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Quantitative analysis of temporal stability and instrument performance during field experiments of an airborne QCLAS via Allan–Werle-plots
Allan–Werle-plots are an established tool in infrared absorption spectroscopy to quantify temporal stability, maximum integration time and best...
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Stabilizing diode laser to 1 Hz-level Allan deviation with atomic spectroscopy for Rb four-level active optical frequency standard
We achieve a compact ultra-stable 420 nm blue diode laser system by immediately stabilizing the laser on the hyperfine transition line of Rb atom....
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Frequency Stability
The stability of clock largely depends on its underlying oscillator. A clock’s time can be mathematically described as the phase of an oscillator of...
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Photonic Microwave Oscillator with Reduced Phase Noise at Small Offsets from the Carrier Frequency
AbstractWe have developed a transportable laboratory sample of a photonic microwave oscillator (PMO) based on an optical frequency standard (He–Ne/CH
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Synchronous detection of CO2 and CH4 gas absorption spectroscopy based on TDM and optimized adaptive Whittaker-Henderson filtering algorithm
A cavity ring-down spectroscopy (CRDS) system based on the time-division multiplexing (TDM) and an improved Whittaker-Henderson (W-H) filtering...
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Application of Statistical Tools to Optimize a Dual Source Electrical High Dc Resistance Bridge
At the Istituto Nazionale di Ricerca Metrologica (INRIM), a commercial dual source high resistance bridge has been optimized by means of the...
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Error in Overlap Estimation of Allan Variance
We obtain the dependence of the error variation of the overlap estimate of the Allan variance on the overlap coefficient in a given observation time...
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Explorative Research on 100 mW Magnitude Optical Frequency Transmission Via Fiber
In this work, we investigate the optical frequency transmission with a magnitude of 100 mW through a 20 m polarization-maintaining fiber, using the...
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Simultaneous detection of CF4 and SIF4 using external cavity quantum cascade laser absorption spectroscopy
Direct and quantitative access to plasma etch processes (like the concentration of precursors or of molecular etch products) plays a key role for the...
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Insights from underground laboratory observations: attenuation-induced suppression of electromagnetic noise
This study involved synchronous observations of electromagnetic (EM) fields at both ground level (+ 22 m above sea level) and a depth of − 848 m...
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Improvement of rotation rate sensitivity in a double moving mirrors cavity of a quantum optomechanical gyroscope
In this article, we have presented a design of a quantum optomechanical gyroscope, consisting of a Michelson interferometer on a rotating table. An...
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Influence of the Dynamic Goniometer’s Bearing Unit on the Measurement Error
In order to improve the accuracy of the dynamic goniometer, the influence of its bearing unit on the measurement error has been studied. The spectral...
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An Artificial Neural Network Model for Timescale Atomic Clock Ensemble Algorithm
Atomic clocks work on a standard frequency generated by the electron transitions in the atoms of the core material. A timescale is a reference...
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Highly-Sensitive H2O Sensor Exploiting a 1.39 μm Near-Infrared Distributed-Feedback Laser Diode
We use a 1392 nm distributed-feedback laser diode to develop a highly-sensitive optical gas sensor. The sensor is based on quartz-enhanced...
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A Method to Determine the Rate Random Walk Coefficient of Fiber Optic Gyroscope
The mechanism of FOG’s (fiber optic gyroscope) RRW (rate random walk) is not clear; there are few researches on the estimation of FOG’s RRW...
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A portable N2O sensor based on quartz-enhanced photoacoustic spectroscopy with a distributed-feedback quantum cascade laser for medical and atmospheric applications
A portable sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported to analyze trace gases. QEPAS is a high sensitivity and...
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Delocalization of Polymers in Lower Tail Large Deviation
Directed last passage percolation models on the plane, where one studies the weight as well as the geometry of optimizing paths (called polymers) in...
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Distribution Function for Estimates of Allan Variance: Theory and Practice
We obtain analytic expressions for normalized autocorrelation functions of frequency variations for the main types of noise in frequency...
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Method of Translation Transfer for Estimation of Stability of a Nonstationary Quantum Frequency Standard
AbstractA continuous wavelet transform is used to analyze operation of a nonstationary signal of a quantum frequency standard. A method of...
