Device for measuring the concentration of atmospheric ozone

 

(57) Abstract:

Use: to measure the concentration of atmospheric ozone in the atmosphere by optical methods. The inventive device has a third photodetector with optical filter, and the second and third photodetectors, as well as the corresponding filters are made in the form of rings. The diameter of the outer ring is determined based on the length of the tube. 2 Il.

The invention relates to meteorology, namely physics and chemistry of the atmosphere, and is intended for the determination of ozone in the atmosphere by optical methods.

Analogues device for measuring the concentration of atmospheric ozone are optical ozonesonde [1], is based on measuring the intensity of ultraviolet solar radiation absorbed by ozone, by passing it through the atmosphere to the devices located on the radiosondes raised with the help of balloons. Optical ozonesonde contain light emitting ultraviolet part of solar spectrum radiation in the absorption band of ozone and outside stripes. The photometer consists of svetorasseivateley, set filters and photodetectors.

The lack of analog and include reduced accuracy measuring range is AK and ambient air and aerosol radiation. In addition, the analogs used a mechanical change of filters, which complicates and increases the cost of construction of the optical Ozonesondes, reduces the reliability of the measurements.

The prototype of the invention is an optical ozonometer [2] containing tube, filters and photodetectors, and one of them is located at the base of the tube. The presence of the tube from the prototype allows to exclude either direct or diffuse solar radiation by moving the tube on the Zenith or the sun. For guidance of the tube at the Zenith of the sky or the sun, as well as changing filters required mechanical components and elements.

The objective of the invention is the elimination of mechanical components and elements and thus simplifying the design, cost reduction, and improved reliability of the measurements.

The task is solved in that the device for measuring the concentration of atmospheric ozone containing tube, filters and two of the photodetector, and one of them of the same diameter as the tube, and is located in the base of the tube, equipped with a third photodetector, while the second and third photodetectors made annular and arranged concentrically in the same plane with the first photodetector aimed foster powis difference of the squares of the radii of the large third external sensor and radius round of the photodetector more cotangent angular height of the sun during the measurement. One ring of sensors equipped with filters having a bandwidth within the band of radiation absorption by ozone, and the other out of band.

In Fig. 1 shows a device for measuring the concentration of atmospheric ozone, General view; Fig.2 shows the geometry of the device.

The device comprises a tube 1, a photodetector 2, 3, 4 color-filter 5. Tube 1 (Fig. 1) is directed vertically upward and is perpendicular to the plane of the photodetectors 2-4. The sun rays are inclined at an angle of elevation of the sun. From geometry (Fig.2) and the conditions so that the shadow of the tube was blocked photodetectors 2-4, followed by the specified ratio:

> ctg

> ctg where Z is the length of the tube;

d - diameter of the tube;

D - outer diameter of a large photodetector;

angular height of the sun.

An example of a specific implementation of the device may be the following: the length of the tube 5 cm, the diameter of the tube is 1 cm, the diameter of the sensors 1, 2, 3 cm, filters brand LGL, UVC ultraviolet radiation. The tube inside blacked out. As photodetectors used semiconductor puck is performed on the surface of the grooves separating the receiving surface of the photodetectors to the upper pawna photodetectors incident solar radiation. Because the above-mentioned geometrical ratio, the shadow of the tube permanently occlude the internal photodetector 2 and part of the external photodetectors 3 and 4. Thus, the receiver 2 receives only diffuse radiation on the outer 3 and 4 diffuse and direct sun radiation.

Subtracting from the signal from the photodetectors 3 and 4, the signal of the photodetector 2, receive only part of the signal from direct radiation. Having two signals from direct radiation to the photodetector 3 and 4 with filter and without filter, calculate the concentration of ozone in the air column.

When lifting device for measuring the concentration of atmospheric ozone using radiosonde is possible to determine the concentration of ozone in the air depending on height measurements.

DEVICE FOR measuring the CONCENTRATION of ATMOSPHERIC OZONE containing tube with a round sensor in the base of the tube of the same diameter, the second photodetector and the light filters in the absorption band and out-band absorption of ultraviolet radiation by ozone, characterized in that it is provided with a third photodetector, while the second and third photodetectors made annular and arranged concentrically in the same plane with the first payroll is equipped with a filter, with a bandwidth in the band of the absorption of ultraviolet radiation by ozone, and the other outside the absorption band.

 

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