IMPACT MODULATOR, IMPACT MODULATOR AMPLIFIERS WITH FEEDBACK, AND SYSTEMS APPLICATIONS.
Abstract
The primary objective of this work is to develop and test pure fluid (pneumatic) circuits that perform as operational amplifiers and integrators. The active fluid component is the transverse impact modulator. The basic circuit diagram for the operational amplifier is essentially the same as an electronic operational amplifier. The difference being that the pneumatic DC amplifier has a low input impedance which has to be considered in the analysis. Necessary precautions are taken to eliminate the effects of the active elements from closed loop gain, especially at the higher gains. Design curves are presented that allow the closed loop gain to be predicted by the ratio of the summing resistors. Two operational amplifiers in series are used to attain a positive gain package which is used to form a bootstrap integrator. This type of integrator does not require the use of a blocking capacitor, but operates on the principle of critical positive feedback to compensate for the error found in RC filters. When properly adjusted this device performs a true integration. Time did not permit extensive testing of this device, but the results that were obtained were extremely satisfactory. The governing equations are presented which describe the resistance values necessary to obtain desired integration rates. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1964
- Accession Number
- AD0631561