| 摘要 |
Minute movement of a bellows from a quiescent position as a result of pressure in the bellows is detected by a photodetector and light source to generate a signal constituting a function of the position of the bellows. This signal is amplified and fed back to a coil with a cooperative magnetic core to generate electromagnetically a force opposing the movement of the bellows. The greater the movement, the greater is the opposing force so that the bellows reaches an equilibrium position very close to its quiescent position. By then measuring the value of the signal, an extremely accurate measurement of the opposing force and thus the balancing pressure in the bellows is attained.
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