3. Instrument Modes and Astronomical Observation Templates

The three main PHT observing modes are photometry, spectrophotometry and polarimetry. In the photometric mode PHT offered a number of possibilities to observe point-like and extended sources, in staring or in chopped observing mode.

In the following sections these modes are described in detail. Chopping is regarded here as a general procedure applicable to several modes.

• Chopping
• Photometry - Single pointing multi-filter/multi-aperture
• Photometry - Multi-filter rastering
• Photometry - Absolute photometry
• Photometry - Oversampled Scans and Maps
• Photometry - Sparse maps
• Polarimetry
• Spectrophotometry

• 3.1 Chopping
• 3.2 Single-Pointing Multi-Filter and Multi-Aperture Modes
• 3.3 Raster Mode
• 3.4 Absolute Photometry
• 3.5 Oversampled Linear Scans and Maps
• 3.6 Sparse Maps
• 3.7 Spectrophotometry
• 3.8 Polarimetry
• 3.9 Serendipity Mode
• 3.10 ISOPHOT Modes of Operation
  • 3.10.1 PHT-P: PHT03, PHT04, PHT05, PHT17/18/19
  • 3.10.2 PHT-C: PHT22, PHT25, PHT32, PHT37/38/39
  • 3.10.3 PHT-S: PHT40
  • 3.10.4 Polarisation observations: PHT50, PHT51