Improvements in the calibration of the NOAA-20 VIIRS day-night band low gain stage using a solar diffuser

2020 ◽  
Author(s):  
Junqiang Sun ◽  
Xiaoxiong Xiong
Keyword(s):  
Gain Stage

scholarly journals Calibration of the passive cavity aerosol spectrometer probe for airborne determination of the size distribution

2013 ◽  
Vol 6 (3) ◽  
pp. 4123-4152 ◽  
Author(s):  
Y. Cai ◽  
J. R. Snider ◽  
P. Wechsler
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Scattered Light ◽  
Particle Diameter ◽  
Polystyrene Latex ◽  
Calibration Methods ◽  
Research Aircraft ◽  
Amplifier Gain ◽  
Gain Stage

Abstract. This work describes calibration methods for the particle sizing and particle concentration systems of the passive cavity aerosol spectrometer probe (PCASP). Laboratory calibrations conducted over six years, in support of the deployment of a PCASP on a cloud physics research aircraft, are analyzed. Instead of using the many calibration sizes recommended by the PCASP manufacturer, a relationship between particle diameter and scattered light intensity is established using three sizes of mobility-selected polystyrene latex particles, one for each amplifier gain stage. In addition, studies of two factors influencing the PCASP's determination of the particle size distribution – amplifier baseline and particle shape – are conducted. It is shown that the PCASP-derived size distribution is sensitive to adjustments of the sizing system's baseline voltage, and that for aggregate spheres, a PCASP-derived particle size and a sphere-equivalent particle size agree within uncertainty dictated by the PCASP's sizing resolution. Robust determination of aerosol concentration, and size distribution, also require calibration of the PCASP's aerosol flowrate sensor. Sensor calibrations, calibration drift, and the sensor's non-linear response are documented.

The μ-Follower Gain Stage (μ-F)

2008 ◽  
pp. 121-142
Author(s):  
Burkhard Vogel
Keyword(s):  
Gain Stage

The Common Cathode Gain Stage (CCS)

2013 ◽  
pp. 63-88 ◽  
Author(s):  
Burkhard Vogel
Keyword(s):  
The Common ◽  
Gain Stage

Cascade delta-sigma modulator with pseudo-differential comparator-based switched-capacitor gain stage

2007 ◽  
Vol 51 (3) ◽  
pp. 201-206 ◽  
Author(s):  
Dusan Prelog ◽  
Massoud Momeni ◽  
Bogomir Horvat ◽  
Manfred Glesner
Keyword(s):  
Switched Capacitor ◽  
Delta Sigma Modulator ◽  
Delta Sigma ◽  
Gain Stage

MEMS Pressure Sensor Array for Aeroacoustic Analysis of the Turbulent Boundary Layer

2008 ◽  
Author(s):  
Joshua S. Krause ◽  
Robert D. White ◽  
Mark J. Moeller ◽  
Judith M. Gallman ◽  
Richard De Jong
Keyword(s):  
Pressure Sensor ◽  
Sensor Array ◽  
Single Element ◽  
Lumped Element ◽  
Depth Analysis ◽  
Fluid Damping ◽  
Sensitivity Studies ◽  
Gain Stage ◽  
Acoustic Sensitivity

The design, fabrication, and characterization of a surface micromachined, front-vented, 64 channel (8×8), capacitively sensed pressure sensor array is described. The array was fabricated using the MEMSCAP PolyMUMPs® process, a three layer polysilicon surface micromachining process. An acoustic lumped element circuit model was used to design the system. The results of our computations for the design, including mechanical components, environmental loading, fluid damping, and other acoustic elements are detailed. Theory predicts single element sensitivity of 1 mV/Pa at the gain stage output in the 400–40,000 Hz band. A laser Doppler velocimetry (LDV) system has been used to map the spatial motion of the elements in response to electrostatic excitation. A strong resonance appears at 480 kHz for electrostatic excitation, in good agreement with mathematical models. Static stiffness measured electrostatically using an interferometer is 0.1 nm/V2, similar to the expected stiffness. Preliminary acoustic sensitivity studies show single element acoustic sensitivity (as a function of frequency) increasing from 0.01 mV/Pa at 200 Hz to 0.16 mV/Pa at 2 kHz. A more in depth analysis of acoustic sensitivity is ongoing.

Composer's Notebook: Star Networks at the Singing Point

2004 ◽  
Vol 14 ◽  
pp. 81-82
Author(s):  
Ralph Jones
Keyword(s):  
Chaos Theory ◽  
Analog Circuits ◽  
Feedback Loop ◽  
Tipping Point ◽  
Feedback Circuit ◽  
Star Network ◽  
Star Networks ◽  
Gain Stage

Star Networks at the Singing Point, poetic though it sounds, is merely a description in engineering terminology of the sound-producing method that forms the basis for the piece. A “star network” is a circuit node having three or more connections. The “singing point” is the particular tuning at which the gain in a feedback circuit produces oscillation. In Star Networks at the Singing Point, the performer creates analog circuits composed of multiple nodes, each of which has three or more connections—in essence, “mazes” having a number of paths through which current can flow. Connecting such a circuit in a feedback loop around a gain stage produces an oscillator that is inherently unstable. Tuned to what is called in chaos theory a “tipping point,” the circuit sings unpredictably of its own accord.

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