Combined MASS-DIMM instrument for atmospheric turbulence studies

TL;DR

This paper describes the design, operation, and calibration of the combined MASS-DIMM instrument used for monitoring atmospheric optical turbulence at observatories, emphasizing data quality and potential applications.

Contribution

It provides a detailed overview of the MASS-DIMM instrument's components, calibration procedures, and operational considerations for atmospheric turbulence studies.

Findings

Ensures accurate measurement of atmospheric turbulence parameters.

Provides calibration procedures for reliable data collection.

Demonstrates applications in site testing and observatory monitoring.

Abstract

Several site-testing programs and observatories currently use combined MASS-DIMM instruments for monitoring parameters of optical turbulence. The instrument is described here. After a short recall of the measured quantities and operational principles, the optics and electronics of MASS-DIMM, interfacing to telescopes and detectors, and operation are covered in some detail. Particular attention is given to the correct measurement and control of instrumental parameters to ensure valid and well-calibrated data, to the data quality and filtering. Examples of MASS-DIMM data are given, followed by the list of present and future applications.