First observations and the test results shown in the previous section demonstrate that TESOS is a versatile device which meets most of its design goals. The main characteristics of TESOS are summarized in Table 4. There are still a few improvements to be made that we hope to implement in the near future. One drawback is the frame rate of 1-2 Hz, caused by the integration and readout time. The integration time can be reduced at the cost of decreased SNR, readout and storage rates are properties of the presently installed hard- and software. All mirrors within TESOS (and of the correlation tracker) are presently being coated with silver, which will increase the total transmission (telescope + correlation tracker + spectrometer) by about a factor of two and thus reduce the necessary integration time for a given signal-to-noise ratio. Other modifications include the installation of faster storage devices and some improvements of the camera software. The upgrade to a triple etalon system remains a long-term goal.
© European Southern Observatory (ESO) 1998
Online publication: November 9, 1998