| 摘要 |
<p>A device for indicating the magnitude of a physical parameter, such as pressure, temperature or flow rate, has a movable pointer (1), a receiving antenna (4b, 4c) and a transmitting antenna (4a). The transmitting antenna (4a) generates an electromagnetic field in the vicinity of the pointer (1), so that an electrical signal is induced in the receiving antenna (4b, 4c). An inductive component (3) in the form of an electrically resonant circuit is connected to the pointer (1). Movement of the inductive component (3) in the electromagnetic field generated by the transmitting antenna 4a affects the electrical signal induced in the receiving antenna (4b, 4c) such that the signal induced in the receiving antenna (4b, 4c) is indicative of the displacement of the pointer. The device has the advantage that a simple mechanical indicator can be configured to produce an electrical reading by applying a simple passive inductive component to the pointer (3).</p> |
