Abstract: This gas analysis device comprises: a laser light source which irradiates a gas to be measured with laser light; a laser control means which controls the laser light source so that the wavelength of the laser light is changed in each prescribed wavelength band; a light detection means which photoelectrically converts the laser light that have passed through the gas to be measured and outputs an electrical signal; and an interpretation means which analyzes, on the basis of the electrical signal, an absorption wavelength of the gas to be measured. In the gas analysis device, the laser control means controls the laser light source so that the intensity of the laser light changes into a shape (for example, a rectangular shape or a trapezoidal shape) having at least a substantially constant flat part in a prescribed time period, and the wavelength of the laser light changes in the time period.

Abstract: A gas analyzing apparatus includes first and second laser sources that output first and second laser lights, a laser controller that controls the first and second laser sources to vary wavelengths of the first and second laser lights in the respective predetermined wavelength ranges, an optical multiplexer that multiplexes the first and second laser lights to transmit the multiplexed laser light to a target gas, an optical receiver that receives the laser light transmitted through the target gas, and an analyzer that analyzes a temperature and/or a concentration of the target gas based on an electric signal output from the optical receiver. While varying the wavelengths of the laser lights, the laser controller controls amplitudes of the first and second laser lights to differ from each other and varies intensities of the first and second laser lights in the opposite direction.

Abstract: A gas analyzing apparatus includes first and second laser sources (11, 12) that output first and second laser lights, a laser controller (14) that controls the first and second laser sources to vary wavelengths of the first and second laser lights in the respective predetermined wavelength ranges, an optical multiplexer (15, 17) that multiplexes the first and second laser lights to transmit the multiplexed laser light to a target gas, an optical receiver (19) that receives the laser light transmitted through the target gas, and an analyzer (23) that analyzes a temperature and/or a concentration of the target gas based on an electric signal output from the optical receiver. While varying the wavelengths of the laser lights, the laser controller (14) controls amplitudes of the first and second laser lights to differ from each other and varies intensities of the first and second laser lights in the opposite direction.