performance of this modified porotype is analyzed and evaluated. Results show the spectrometer is well suited for the remote sensing of the ocean color as well as for various agriculture and vegetation-related applications.

Development status of low temperature infrared detection technology

“…Concentric optical system is a common optical structure for infrared spectroscopy detection. Typical concentric optical structures include Dyson optical system and Offner optical system 29 . For the low-temperature infrared system of long band, the radiation signal is weak and the SNR is high.…”

Colorimetric characterization of digital camera for the ocean surface imaging using a two-step training method

“…The faithful color imaging of the ocean surface plays an important role in many civil and military domains such as the ship camouflage, the ocean target detection and recognition, the ocean scene simulation, and so on [1][2][3] . However, the color characterization of the digital camera for the ocean surface imaging is a difficult work, because the color of the ocean surface was influenced by various factors such as the measurement geometry, the illumination condition, the pattern of the ocean surface, the composition of the ocean water, the depth of the ocean bottom, and so on.…”

Compact Numerical Aperture 0.5 Fiber Optic Spectrometer Design Using Active Image Plane Tilt

“…Some studies have proposed modified a large aperture CT configuration [ 17 , 18 , 19 , 20 ], but the relative aperture is still lower than 1/2.5 (corresponding to NA0.2), and at the same time, the complexity of the optical configuration will increase significantly. Curved surface grating-based spectrometer configurations like Dyson and Offner can offer high NA and FOV [ 21 , 22 , 23 ], but their expensive diffraction devices make them unsuitable for simple fiber optic spectrometers. Additionally, convex surface grating-based spectrometers are unable to achieve very high NA due to difficulties in avoiding grating occultation [ 23 ].…”