THE INFLUENCE OF TEMPERATURE AND PRESSURE ON PERFORMNCE OF OPTICAL SURVEYING INSTRUMENTS
Vladimir PaĊĦagic, Tijana Parlic Risovic
Abstract:
Althought the surveying instruments grow ever more complex, yet the telescope remains the basic part of modern-day surveying instruments. When considering the problem of measuring with a surveying instrument, that is with the telescope, it is necessary to consider the issue as a whole. In other words it is necessary, alongside the function of the telescope, to take into consideration the object to be measured, atmosphere as the medium transmitting light and physiological and psychological attributes of the sighter. In order to define a complex optical system that would facilitate prediction of measurement's accuracy with the telescope, in dependence on atmosphere conditions, namely different temperature and preassure, it is necessery to provide a description of the atmosphere and telescope as independet optical systems. This is accomplished throught modulation transfer function that provides a complete description of the properties of a considered optical system. Starting with the fact that surveyors prior to their departure to outdoor measurings have at their disposal only the information on air temperature and pressure, we have conducted suitable theoretical study of the problem. The results of this study provide means to evaluate the limitations of resolution of a considered optical system imposed by the atmospher based on the knowledge of available meteorological parameters.
Keywords:
telescope resolution, limitation, atmosphere
Download:
PWC-2003-TC2-010.pdf
DOI:
-
Event details
Event name:
XVII IMEKO World Congress
Title:

Metrology in the 3rd Millennium

Place:
Dubrovnik, CROATIA
Time:
22 June 2003 - 28 June 2003
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