7 Conclusion

The main results of the paper are the following:

1. the Fouks-Schubert model allows us to describe the short term transient for LW-ISOCAM data for uniform illumination of the detector. The accuracy is better than 1% for more than 90$\%$ of the pixels;
2. From independent datasets, we have evidence of spatial variations in the maps of the two parameters of the model ($\beta$ and $\lambda$). No significant temporal variations of these parameters have been found during the ISO mission;
3. The FS model cannot be applied directly to describe the behavior of point source response and the long term drift;
4. Original and efficient inversion method has been proposed;
5. The theoretical model we use is only one special case of a large family of non linear models. Applications to other ISO detectors must be tested.

We can now correct data taken with the LW channel of ISOCAM with an accuracy of 1% for low contrasted fields.

Acknowledgements

We thank the different ISO teams at IAS, CEA-Saclay, ESA and IPAC for their outstanding work and continuous support during all phases of the ISO project. A. Coulais also would like to thank the CNES (France) for its financial support.