Abstract: This far-infrared analyzing device comprises: a holding mechanism configured to be capable of holding specimen in moist air; a detector for detecting light obtained by emitting a far-infrared light beam onto the specimen; and a signal processing unit for computing an absorption spectrum of the specimen from a signal from the detector. The signal processing unit acquires: a first spectrum detected by the detector when the far-infrared light beam is emitted along measurement optical path while the wavelength of the far-infrared light beam is changed, without the specimen being on the measurement optical path; and a second spectrum detected by the detector when the far-infrared light beam is emitted along the measurement optical path while the wavelength of the far-infrared light beam is changed, with the specimen on the measurement optical path.

Abstract: This far-infrared spectroscopy device comprises a holding mechanism that is capable of holding a sample in humid air, a detector for detecting light obtained by emitting far infrared light onto the sample, and a signal processing unit for calculating an absorption spectrum of the sample from a signal from the detector. The signal processing unit comprises a threshold processing unit that subjects the signal from the detector to threshold processing and removes the part of the signal influenced by the absorption by the water vapor in the humid air, a signal interpolation unit that carries out interpolation on the signal that has been subjected to the removal by the threshold processing unit, and an absorbance calculation unit for calculating an absorbance from the signal that has been subjected to the interpolation by the signal interpolation unit.

Abstract: Provided are a far-infrared spectroscopy device and sample adapter that make it possible to highly accurately measure a sample that is not flat. A far-infrared spectroscopy device according to this invention comprises an illumination optical system for concentrating far-infrared light onto a sample and a detector for detecting light that has passed through the sample. Sample adapters are placed on the optical path of the far-infrared light between the illumination optical system and the sample and on the optical path between the sample and a detection optical element. The front surfaces of the sample adapters are roughly flat, and the shapes of the sample-side surfaces of the sample adapters roughly match the shape of the sample. The surface of the sample that the far-infrared light is concentrated on and the surface that the far-infrared light passes through are curved.

Abstract: This far-infrared spectroscopy device comprises a holding mechanism that is capable of holding a sample in humid air, a detector for detecting light obtained by emitting far infrared light onto the sample, and a signal processing unit for calculating an absorption spectrum of the sample from a signal from the detector. The signal processing unit comprises a threshold processing unit that subjects the signal from the detector to threshold processing and removes the part of the signal influenced by the absorption by the water vapor in the humid air, a signal interpolation unit that carries out interpolation on the signal that has been subjected to the removal by the threshold processing unit, and an absorbance calculation unit for calculating an absorbance from the signal that has been subjected to the interpolation by the signal interpolation unit.