34 results about "Differential optical absorption spectroscopy" patented technology

The invention discloses a reconstruction method for atmosphere trace gas spatial distribution by differential optical absorption spectroscopy tomoscan, which is characterized in that two differential absorption scan optics remote measurement assemblies arranged at two sides of air mass to be measured according to an initial observation angle are performed with simultaneous and timing intersect scanning, an intersect sector light beam geometric optical path is constructed, measurement is carried out according to measurement interval which is determined by sampling rate and ray quantity together, a processor can accurately acquire the characteristic differential absorption spectroscopy of atmosphere trace gas at ultraviolet and visible wave band according to measured spectroscopy data, line integral concentration of the trace gas along the whole optical path is parsed from total atmosphere delustring information; under a sector light beam ray geometric structure, accurate inverting line integral concentration is taken as projection vector, an atmosphere trace quantity component spatial distribution reconstruction algorithm is employed, and a visual two dimensional or three dimensional atmosphere trace gas spatial distribution graph is finally formed. According to the invention, the visual atmosphere trace gas spatial distribution integral information graph can continuously and accurately provide the multi-component atmosphere environment pollution gas at real-time online.

The invention discloses an introduction optical system of a differential absorption spectrometer, which is characterized in that a telescope is arranged, and an optical filter and a lens group are sequentially arranged on the follow-up optical path of the telescope, and the light emitted from the lens group is imaged on the incident slit of the differential absorption spectrometer above; the filter is a 490nm-700nm visible light filter or a 287nm-490nm ultraviolet filter; the lens group is composed of three positive lenses and two negative lenses intersecting, The incident light in the direction of the ground enters the telescope and is guided into the lens group through the filter sheet. The invention adopts the transmission method to separately receive and image the ultraviolet waveband and the visible light waveband, thereby effectively reducing the aberration and improving the measurement accuracy.

The invention provides an optical fiber transceiver integrated air differential optical absorption spectroscopy (DOAS) measuring system, which solves the problems of low spectrum utilization ratio and difficulty in instrument adjustment and optical path centering of the existing typical DOAS system. The measuring system comprises a point light source, a telescope, a spectrograph and an optical fiber bundle with a transceiver integrated structure, wherein, the optical fiber bundle with the transceiver integrated structure is composed of transmitting optical fiber and receiving optical fiber and provided with an optical fiber transceiver common port. The spectrum sent by the point light source is transmitted through the optical fiber transceiver common port from one end of the transmitting optical fiber, aligned through a spherical reflector in the telescope, reflected along the original direction after reaching a pyramid prism, focused through the spherical reflector and then enters the optical fiber transceiver common port, and finally transmitted through the other end of the receiving optical fiber and then led into the spectrograph for spectrum detection. Compared with the typical DOAS system, the measuring system reduces two plane reflectors, avoids a light beam being sheltered by the plane reflector during the transmission process, improves the spectrum utilization ratio and simplifies the instrument adjusting and centering process.

The present invention relates to a high sensitivity optical system of a differential optical absorption spectroscopy (DOAS) analyzer for gas concentration detection. According to the system, two optical axes of a collimating lens set and a condenser lens set intersect on a side of a large lens to form the optical axis intersection point, wherein the collimating lens set is arranged perpendicular to the condenser lens set; optical axes on both sides of the collimating lens set are respectively provided with a light source and a transmitted light reflector; optical axes of both sides of the condenser lens set are respectively provided with an optical fiber spectrometer and a reference light reflector; a spectroscope plated with a reflecting film is positioned on an angular bisector of a right angle, wherein the optical axes of the two adjacent sides of the collimating lens set and the condenser lens set intersect to form the right angle; the spectroscope is concurrently and obliquely arranged on the optical path comprising the half outgoing beam of the collimating lens set and the half incoming beam of the condenser lens set in the angle of 45 DEG, and the other half outgoing beam of the collimating lens set and the other half incoming beam of the condenser lens are provided with moveable baffles, wherein the positions of the movable baffles are switchable; the half of the beam emitted by the light source enters the reference light path, and the other half of the beam enters the measurement light path. According to the present invention, under the same light source radiationconditions, the light energy passing through the optical system of the present invention is strong, the signal-to-noise ratio is high, and the measurement precision is improved.