Optical Design for a Cubesat: Unobscured Telescope, Using Freeform Mirrors and a Curved Detector

Muslimov, Eduard; Hugot, Emmanuel; Ferrari, Marc; Behaghel, Thibault; Pavlycheva, N. K.

doi:10.3103/s1068799818010014

Cited by 3 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To analyse the concept mentioned above, we consider a 6U CubeSat inside which 2.5U are allocated to the optical relay, 1U to the dichroic splitting the visible and infrared channels and the two cameras, and the remaining to electronics, ADCS and motors. To collect the stellar radiation we consider a compact 3-mirrors optical relay, similar to those proposed already in a number of CubeSat design ([4] - [8]) providing roughly an f/6 system with a FoV of 0.16 degrees -key specifications in Table 1.…”

Section: Cubesat Conceptmentioning

confidence: 99%

A calibration cover for multi-spectral space instruments

Baccichet¹,

Aló²,

Gulde³

et al. 2021

International Conference on Space Optics — ICSO 2020

View full text Add to dashboard Cite

The study of many astrophysical objects relies on repeated measurements of specific areas of the sky to allow, for example, the identification of transient phenomena, or of targets of interest extracted automatically from a large set of observations. A key aspect coming to play in these cases, is the stability of the measurement system that allows data to be traceable and comparable over time, which in turn leads to the necessity of a reliable and stable calibration.Observations from space allows for an intrinsically more stable environment due to the absence of ground-generated disturbances, leading to a less complex calibration system to correct for effects such as ageing of optics/detectors or temperature variations in the instrument. In this context, making use of external sources reduces further the need for internal devices, minimizing the impact of calibration in the design of a spacecraft.In this paper we present the performance of a device that takes advantage of these aspects and makes use of the sun to passively generate calibration scenes at visible and infrared wavelengths, with a single part. It consists on a movable cover placed at the entrance pupil of a telescope, with pinhole inserts and a black-coated internal surface. Sunlight passing through the pinholes is used to generate a flat field at visible wavelengths, while by heating the inner surface an infrared uniform scene can be formed.We apply this concept to a case-study for a small-sized satellite (e.g. 6U CubeSat) showing a good relative stability with such system in both IR and VIS bands, over the course of a 2-3 years mission.

show abstract

Section: Cubesat Conceptmentioning

confidence: 99%

A calibration cover for multi-spectral space instruments

Baccichet¹,

Aló²,

Gulde³

et al. 2021

International Conference on Space Optics — ICSO 2020

View full text Add to dashboard Cite

show abstract

“…One such technological development is curved detectors: while they are widespread in the biological world, in the form of the eye's retina [15], curved numerical sensors are a relatively new innovation [14]. Their use can lead to a reduced number of optical elements and lower aberrations in a given optical system [26,31], with applications ranging from telescopes [12], satellites [22] and cell phone cameras [25], where space is at a premium, to ultraviolet imaging [13], where a significant fraction of incoming light is absorbed by optical elements. In addition to simplifying some optical systems, curved detectors can also be used to properly image a curved objects.…”

Section: Introductionmentioning

confidence: 99%

High resolution, wide field optical imaging of macaque visual cortex with a curved detector

et al. 2022

View full text Add to dashboard Cite

Objective. Cortical activity can be recorded using a variety of tools, ranging in scale from the single neuron (microscopic) to the whole brain (macroscopic). There is usually a trade-off between scale and resolution; optical imaging techniques, with their high spatio-temporal resolution and wide field of view, are best suited to study brain activity at the mesoscale. Optical imaging of cortical areas is however in practice limited by the curvature of the brain, which causes the image quality to deteriorate significantly away from the center of the image. Approach. To address this issue and harness the full potential of optical cortical imaging techniques, we developed a new wide-field optical imaging system adapted to the macaque brain. Our system is composed of a curved detector, an aspherical lens and a ring composed of LEDs providing uniform illumination at wavelengths relevant for the different optical imaging methods, including intrinsic and fluorescence imaging. Main Results. The system was characterized and compared with the standard macroscope used for cortical imaging, and a 3-fold increase of the area in focus was measured as well as a 4-fold increase in the evenness of the optical quality in vivo. Significance. This new instrument, which is to the best of our knowledge the first use of a curved detector for cortical imaging, should facilitate the observation of wide mesoscale phenomena such as dynamic propagating waves within and between cortical maps, which are otherwise difficult to observe due to technical limitations of the currently available recording tools.

show abstract

“…In this paper we will consider both freeform optical surfaces and freeform detector to build an all-reflective unobscured TMA telescope. We propose this solution for CubeSat mission to monitor space weather and enlarge it to potential drones for solar system planets surveillance in low orbit [9,10] , since large field of view and high resolution of the system can be achieved. In the beginning of the paper, three versions of TMA telescopes are designed, and their imaging performance are evaluated and compared.…”

Section: Introductionmentioning

confidence: 99%

Innovative optical design combining freeform optics and curved-freeform sensors

Liu

Lombardo

Muslimov

et al. 2022

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V

View full text Add to dashboard Cite

Innovative optical designs combing freeform optics and curved freeform sensors will be key elements to improve the optical performance and reduce the overall manufacturing and testing pressure of optical complex systems. In this paper, three version of unobscured all-reflective TMA-type telescopes (D=10cm, FOV=7°×7°) will be designed separately with flat sensor, spherical sensor and freeform sensor. Then, we will analyze and compare their imaging quality (RMS spot radius) and surface complexity (PV sag departure and Max slop departure) to demonstrate the advantage of freeform sensor applied in the off-axis optical system. Finally, we make comparison on sensitivity analysis of surface error between mirror surfaces and freeform sensor surfaces to prove that the manufacturing pressure of the sensor did not increase even though its surface complexity increased. We expect that such a design has a great potential to be applied in the space weather monitoring and solar system planetary exploration drones.

show abstract

Optical Design for a Cubesat: Unobscured Telescope, Using Freeform Mirrors and a Curved Detector

Cited by 3 publications

References 11 publications

A calibration cover for multi-spectral space instruments

A calibration cover for multi-spectral space instruments

High resolution, wide field optical imaging of macaque visual cortex with a curved detector

Innovative optical design combining freeform optics and curved-freeform sensors

Contact Info

Product

Resources

About