Hadamard Spectrometry for Thermoluminescence Investigations

A Hadamard encoded spectrometer with a special variable interference filter allows attaining high throughput and sensitivity. In our instrument the interference filter is fixed between condenser lenses. The transmitted wavelength changes continuously along the length of the filter. The multislit cyclic Hadamard mask moves step by step behind the filter to multiplex signal. Some details concerning the data recording, handling and decoding are specific for this technique of investigation of thermoluminescence spectrum.