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Home Science & Environment Space Exploration

Tuning a NASA Instrument: Calibrating MASTER

June 11, 2025
in Space Exploration
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NASA’s Ames Research Center in Silicon Valley houses a unique laboratory: the Airborne Sensor Facility (ASF). The engineers at the ASF are responsible for building, maintaining, and operating numerous instruments that get deployed on research aircraft, but one of their most important roles is instrument calibration.

Think of calibration like tuning a piano between performances: A musician uses a tuner to set the standard pitch for each string, ensuring that the piano remains on pitch for every concert.

The “tuners” at ASF include lasers, mirrors, and a light source called an integrating sphere – a hollow sphere about 36 inches in diameter that emits a set amount of light from a hole in the top. By checking an instrument against this baseline between each mission, engineers ensure that the instrument sensors provide accurate, reliable data every time.

In the photo above, electrical engineer Nikolas Gibson performs calibration tests on the MODIS/ASTER Airborne Simulator (MASTER) spectrometer, co-developed by NASA Ames and NASA’s Jet Propulsion Laboratory in Southern California.

A spectrometer separates light into individual wavelengths, providing researchers with information about the properties of whatever is creating or interacting with that light. The MASTER instrument measures about 50 individual spectral channels, providing data on wavelengths from the visible spectrum through the infrared.

When it comes to calibration, each of these channels functions like a specific key on a piano and needs to be individually checked against the “tuner.” By pointing the instrument’s sensor at a known quantity of light coming from the integrating sphere, the team checks the accuracy of MASTER’s data output and repairs or adjusts the sensor as needed.

In this image, MASTER had returned from an April 2025 scientific campaign observing  prescribed fires in Alabama and Georgia with NASA’s FireSense project. It was recalibrated before heading back into the field for the Geological Earth Mapping Experiment, or GEMx,  mission in late May 2025, which will use the instrument to help map critical minerals across the southwestern United States.

Tags: Ames Research CenterAmes Research Center's Science DirectorateScience Instruments
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