Far-infrared spectroscopy of the troposphere (FIRST): sensor development and performance drivers

Bingham, Gail E.; Latvakoski, Harri; Wellard, Stanley J.; Mlynczak, Martin G.; Johnson, David G.; Traub, Wesley A.; Jucks, K. W.

doi:10.1117/12.509674

Cited by 6 publications

(4 citation statements)

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“…The FIRST instrument is a Fourier transform interferometer with a germanium-on-polypropylene thin film beam splitter to provide a spectral resolution of 0.643 cm −1 and a spectral response over the required 100-1000 cm −1 spectral range [7]. As will be shown below, FIRST response is from 4.54 to 200 μm, 2200 to 50 cm −1 .…”

Section: First Instrument Descriptionmentioning

confidence: 99%

Far-infrared spectroscopy of the troposphere: instrument description and calibration performance

Latvakoski¹,

Mlynczak

Johnson

et al. 2013

Appl. Opt.

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The far-infrared spectroscopy of the troposphere (FIRST) instrument is a Fourier transform spectrometer developed to measure the Earth's thermal emission spectrum with a particular emphasis on far-infrared (far-IR) wavelengths greater than 15 μm. FIRST was developed under NASA's Instrument Incubator Program to demonstrate technology for providing measurements from 10 to 100 μm (1000 to 100 cm(-1)) on a single focal plane with a spectral resolution finer than 1 cm(-1). Presently no spectrometers in orbit are capable of directly observing the Earth's far-IR spectrum. This fact, coupled with the fundamental importance of the far-IR to Earth's climate system, provided the impetus for the development of FIRST. In this paper the FIRST instrument is described and results of a detailed absolute laboratory calibration are presented. Specific channels in FIRST are shown to be accurate in the far-IR to better than 0.3 K at 270 K scene temperature, 0.5 K at 247 K, and 1 K at 225 K.

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Section: First Instrument Descriptionmentioning

confidence: 99%

Far-infrared spectroscopy of the troposphere: instrument description and calibration performance

Latvakoski¹,

Mlynczak

Johnson

et al. 2013

Appl. Opt.

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“…Infrared interferometer spectroscopy [7] is an application of particular interest for this device [8]. In previous works we presented a new concept of a superconducting noncontact linear slider for precision positioning of a optic mirror cube as part of the mechanisms required in far infrared interferometry [21,22]. In addition, the slider can also be used as a low-maintenance, highreliability sliding kinematic joint for space application due to the lack of contact and its self-stability [23,24].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a Superconducting Linear Slider

Valiente–Blanco¹,

Pérez-Díaz

Díez-Jiménez

2015

Journal of Vibration and Acoustics

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In this paper, the dynamic behavior of a one degree-of-freedom (DOF) contactless linear slider based on superconducting magnetic levitation is experimentally analyzed. The device is intended for precision positioning of an optic mirror in cryogenic environments. Different prototypes of this device have been tested at cryogenic temperatures (77 K), and their mechanical behavior characterized in the sliding direction for forced and unforced oscillations. Experimental results reveal that the slider is self-stable at the initial equilibrium position and the dynamic behavior fits well an underdamped harmonic oscillator. Finally, the device showed great potential for horizontal vibration isolation, acting as a low-pass filter with a resonance at about 0.9 Hz.

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“…Table 1 lists the basic FIRST instrument parameters. A complete description of the instrument and basis for the design is provided elsewhere [7,9]. The noiseequivalent temperature difference NEΔT in the table is for a single spectrum of a target.…”

Section: Introductionmentioning

confidence: 99%

Far-infrared spectroscopy of the troposphere: calibration with a cold background

Latvakoski¹,

Mlynczak

Cageao

et al. 2014

Appl. Opt.

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The far-infrared spectroscopy of the troposphere (FIRST) instrument is a Fourier-transform spectrometer developed to measure the Earth's thermal emission spectrum with a particular emphasis on the far-infrared. FIRST has observed the atmosphere from both the ground looking up and from a high-altitude balloon looking down. A recent absolute laboratory calibration of FIRST under ground-like operating conditions showed accuracy to better than 0.3 K at near-ambient temperatures (270-325 K) but reduced accuracy at lower temperatures. This paper presents calibration results for balloon-flight conditions using a cold blackbody to simulate the space view used for on-board calibration. An unusual detector nonlinearity was discovered and corrected, and stray light was measured and removed. Over most of the range of Earth scene temperatures (205-300 K), the accuracy of FIRST is 0.35-0.15 K (one sigma).

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Far-infrared spectroscopy of the troposphere (FIRST): sensor development and performance drivers

Cited by 6 publications

References 0 publications

Far-infrared spectroscopy of the troposphere: instrument description and calibration performance

Far-infrared spectroscopy of the troposphere: instrument description and calibration performance

Dynamics of a Superconducting Linear Slider

Far-infrared spectroscopy of the troposphere: calibration with a cold background

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