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TELIS (TErahertz  and ,submm ,LImb  Sounder)  is  a ,three-channel  balloon-borne  heterodyne ,spectrometer ,for  atmospheric,research. The observational,techniques of TELIS can be compared,to the presently flying MLS instrument on board NASA’s EOS-Aura satellite, but TELIS is built with a new generation ofcryogenic heterodyne detectors and novel compact,systems,suitable for integration into the confined space of a balloon borne cryostat. TELIS will fly on the MIPAS-B2 gondola.  The  two  instruments  together  will  yield  the  most  complete  set  of  stratospheric  constituents,  measured so  far.  TELIS  is  a  cooperation  between  the  European  institutes  DLR  (PI-institute),  RAL  and  SRON.  First  flight foreseen in the spring of 2008 from Teresina, Brasil. The three TELIS receivers provide simultaneous,vertical profile measurement,of a range of molecules. The 500 GHz channel is  developed  by  RAL  and  will  produce  vertical  profiles  of  BrO,  ClO,  O3  and  N2O.  The  1.8  THz  channel  is  developed by DLR and will mainly target the OH radical, and will also measure HO2, HCl, NO, NO2, O3, H2O, O2and HOCl. Finally the 480 - 650 GHz channel is developed by SRON and IREE and will measure profiles of ClO, BrO, O3, HCl, HOCl, H2O and its 3 isotopomers, H2O2, NO, N2O, HNO3, CH3Cl and HCN. Inthis paper,  the  science  and  technology  of  TELIS  will  be  discussed  with  emphasis  on  the  channel  developed  by  SRON. It contains a Superconducting Integrated Receiver (SIR), which combines on a 4x4 mm,chip the low-noise SIS mixer and  its  quasioptical  antenna,  a  superconducting  phase-locked  Flux  Flow  Oscillator  (FFO)  acting  as  Local  Oscillator (LO) and a SIS harmonic,mixer (HM) for FFO phase locking. The latest results from the pre-flight test and integration campaigns,will be presented.  Key words: Atmospheric, limb-sounding, cryogenic, heterodyne, sub millimeter.

Balloon-borne heterodyne stratospheric limb sounder TELIS ready for flight