SU911434A2 - Device for remote watching of objects - Google Patents

Description

(5) DEVICE FOR REMOTE MONITORING OR.ECTS.

I

The invention relates to the field of technical physics and can be used in the study of materials and the observation of objects located in powerful fields of ionizing radiation.

According to the main author. St. ff 297938 a device for remote observation of objects is known, which contains a television lens, a television camera and an optical fiber light guide interposed between them, an optical optical fiber is placed inside the helix of the electric heater. At a certain temperature, depending on the power of the ionizing radiation field, the integral coefficient of light transmission of a fiber-optic light guide can be stabilized at the required level due to thermal destruction of the centers of radiation staining in the optical materials used

in the manufacture of fiber optic light guides tt.

The lack of known design

device for remote observation of objects is that the electric heater coil does not allow for a uniform temperature distribution both along the length and in the cross section of the fiber optic light guide, since

Claims (2)

10, the temperature required for an acceptable coefficient of light transmission in the center of the fiber optic fiber, due to its low thermal conductivity across its cross section from the surface to the center, necessitates the creation of much higher temperatures on the surface of the fiber optic fiber, which is necessary. In the case of high power ionizing radiation fields, the temperature on the surface of the fibers is. the optical fiber may appear higher than, for example, the tem perature of the glass that the fiber optic fiber is made of. Smaller coefficient of optical transmission in the center of the fiber-optic fiber compared with its surface. plots will always reduce the total transmittance over the fiber-optic fiber cross section. Uneven, over the cross section of the fiber-optic fiber, the temperature leads to an uneven distribution of the spectral coefficient of light transmission over the cross-section of the fiber-optic fiber, which distorts the image of the observed objects; This, in turn, makes it difficult to use the device for remote monitoring. The purpose of the invention is to improve the quality of the transmitted image and increase the life of the device in high-power radiation fields due to uniform heating of the fiber-optic light guide, which ensures an even distribution of the transmittance over its cross section. The goal is achieved by the fact that Ne The surface of each fiber of an optical fiber light guide coated a coating of semiconductor material that is technologically compatible with the fiber material. . Such a constructive solution ensures uniform heating of the fiber-optic fiber and, consequently, uniform radiation staining in the field of ionizing radiation. The drawing shows a device for remotely observing objects in high-power fields of ionizing radiation. The device contains a television lens 1, which serves to form an image in the plane of the input end of the fiber-optic light guide. 2. From the output end of the fiber image of the object using the lens 3 is projected onto the photocathode of the television transmission tube C. As one of the shells of glass fibers constituting the fiber-optic fiber, a coating is applied, which is also applied to the ends of the fiber-optical fiber. Serving as electrical contacts 4 cycles between the coating of the fibers and an external electrical circuit connected to the current source 5. The transmitting electron-beam tube t, the objective 3, the current source 5 is located outside the field of ionizing radiation behind the biological shielding 6. The fiber with a coated coating is placed inside the helix of the electric heater. The device operates as follows. Using lens 1, an image of the object under study is projected onto the input end of the fiber-optic fiber 2. The fiber optic light guide transmits it to the output end, from which an image is projected onto the photocathode of a television cathode ray tube using lens 3 to register it. Under the action of ionizing radiation, radiation staining centers appear in a fiber-optic fiber, the amount of which depends both on the material of the fiber-optic fiber and on the power of the field of ionizing radiation. The formation of radiation staining centers leads to a decrease in the light transmission of the fiber-optic light guide. By regulating the current in the electrical circuit in which the coatings are included, for example, from SuClii, fiberglass fibers of the optical fiber, as well as in the spiral circuit of the electric heater, the thermal mode of the optical fiber light guide is selected, with which thermal destruction of the coloring centers will compensate for their formation. In this case, the heating of the fiber-optic fiber over its cross section will be practically gradient-free. The proposed remote monitoring device, in comparison with the known one, contains a more efficient system for stabilizing the light transmission of a fiber-optic fiber in the fields of ionizing radiation, which ensures its uniform thermal heating and allows obtaining an image of the object under study with less distortion, and also allows using the device remote observation in powerful fields of ionizing radiation 5 without a significant deterioration in the quality of the transmitted image for a period of personal time. . Increasing the time of operation of the remote device, monitoring without dismantling it allows to reduce operating costs, as well as to increase the safety of the staff. Reducing the optical distortion of the transmitted image allows the use of the proposed device to perform work that is difficult or impossible to perform using known remote monitoring systems. b 6 Claims of invention Device for remote monitoring of objects by author. se . No. 297938, characterized in that, in order to improve the quality of the transmitted image and increase the life time in high-power fields of ionizing radiation, a coating of semiconductor material technologically compatible with the fiber material is applied to the surface of each fiber of the fiber-optic light guide. - Sources of information taken into account during the examination 1. USSR author's certificate No. 297938, cl. & 02 B 23/12, 1969, 5