Arrangement for controlling the coolant supply to a cooler for the detector of an optical seeker in a missle

A device for controlling the coolant supply from a reservoir to a cooler for a detector (24) of an optical seeker (14) in a missile, which is arranged in a launcher (12) attached to an aircraft, comprising

• coolant control means governing the coolant supply from said reservoir to said cooler, and
• caging means (54, 46) for caging the movable seeker optical system (18, 20) of the seeker (14), which are releasable for target tracking before the operation of the missile by a release signal through a control line extending from the cockpit (10) of the aircraft to the launcher (12), said control line having an aicraft end and a launcher end
• characterized in that
• (a) a bistable circuit (80) is provided on said missile end of said control line,
• (b) said coolant control means being controlled by said bistable circuit (80) to release or shut off the coolant supply depending setting or resetting of said bistable circuit (80),
• (c) the setting and resetting of the bistable circuit (80) being determined by a predetermined variation in time of said release signal.