POSITION INDICATING DEVICES
A position indicating device that meets the requirement of locating the position of a number in a sealed body by means of apparatus outside the body is described. The electrical position-indicating device relying on change of inductance effects employs a differentially wound double coil, which is movable to follow the movement of a number of magnetic material, such that with the member of magnetic material occupying one position in the circuit, a condition of electrical balance exists in a circuit including the coil. At other positions of the member of magnetic material a condition of electrical unbalance exists in the circuit and an output derived from the circuit is employed to energize means for moving the coil relative to the member of magnetic material to the position such that a condition of electrical balance is restored in the circuit characterized in that the differentially wound coil is included in a second circuit such that should the member of magnetic material move completely out of the coil leaving the first circuit in balance. a condition of epectrical unbalance exists in the second circuit. The instrument can be used for indicating the position of control rods in a reactor. (M.C.G.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-041234
- Assignee:
- United Kingdom Atomic Energy Authority
- Patent Number(s):
- US 3108213
- OSTI ID:
- 4631009
- Country of Publication:
- United States
- Language:
- English
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