RU217466U1 - Device for ultraviolet irradiation - Google Patents

Abstract

The proposed utility model relates to sources of ultraviolet radiation intended for the implementation of photochemical and photobiological processes, and can be used to disinfect surfaces, treat skin diseases and carry out photochemical reactions, in particular, heterophase reactions at the interface of the liquid and gas phases. The technical result is to increase the stability of irradiation of the surface of various objects. The device for ultraviolet irradiation contains an excilamp 1, a switching power supply 2, a controller 4, a sensor 5, the applied sensor 5 is optical. The sensor 5 is located in the predetermined zone of exposure to the radiation of the excilamp on the irradiated object 6 and is electrically connected to the controller 4. The use of the proposed utility model allows you to stabilize the amount of energy illumination of ultraviolet radiation on the irradiated surface or an object located on the surface.

Description

The utility model relates to gas-discharge radiation sources, in particular to electrodeless excilamps, and can be used to carry out photochemical and photobiological processes that require ultraviolet radiation, incl. for ultraviolet disinfection and treatment of skin diseases.

Various irradiation installations are known, incl. ultraviolet, designed to receive and redistribute in space, time and spectrum of the radiation flux to ensure an appropriate response of radiation receivers [1]. Such installations contain a lamp, a power source (external or autonomous), and - if necessary - a housing, optical elements for redistributing radiation in space (mirrors, lenses, shutters, etc.) and control elements (switches, modulation circuits, etc.). P.).

Irradiation installations are known, in which electrodeless excilamps of barrier and capacitive discharges are used as a source of ultraviolet radiation [2-6]. The advantages of using these lamps are, in particular, the following:

Depending on the gas content of the excilamps, they provide a relatively narrow emission spectrum with a half-width from 2 to 15 nm for exciplex molecules and up to 30 nm for inert gas excimers. This, in turn, ensures the selectivity of various photochemical reactions and, accordingly, the wide applicability of such radiation sources in problems where narrowband is needed and radiation directivity and coherence are not needed;

excilamps have a different design, which allows them to be adapted to solve different problems;

when turned on, the excilamps reach the maximum energy luminosity in a fraction of a second;

The used excilamps, in contrast to the widely used mercury lamps, do not contain hazardous substances in the flask.

The closest in technical essence to the claimed radiation source is a device for the treatment of skin diseases [8]. It includes a XeCl excilamp, a switching power supply, an interface controller and is equipped with a distance sensor to automatically adjust the dose of ultraviolet radiation when the distance from the patient's skin changes. The device is designed to stabilize the energy illumination of the skin of patients during phototherapy.

The device has flaws. Firstly, the distance sensor used has an error, which is associated with differences in the skin of patients and the background on which the irradiated object is located. Secondly, due to the degradation of the working mixture and the excilamp shell material, its radiation intensity changes over time (it can increase or decrease), and the distance sensor does not correct these changes. And this, in turn, leads to the fact that in order to provide the desired dose of radiation, the device must be reconfigured, which can only be done by qualified personnel. In addition, the radiation intensity of excilamps depends on the mains voltage, which can also lead to a violation of the ultraviolet irradiation regime.

The technical result of the proposed utility model is to increase the stability of irradiation of the surface of various objects.

The technical result is achieved by the fact that in a device for ultraviolet surface irradiation, containing an excilamp, a switching power supply, a controller, a sensor, according to the utility model, the sensor is optical, located in a given area of exposure to excilamp radiation on an irradiated object, electrically connected to the controller, while the controller is configured to compare the signal from the sensor with the signal from the power source of the excilamp and to establish the necessary repetition rate of the radiation pulses to provide the surface with the energy illumination specified under the given conditions.

The proposed solution ensures the stabilization of energy illumination in various operating conditions, primarily due to the fact that the sensor is optical, which means that the response of the microcontroller does not depend on the properties of the irradiated object or medium. The sensor is located in a given area of exposure to the radiation of the excilamp on the irradiated object. It has a high spectral sensitivity in the excilamp ultraviolet range. The controller compares the signal from the sensor with the signal from the power source of the excilamp and sets the necessary repetition rate of the radiation pulses to provide the energy illumination of the object and environment specified under the given conditions. If the object moves away or approaches the excilamp, then the feedback loop "excilamp - sensor - microcontroller - power source" corrects the radiation pulse repetition rate to maintain the level of energy illumination. The same feedback works when the excilamp radiation intensity changes during its long-term operation due to the degradation of the working mixture and the shell material. Since the controller also fixes the current of the excilamp, it also ensures that the radiation intensity is corrected if the mains voltage of the device is fluctuating. Due to this, the energy illumination of ultraviolet radiation remains stable under various conditions - when the position of the irradiated object changes, during power surges, and during degradation of the excilamp. This, in turn, simplifies the operation of the device: there is no need to monitor these factors and reconfigure the power supply.

In FIG. 1 shows a block diagram of a device for ultraviolet irradiation, in Fig. 2 and 3 - examples of the operation of the device in the stabilization mode (1) and without it (2).

The device consists of an excilamp 1, a pulsed power supply 2, a mains voltage source 3, a controller 4 having direct and feedback connection with the pulsed power supply, an optical sensor 5 located in a predetermined zone of exposure to the excilamp 7 radiation on the irradiated object 6.

The device works as follows.

The excilamp 1 is ignited from a switching power supply 2, which converts the voltage from the network 3 into high-voltage pulses with a frequency from a few to hundreds of kilohertz. The excilamp radiation of a given intensity falls on an optical sensor 5 located in a given zone of the irradiated object 7 and is electrically connected to the controller 4. The signal from the sensor 5 is used by the controller 4 to correct the frequency of repetition of high-voltage voltage pulses of the power source 2. To do this, the controller 4 compares the signal from the sensor 5 with a signal from power supply 2, and also monitors the current consumed by the excilamp. As a result, the energy illumination of ultraviolet radiation remains stable when the position of the irradiated object changes, during power surges, and during degradation of the working mixture and the excilamp bulb (which reduces the intensity of its radiation). All this stabilizes the energy illumination of the excilamp radiation flux on the irradiated object.

Examples of the operation of the device are shown in Fig. 2 and 3. The XeCl excilamp with a maximum emission at a wavelength of 308 nm and a half-width of the emission band of 1.8 nm was taken as the radiation source. Sensor - ultraviolet photodiode GUVA-S12SD, sensitive to excilamp radiation. The Atmega8 microcontroller is matched via a CD4011 logic microcircuit with a high-voltage power supply for the excilamp, which ensures the repetition rate of high-voltage radiation pulses from 10 to 100 kHz. The power was measured with a Hamamatsu photodetector with an H8025-222 head sensitive to excilamp radiation.

In FIG. 2 and 3 - examples of the operation of the device in the stabilization mode (1) and without it (2).

In FIG. It can be seen from Fig. 2 that with the removal of the excilamp from the irradiated object in the stabilization mode, we obtain an almost linear dependence of the energy illumination on the distance. The calculated ripple factor in this case is 2.75%.

According to FIG. Figure 3 shows that when the mains voltage changes from 180 to 240 V, the device also ensures the stabilization of the energy illumination on the irradiated object located at a distance of 1.5 cm from the excilamp surface. The calculated ripple factor in this case is 1.3%. Similarly, during long-term operation and a decrease in the excilamp radiation intensity, its power supply will be corrected, which will also lead to stabilization of the energy illumination of the excilamp radiation on the irradiated object.

Thus, the proposed solution ensures the stability of irradiation of the surfaces of various objects.

Information sources

1. Reference book on lighting engineering / Ed. Yu.B. Eisenberg. 3rd ed. revised and additional - M.: Boos Lighting Group, 2008. - 952 p.

2. Sosnin E.A. Excilamps and a new family of gas-discharge ultraviolet irradiators based on them // Light engineering. - 2006. - No. 6. - S. 25-31.

3. Sosnin E.A., Tarasenko V.F. Excilamps - a promising tool for photonics // Photonics. - 2015. - No. 1. - S. 60-69.

4. Sosnin E.A., Skakun V.S., Panarin V.A., Pechenitsin D.S. Device for air disinfection // Patent RU 2746562 C1. - Application No. 2020123655. - Priority: 07/09/2020. - Published on 04/15/2021. - Bull. No. 11.

5. Sosnin E.A., Avdeev S.M., Skakun V.S., Panarin V.A., Pechenitsin D.S., Sorokin D.A. Radiation source // Useful model for patent RU 205117 U1. - Application No. 2020143326. - Priority: 12/25/2020. - Published on 06/28/2021. - Bull. No. 19.

6. Boychenko A.M., Lomaev M.I., Panchenko A.N., Sosnin E.A., Tarasenko V.F. Ultraviolet and vacuum-ultraviolet excilamps: physics, technique and applications. - Tomsk: STT, 2011. - 512 p. -ISBN 978-5-93629-433-4.

7. Avdeev S.M., Orlovsky V.M., Panarin V.A., Pechenitsin D.S., Skakun B.C., Sosnin E.A., Tarasenko V.F. Effective sources of UV and VUV radiation - excilamps and photoreactors based on them. Izvestiya vuzov. Physics. - 2017. - T. 60. - No. 8. - S. 31-35.

8. Schitz D.V., Bessonov V.A., Aniskevich V.M. Device for the treatment of skin diseases // Useful model for patent RU 160730 U1. - Application No. 2015135427/14, - Priority: 20.08.2015. - Published on 03/27/2016. - Bull. No. 9.

Claims (1)

A device for ultraviolet surface irradiation, containing an excilamp, a switching power supply, a controller, a sensor, characterized in that the sensor is optical, located in a given zone of exposure to the excilamp radiation on the irradiated object, electrically connected to the controller, while the controller is configured to compare the signal with a sensor with a signal from the power source of the excilamp and establishing the necessary repetition rate of radiation pulses to provide the surface with the energy illumination specified under the given conditions.

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