| 摘要 |
PURPOSE:To prevent thermally adverse effects on a device in a cryostat by using only a light guide and an optical fiber transmission line to a connecting part between the inside and outside of the cryostat when a repeater is set in the cryostat. CONSTITUTION:An output signal of sensors 4-6 in the cryostat 1 is led exter nally via the repeater 11. In this case, a control terminal 22 of an electrooptic signal converter 14 is connected to signal leads 23-25 provided airtightly through a wall of a thermal insulation package 12 and an output terminal of a stabilizing circuit 27 of a photoelectric motive force device 15 is connected to a power lead 28 provided airtightly through the wall of the thermal insulation package 12. Further, one end of the light guide 29 made of an optical fiber and one end of an optical fiber transmission line 30 are inserted through the wall of the package 12 airtightly. Thus, the elements connecting the inside and outside of the cryostat 1 are the light guide 29 and the optical fiber trans mission line 30 with bad heat conduction. |
