Shimadzu Corporation

Shinya Wakuda

Takeshi Maji

Daijiro Kato

A beam splitter assembly includes a beam splitter, a holder that holds the beam splitter, and a first spacer group arranged between the beam splitter and the holder. The first spacer group includes three first spacer pieces. Each of the three first spacer pieces includes a first optical element holder and a first positioning portion. The holder includes three first spacer piece acceptance recesses. Each of the first spacer piece acceptance recesses is in a shape corresponding to the first positioning portion. The three first spacer pieces are accommodated in the three first spacer piece acceptance recesses, respectively. The first optical element holder of each of the three first spacer pieces abuts on the beam splitter.

Beam splitter assembly and analyzer including the same

In an FTIR, a beam splitter, fixed mirrorand movable mirrorare shared by a main interferometerincluding a multiwavelength infrared light sourceand a control interferometerincluding a semiconductor laser. A first detectordetects infrared interference light generated by the main interferometerand transmitted through or reflected by a sample. A second detectordetects monochromatic interference light generated by the control interferometer. A spectrum creatordetermines an optical path difference between an optical path via the fixed mirrorand an optical path via the movable mirror, based on the intensity and uncalibrated oscillation wavelength of the monochromatic interference light detected by the second detector, and creates a spectrum by performing fast Fourier transform on an interferogram which shows a distribution of the intensity of the infrared interference light detected by the first detectorwith respect to the optical path difference. An oscillation wavelength calibratorlocates an absorption peak of carbon dioxide from the peaks in the spectrum created by the spectrum creator, and compares a wavenumber or wavelength of the absorption peak with a true absorption wavenumber or wavelength of carbon dioxide to determine a calibrated oscillation wavelength of the semiconductor laser

Fourier transform infrared spectrometer

An infrared spectrophotometer uses a configuration that allows notification of the appropriate replacement time for an electric heater. The infrared spectrophotometer is provided with an electric heater, a PWM control circuit, a state detection unit, and a notification processing unit. The electric heateris a light source that irradiates infrared radiation. The PWM control circuitcarries out PWM control so that the current supplied to the electric heateris constant. The state detection unitdetects the state of the electric heateron the basis of the variation in the duty cycle during PWM control. The notification processing unitreports the result of the detection by the state detection unit

Infrared spectrophotometer

The Fourier transform infrared spectrophotometer includes: a light sourcefor generating infrared light having a wavelength width including an absorption wavelength of a compound to be analyzed; an interferometer including a fixed mirrorand a movable mirror, for generating interfering light from the infrared light; a detectorfor generating a voltage with a magnitude corresponding to the intensity of the interfering light, and for outputting a voltage obtained by subtracting, from the aforementioned voltage, a voltage with a predetermined magnitude; a high-pass filterfor allowing the passage of frequency components equal to or higher than a predetermined frequency in an output voltage from the detector; an amplifierfor amplifying an output voltage from the high-pass filterby a predetermined multiplying factor; and an analogue-to-digital converterfor converting an output voltage from the amplifierinto a digital signal.

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Kyoto, Japan

Shinya Wakuda