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We present the most recent technical improvements on SpIOMM, an ImagingFourier Transform Spectrometer (IFTS) attached to the 1.6 telescope of the MontM\'egantic Observatory. The recent development of SpIOMM demonstrates that theconcept of IFTS for ground telescopes is a promising astronomical 3Dspectroscopy technique for multi-object spectroscopy and multi-band imaging.SpIOMM has been developed through a collaboration between Universit\'e Lavaland the industry (ABB Bomem). It is designed for optical observations from thenear UV (350 nm) to the near IR (850 nm) with variable spectral resolution. Thecircular FOV of the instrument covers 12 arcmin in diameter. We have recentlyimproved the servo system algorithm which now controls the mirror displacementand alignment at a rate of ~7000Hz. Hardware improvements to the servo and themetrology system will be described along with their impacts on performance inthe laboratory and in observing conditions. The instrument has successfullybeen operated at the 1.6 meter telescope this year using the revised controlsystems and acquired several datacubes. We will discuss some issues regardingthe sensitivity to environmental conditions implied by the use of such aninstrument. An overview of the datacube reduction procedure will show somesolutions proposed for observational problems encountered that affect thequality of the data such as sky transmission variations, wind, changing gravityvector and temperature.

Technical improvements and performances of SpIOMM: an imaging Fourier transform spectrometer for astronomy