«hygrometers»
۲۹۱ نتیجهAccuracy of tropospheric and stratospheric water vapor measurements by the cryogenic frost point hygrometer: Instrumental details and observations
[1] The cryogenic frost point hygrometer (CFH), currently built at the University of Colorado, is a new balloon borne hygrometer, which is capable of continuously measuring water vapor between the surface and the middle stratosphere. The design is loosely based on the old NOAA/CM
Uncertainty Due to Hygrometer Sensor in Eddy 1 Covariance Latent Heat Flux Measurements
9 Half-hour latent heat flux (LE) was measured over an early-maturing peach orchard 10 (Prunus persica L.) by two different hygrometers: 1) infrared gas analyzer (IRGA) (Li11 COR, model Li-7500); and 2) ultraviolet hygrometer (Campbell, KH20). A good 12 agreement between LE obtai
Performance of WVSS-II hygrometers on the FAAM research aircraft
We compare the performance of five hygrometers fitted to the Facility for Airborne Atmospheric Measurement’s (FAAM) BAe 146-301 research aircraft using data from approximately 100 flights executed over the course of 2 years under a wide range of conditions. Bulk comparison of clo
SEALDH-II—An Autonomous, Holistically Controlled, First Principles TDLAS Hygrometer for Field and Airborne Applications: Design–Setup–Accuracy/Stability Stress Test
Instrument operation in harsh environments often significantly impacts the trust level of measurement data. While commercial instrument manufacturers clearly define the deployment conditions to achieve trustworthy data in typical standard applications, it is frequently unavoidabl
Evaluation of the MOZAIC Capacitive Hygrometer during the airborne field study CIRRUS-III
The MOZAIC Capacitive Hygrometer (MCH) is usually operated aboard passenger aircraft in the framework of MOZAIC (Measurement of Ozone by Airbus In-Service Aircraft) for measuring atmospheric relative humidity (RH). In order to evaluate the performance of the MCH, the instrument w
Fiber Optic Thermo-Hygrometers for Soil Moisture Monitoring
This work deals with the fabrication, prototyping, and experimental validation of a fiber optic thermo-hygrometer-based soil moisture sensor, useful for rainfall-induced landslide prevention applications. In particular, we recently proposed a new generation of fiber Bragg grating
Advancements, measurement uncertainties, and recent comparisons of the NOAA frost point hygrometer
The NOAA frost point hygrometer (FPH) is a balloon-borne instrument flown monthly at three sites to measure water vapor profiles up to 28 km. The FPH record from Boulder, Colorado, is the longest continuous stratospheric water vapor record. The instrument has an uncertainty in th
Correction of thermal gradient errors in stem thermocouple hygrometers.
Stem thermocouple hygrometers were subjected to transient and stable thermal gradients while in contact with reference solutions of NaCl. Both dew point and psychrometric voltages were directly related to zero offset voltages, the latter reflecting the size of the thermal gradien
Automatic calibration system of thermo-hygrometers
Abstract Machine vision technology is an interdisciplinary subject involving plenty of fields such as artificial intelligence, neurobiology, psychophysics, computer science, image processing and pattern recognition, etc. In recent years, with rapid development the technology, mac
Photoacoustic hygrometer for icing wind tunnel water content measurement: design, analysis, and intercomparison
Abstract. This work describes the latest design, calibration and application of a near-infrared laser diode-based photoacoustic (PA) hygrometer developed for total water content measurement in simulated atmospheric freezing precipitation high ice conditions with relevance fundame