FLUID RESPONSIVE HARNESS RELEASE TRIGGER CIRCUIT

摘要

An electro-optic detector utilizes a trigger circuit to sense the presence of a fluid medium and produce a control signal at a predetermined time after the fluid medium is detected. The trigger circuit responds to the presence of a fluid medium and provides a signal to control a device external to the circuit. The circuit includes means for producing a first signal when the fluid medium is detected and means responsive to the first signal for producing a control signal. In one embodiment of the invention, the first signal producing means includes a light source positioned at one end of a light path, a light responsive means positioned at the opposite end of the light path and a hollow prism intermediate the light path. When the prism is immersed in water, light from the light source is transmitted to the light responsive means which produces the first signal. The control signal producing means includes a first time delay network which closes a first gate circuit a predetermined time after the occurrence of the first signal and a second time delay network which closes a second gate circuit a predetermined time after the operation of the first gate circuit. Closing the second gate circuit produces the control signal which is utilized in an external device. One such external device is an automatic harness release.