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The personal error in absolute geomagnetic measurements |
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He,Y.(1),Zhao,X.(1),Zhang,S.(1) |
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(1)Institute of Geophysics, China Earthquake Administration |
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The fluxgate theodolite is an instrument which was made up of two parts, fluxgate sensor and theodolite. And the fluxgate sensor is mounted on top of the telescope of the theodolite. It was used to measure the magnetic declination D and inclination I in absolute geomagnetic measurements. There are many errors in the measurement, for example, Index error, horizontal-axis error, collimation error, personal error and so on. Some of them can be eliminated by choosing specific measurement procedure. So they have no impact on the measurement results. However, the personal error is difficult to eliminate. Because it may arise from the observer’s minimum resolution in physiology or reading error, it may come from the observer’s observation method or skill and so on. As modern fluxgate has a high precision, usually with 1 second of arc, the personal error effect on the observation result has become a factor that cannot be ignored. In order to estimate personal error, an experiment has been done. Several observers who were proficient in observation were invited to finish this measurement experiments. The fluxgate theodolite was fixed on the observation pillar, and the observers took turns to observe it. Finally, the personal error can be estimated by comparing the observation results. |
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Measurements |
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poster |
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