This paper presents a new grating configuration that combines the benefits of multi-angle interrogation with the phase-polarisation contrast method. The setup is based on the gold grating of a commercially available recordable compact disk, which allows the excitation of surface plasmons. The compact disks are mass produced by injection-moulding, which results in low cost disposable grating substrates. The measurement method allows high resolution analysis of gases and surface chemistry. Results for this system have been demonstrated using helium, air and carbon dioxide gases.