@InProceedings{MuralikrishnaDomiHornDosS:2018:NeCoLo,
author = "Muralikrishna, Polinaya and Domingos, Sinval and Horna,
Andr{\'e}s Fernandes Paredes and Dos Santos, Walter
Abrah{\~a}o",
affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "A new compact and low cost langmuir probe and associated onboard
data handling system for cubesat",
year = "2018",
organization = "Cospar Scientific Assembly, 42.",
abstract = "A new compact and low cost Langmuir Probe and associated onboard
data handling system are being developed at Instituto Nacional de
Pesquisas Espaciais for launching on board one of the future 2U
CubeSat missions. The system is a simplified and compacted version
of the Langmuir Probe payloads launched on board several Brazilian
SONDA III rockets and also developed for the Brazilian scientific
satellites SACI-1 and SACI-2. The onboard data handling system
will have the dual functions of preprocessing the data collected
by the Langmuir Probe and acting as the interface between the
experiment and the on board computer. The Langmuir Probe sensor in
the form of two rectangular stainless steel strips of total
surface area of approximately 80cm2 will be deployed soon after
the injection of the CubeSat into orbit. A sweep voltage varying
linearly from 0V to 3.0V in about 1.5 seconds and then remaining
fixed at 3.0V for 1 second will be applied to the LP sensor to
obtain both the electron density and electron temperature. A high
sensitivity preamplifier will be used to convert the sensor
current expected to be in the range of a few nano amperes to a few
micro amperes into a varying potential. In order to cover the
large dynamic range of the expected sensor current the
preamplifier output will be further amplified by a logarithmic
amplifier before being sampled and sent to the data handling
system. The data handling system is projected to handle 8 analog
channels and 4 digital words of 8 bits each. The incoming data
will be stored in a RAM and later sent to the on board computer
using a serial RS422 communication protocol. The interface unit
will process the telecommands received from the on board computer.
The interface is also projected to do FFT analysis of the LP
sensor data and send the averaged FFT spectral amplitudes in place
of the original unprocessed data. The system details are presented
here.",
conference-location = "Pasadena, California",
conference-year = "14-22 July",
language = "en",
targetfile = "murali_new.pdf",
urlaccessdate = "27 abr. 2024"
}