SOV - BI-8 (infraprůkazníkový dalekohled)

BI-8 / БИ-8
The Infrared Binoculars BI-8 (БИ-8) is designed to detect infrared flares used in active infrared instruments. An indicator plate included in the optics is used as an infrared indicator. Infrared rays from the radiation source pass through the objective lens of the telescope and strike the indicator plate, where they form a bright circular spot of green color (the shade is determined by the chemical composition of the sensitive layer).


In order for the indicator plate to be functional, it must be excited from the UV source before use (there is a spinner on the left eyepiece that moves the plate from the working position to a position under the UV filter to excite it). Either normal daylight can be used as the UV source (diffused light will ensure the plate is excited within 15-20 minutes, direct sunlight within 10-15 minutes), or a 100-200 W incandescent bulb will ensure the plate is excited in 15-20 minutes if the bulb is about 20 cm from the filter. When energizing, care must be taken to ensure that the UV filter surface is illuminated (the eyepiece must not cast a shadow on the filter) and also to avoid excessive heating of the telescope body (by the bulb, direct sunlight) and the resulting leakage of the sealing compound, which ensures the tightness of the telescope.



One charge of the plate is sufficient for 2-3 days of use (if the instrument is used for an average of 8 hours / 24 hours), or up to 5-7 days if the binoculars are stored in the case. It is recommended not to use the instrument for at least 1-2 hours after the end of the excitation, as the freshly excited plate shows a weak luminescence, which makes observation difficult.


The binoculars include colour filters to protect the eyes against glare and to increase the contrast of the image, especially when observing against the sun, during light fog or haze, or when observing very distant targets.


Optical characteristics of the BI-8:
- Magnification: 8x
- field of view: 8°30' without indicator plate, 7° with indicator plate in working position
- exit pupil diameter: 3,8 mm
- exit pupil distance: 10.8 mm
- resolution 7" without indicator plate, 15" with indicator plate in working position
- diopter adjustment: +/- 5 for the right eyepiece and +5/-3 for the left eyepiece.


Source.
URL : https://www.valka.cz/SOV-BI-8-infraprukaznikovy-dalekohled-t184068#537506 Version : 0
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