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A New Pointing System for the SPS instrument for Balloon and Space Applications

Zahra Vaziri1, Tom McElroy1, David Barton1

1York University, 4700 Keele St., Toronto, Ontario, M3J 1P3, Canada

1. www.physikinstrumente.com 2. Strong, K. & et. al., 2002. The MANTRA 2002 Balloon Flight From Vanscoy, Canada. Proc. of Envisat Validation

Workshop,. 3. Principal Investigator, Professor Charles Thomas (Tom) McElroy, A Balloon-based Demonstrator for the PHEOS-

Wheather, Climate and Air Quality Imaging Fourier Transform Spectrometer (IFTS), An application to : Flights for the Advancement of Science and Technology (FAST 2013).

References

In order to validate the ozone data from ground-

based Brewer instruments and satellite-based

instruments measuring ozone, a series of balloon-

based experiments will be conducted. The SPS

(SunPhotoSpectrometer) will be flown on board the

PARABLE (Payload for Remote sounding of the

Atmosphere using Balloon Limb Experiments)

training program. In order to achieve fine sun

tracking for spectrometer based instruments

onboard balloon experiments or satellite missions a

new pointing system is being designed and built.

PARABLE will act as a balloon platform flying at 35-

40km to conduct measurements of trace gases and

aerosols using solar occultation and limb

measurements.

The pointing system acts as fine tuning for the sun

tracking platform on which SPS will be flying on. This

sun tracker could be a solar tracking satellite or a

solar tracking balloon gondola. In order to add an

extra 5-10% accuracy to the tracker, an additional

pointing system is designed for the SPS on board the

gondola.

Introduction The requirements for such a pointing system are:

± 2.5° to ± 5.0° travel range angle

10Hz frequency

Small and light weight

Simple and space qualified

Based on a two axis tilt mirror concept

Comprised of three panels, four voice coil motors and four pivot points or hinges.

Maximum travel range angle: ± 2.5° and including the reflection the ability to track over ±5.0°.

Material: aluminum.

Motor: Voice coil (Magnetic)

Hardware Design

The pointing system will be mounted on the instrument

and an additional mirror will guide the sun beam into the

instrument aperture.

A small camera will be placed in proximity of the

instrument aperture and will act as the feedback to the

software controlling the pointing system.

Assembly

Improve the travel range angle to ±5°

o Build and design a custom made curved voice coil motor.

Write control software for the pointing system.

Testing:

o Mount on a sun-tracker with 5% error from the direction of the sun and have the pointing system find the sun.

Fly SPS and pointing system on the PARABLE mission.

Utilise the pointing system for new instruments such as an Imaging Fourier Transform Spectrometer (IFTS) which is part of the FAST (Flights for the Advancement of Science and Technology) project.

Future Work

Picture

Axis Mirror

Diameter (mm)

Tilt Angle (Degree)

Frequency (Hz)

Mass (g)

Dimension (mm)

Piezo Electric Tilt Mirror

PI S334

2 10 ±2.8 50 65 25x33x38

P-528 Piezo Z/Tip/Tilt Stage

3 250-300 ±0.07 - 1420 150x150x30

H-811 Miniature Hexapod

6 100 ±10, ±10,

±21

- (velocity of 10mm/s or

14.3°/s)

2200 136x136x114

Tilt Mirror Pointing System

2 152 ±2.5 10 931 131x152x152

SPS (right) and MAESTRO (left) mounted on a sun-tracker at PEARL station in Eureka, Canada

MANTRA mission launch in 2002 similar to the PARABLE mission balloon.

Design for a curved voice coil motor.

Mechanical design of the pointing system.

Mounting the pointing system on SPS.

Prototype of the pointing system machined from

aluminum.