The prime-focus spectrometer: A new design concept |
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| Affiliation: | 1. Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, 98009, Sarawak, Malaysia;2. Petroleum, and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Brunei Darussalam;3. Graphene & Advanced 2D Materials Research Group (GAMRG), School of Science and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500, Subang Jaya, Selangor, Malaysia;4. Department of Chemical Process Engineering, Malaysia-Japan International Institute of Technology (MJIIT) Universiti Teknologi Malaysia (UTM), Jalan Sultan Yahya Petra, 54100, Kuala Lumpur, Malaysia;1. Institute of Chemistry, Federal University of Rio Grande do Norte, 59078-970, Natal, RN, Brazil;2. Health and Education Center, Federal University of Campina Grande, 58175-000, Cuité, PB, Brazil;1. Bournemouth University, Department of Life and Environmental Sciences, Talbot Campus, Poole, Dorset, BH12 5BB, United Kingdom;2. The PanEco Foundation - Sumatran Orangutan Conservation Programme, Chileweg 5, Berg am Irchel 8415, Switzerland;3. Southern Illinois University, Department of Anthropology, 1000 Faner Drive, Carbondale, IL, 62901, USA;4. Syiah Kuala University, Department of Biology, Banda Aceh 23111, Indonesia;5. Liverpool John Moores University, School of Natural Sciences and Psychology, L33AF, Liverpool, United Kingdom;6. University of Amsterdam, Institute for Biodiversity and Ecosystem Dynamics, Sciencepark 904, Amsterdam 1098, Netherlands;7. Aarhus University, Aarhus Institute of Advanced Studies (AIAS), Høegh-Guldbergs Gade 6B, DK-8000 Aarhus C, Denmark;1. Hematology Service and Service of Clinical Pathology, Geneva University Hospitals, Geneva, Switzerland;2. Analytical Immunology for chronic pathologies, Albert Bonniot Institute, INSERM/University Joseph Fourier U823, Grenoble, France;1. College of Environmental and Chemical Engineering, Shanghai University of Electric Power, 2588 Changyang Road, Shanghai, 200090, China;2. Shanghai Ahill Chemical Products Co., Ltd, 1038 Guoshun Road, Shanghai, 200090, China |
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| Abstract: | In a reflector, the light loss is at a minimum at the prime focus, but it is too awkward to mount a spectrometer of any size there. In this paper, I propose to place the slit at the prime focus to be followed immediately by a collimating mirror as shown in Fig. 1. The collimated beam diameter can be as large as one-ninth of the telescope aperture, and a maximum spectral resolving power of 105 can be achieved. This new design can replace with advantage the conventional Cassegrain spectrometer in all types of work. It is eminently suited for use in the next generation of telescopes such as the MMT and the single telescope array. |
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