| ??? 08/31/06 12:00 Read: times Msg Score: +1 +1 Informative |
#123428 - Anything else ?? Responding to: ???'s previous message |
Joseph Hebert said:
My first guess would have been "Low Voltage Dsomething Tsomething."
So how do Linear Variable Displacemtent Transformers work? Does a movable ferrous core slide in and out of a fixed transformer, or does a movable secondary slide in and out of a fixed primary? And if it's the latter case, how do they keep it linear with the fringe field effect? Finally, what do you use them for? Obviously they'd make good position sensors for feedback control, but do you use them for anything else? The LVDT is physically a cylinder with a hole up the centre. The cylinder contains three coils, a primary, wrapped around the whole in the centre, and a secondary at each end of that. A movable core slides inside the hole, coupling the primary and secondary. They keep it linear by the travel being a small fraction of the length or by very clever winding techniques which compensate the variation. Use is by sinusoidal constant level excitaion of the primary and synchronous demodulation of the outputs of the secondaries, followed (usually) by rectification. They are THE most exquisitely sensitive transducers and have theoretically infinite resolution. They are also tough as old nails and work will in hirad environements and worse. They have been used in force transducers, pressure sensors, torque sensors and the like. Steve |
| Topic | Author | Date |
| LVDT | 01/01/70 00:00 | |
| Google said....... | 01/01/70 00:00 | |
| What is a LVDT? | 01/01/70 00:00 | |
| LVDT | 01/01/70 00:00 | |
| That's not what I'd have guessed. | 01/01/70 00:00 | |
| That's the risk in guessing ... | 01/01/70 00:00 | |
| Anything else ?? | 01/01/70 00:00 | |
| there are also RVDT's | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| Linear Variable Displacement Transformer (LVDT) | 01/01/70 00:00 | |
Also... | 01/01/70 00:00 |