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KV

K. V. Sriram

Indian Space Research Organisation

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M. P. Kothiyal

Indian Institute of Technology Madras

R. S. Sirohi

Kurukshetra University

Rajpal S. Sirohi

Alabama Agricultural and Mechanical University

R. Venkateswaran

Indian Space Research Organisation

Tayaramma D. P. V. Jalluri

Indian Space Research Organisation

B. Rudraswamy

Bangalore University

S. P. Karanth

Indian Space Research Organisation

M. A. Sumesh

Indian Space Research Organisation

Venkateswaran Ramaswamy

Indian Space Research Organisation

Rama Subrahmanyam

Wind Power Engineering (Japan)

Cooperative Institutions

Indian Space Research Organisation

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

Istituto Nazionale di Fisica Nucleare

Manipal Academy of Higher Education

Indian Institute of Technology Madras

Indian Institute of Technology Delhi

Indian Institute of Astrophysics

Bangalore University

Indian Institute of Technology Indore

Electro Optical Systems (Germany)

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A Compact THz Photometer for Solar Flare Burst Studies from Space

Deleted Journal (2024)

M. A. Sumesh S. P. Karanth K. V. Sriram

Recent solar flare observations reveal the presence of THz components having a few orders of magnitude higher amplitude than the Radio Frequency (RF) and microwave radiations in the solar flare spectrum. This feature makes it remarkably beneficial for the detection of solar flares of low magnitudes such as Geostationary Operational Environmental Satellite (GOES) Class C, and M flares. Hence, space agencies including National Aeronautics and Space Administration (NASA) and European Space Agency (ESA) are gearing up with THz instruments for solar flare observations. In line with this, Laboratory for Electro-Optics Systems (LEOS) has completed the development of a photometer that operates in continuum THz band, from 1.5 to 15 THz. The entire electro-opto-mechanical design was carried out to realize a compact, light-weight and power-efficient photometer to meet the size, mass and power constraints posed by inherent resource limitations of experimental satellite platforms such as Nanosatellite, Microsatellite and Polar Satellite Launch Vehicle’s 4th Stage Orbital Platform (PS4-OP). A Cassegrain optical configuration was designed to collect the sun radiation with an aperture effective area of 0.0027 m2 with ceramic low pass filters and resonant mesh filter for selective perception of THz radiation, rejecting the huge background of visible and Near Infrared (NIR) with a spectral selectivity of 107:1. Sensitivity of the Photometer was estimated to be 41.5 K/mV in 1.5 to 15 THz band by calibration using a blackbody radiation source. The radiometric resolution of the payload is 125 Solar Flux Unit (SFU) (1 SFU=1×10-22 Wm-2Hz-1). The payload was successfully developed and space-qualified for its deployment in Nanosatellite or PS4-OP platform.

Photometer

Cassegrain reflector

Solar flare

10.47852/bonviewjopr42021899

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Direct determination of focal length by using Talbot interferometry

Applied Optics (1992)

K. V. Sriram M. P. Kothiyal Rajpal S. Sirohi

A new and simple technique for the determination of the focal length of positive lenses and concave spherical surfaces by Talbot interferometry is described. Results of measurements are presented. We show that high measurement accuracy can be achieved with this technique.

Talbot effect

10.1364/ao.31.005984

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Chandrayaan-3 LIBS Sensor: Pre-flight Characterization, Inflight Operations and Preliminary Observations

IEEE Sensors Journal (2024)

R.V.L.N. Sridhar Adwaita Goswami K. A. Lohar S. Malathi K. V. Sriram

Characterization

10.1109/jsen.2024.3506037

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Invention of Indian Moon Soil (Lunar Highland Soil Simulant) for Chandrayaan Missions

International Journal of Geosynthetics and Ground Engineering (2020)

I. Venugopal Kasinathan Muthukkumaran K. V. Sriram S. Anbazhagan T. Prabu

Lunar soil

10.1007/s40891-020-00231-0

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Improved performance of Three Mirror Anastigmat Telescope with Freeform Surface: Optical Design, Testing and Validation Aspects

Vishweshwar Rao B.K. V. Sriram Narayanamurthy C.S

10.1016/j.ijleo.2024.171998

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Formulation and optimization of copper selenide/PANI hybrid screen printing ink for enhancing the power factor of flexible thermoelectric generator: A synergetic approach

Ceramics International (2024)

Ramakrishna Nayak Prakash Shetty M. Selvakumar Ashok Rao K. V. Sriram

Thermoelectric generator

Power density

10.1016/j.ceramint.2024.04.315

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Citations (2)

Simulation of A Wedge Plate Interferometer Using Holo Optical Elements

Journal of Optics (1991)

K. V. Sriram V. Parthiban M. P. Kothiyal R. S. Sirohi

Wedge (geometry)

10.1007/bf03549228

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Characterization of thermal sprayed Si on sintered SiC for space optical applications

Surface Engineering (2020)

Tayaramma D. P. V. Jalluri Santhosh Somashekar Arjun Dey R. Venkateswaran Sangeethkumar Elumalai

Silicon carbide (SiC) ceramic exhibits several outstanding properties, such as superior chemical and thermal stabilities, high radiation resistance and low thermal expansion, that qualify it as a prime candidate for space applications. Optical quality with surface figure accuracy of the order of 60 nm peak-to-valley (PV) and micro-roughness (root-mean-square, RMS) less than 2 nm is necessary for space optical applications. Sintered SiC (α-HCP) is inherently porous and challenging to make high-grade optics. Hence, it calls for a surface modification of the sintered SiC by means of a clad layer that has superior adhesion to the substrate and facilitates optical polishing. This paper describes a typical method of synthesis and characterization of a thick silicon coating on sintered SiC substrate, directly machinable to aspheric for optical telescope applications. Present approach describes the quantitative opto-mechanical characterization of silicon film over SiC by thermal spray coatings, eventually leading to its space flight-worthiness.

Characterization

10.1080/02670844.2020.1803718

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Citations (12)

Optical Measurements Using Talbot Interferometry

Journal of Optics (1992)

K. V. Sriram M. P. Kothiyal R. S. Sirohi

Talbot effect

10.1007/bf03549241

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Citations (1)

Photoluminescence and nonlinear optical investigations on Eu2O3 doped sodium bismuth borate glasses for solid state lighting and near-infrared optical limiting applications

Infrared Physics & Technology (2021)

Tayaramma D. P. V. Jalluri K. V. Sriram B. Rudraswamy Vinod Hegde G. Devarajulu

Europium

Bismuth

Two-Photon Absorption

10.1016/j.infrared.2021.103784

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Citations (28)