Topic
Variometer
About: Variometer is a research topic. Over the lifetime, 60 publications have been published within this topic receiving 241 citations. The topic is also known as: rate of climb and descent indicator & RCDI.
Papers published on a yearly basis
Papers
TL;DR: A three-component recording magnetic variometer has been designed and constructed for field use as discussed by the authors, which can be built in a research instrument shop at low enough cost so that simultaneous recording over an array of twenty or more instruments is possible on a moderate research budget.
Abstract: A three-component recording magnetic variometer has been designed and constructed for field use. It can be built in a research instrument shop at low enough cost so that simultaneous recording over an array of twenty or more instruments is possible on a moderate research budget. The design is classical, the angular positions of three magnets suspended on torsion wires being recorded photographically at ten second intervals. The resolution is better than one gamma and variations of period greater than one minute are well recorded. The variometer records unattended for three weeks on power from modest batteries. A cardinal point of the design is the construction of the instrument in a long narrow tubular case of aluminum. In use it stands vertically in a hole drilled in soil so that the suspended magnets are efficiently thermostatted. In addition, first-order thermal compensation is provided. Tests of the prototype and of eight similar variometers have shown no detectable interaction between the suspended magnets, no measurable effect of temperature changes of the air above the ground, and acceptable rates of drift, and have established that the variometer is a reliable and effective instrument for field study of local conductivity anomalies.
79 citations
TL;DR: In this paper, a technique for finding and estimating the locations of atmospheric thermals for the purpose of exploiting the updraft energy to enable the aircraft to remain aloft while reducing or eliminating the need to expend fuel or energy and operational regardless of whether the aircraft is under powered flight or is gliding.
Abstract: A technique for finding and estimating the locations of atmospheric thermals for the purpose of exploiting the updraft energy to enable the aircraft to remain aloft while reducing or eliminating the need to expend fuel or energy and operational regardless of whether the aircraft is under powered flight or is gliding.
16 citations
TL;DR: In this article, the authors proposed a method based on the DIDD technology for the determination of the reference frame of a portable recording station, based on real records measured during the joint Hungarian-Croatian repeat station survey.
Abstract: One of the main challenges on the course of the repeat station surveys is to determine the spatial differences of the geomagnetic elements between the repeat stations and the reference observatory. The difficulty arises from the fact, that the directly obtained differences are affected not only by spatial but also by temporal effects of external origin. The error deriving from the external effects can be efficiently diminished by the installation of an on-site vector variometer. In this case the spatial difference can be computed for night-time period, when the external field is less varying (both spatially and temporally) than during daytime. Installation of the on-site variometer in the field requires the fulfillment of nearly the same conditions as in the observatories, i.e. the control of the reference frame, the scale factors, the offsets, and the temperature effects of the magnetometer. The principle of the fluxgate and DIDD magnetometers is quite different from each other, therefore the two devices provide different possibilities to obtain accurate result. The paper discusses some of the possible instrumental errors and offers a method based on the DIDD technology for the determination of the reference frame of a portable recording station. We analyse real records measured during the joint Hungarian-Croatian repeat station survey.
8 citations
Journal Article•
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TL;DR: In this article, the authors present a method for calculating the vertical velocity of a fixed-geometry sailplane flying through air which has a constant vertical velocity over part of the flight path and is at rest elsewhere.
Abstract: If a cross-country fllght is carried out in conditions which permit it to be made without circling, the criterion in which must be applied in order to achieve maximun average speed ls similar to the MacCready criterion for determlning optimun speed between thernals in a normal cross-country flight. However, the datum vertical velocity (denoted by w* in the analysis, and corresponding to the datum setting of a MacCready variometer ring) is determined by the overall distribution of vertical air veloclty along the flight path together with some overall condltion such as zero change of energy helght between the beglnnlng and the end of the flight. In practice, a pilot would have to proceed by a process of successive approximation. Some calculatlons have been made for fixed-geometry sailplanes flying through air which has a constant vertical velocity over part of the fllght path and is at rest elsewhere.
6 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 2 |
| 2018 | 1 |
| 2017 | 4 |
| 2016 | 1 |
| 2015 | 1 |
| 2014 | 2 |