Claims
- 1. In a compound accelerometer the improvement comprising:
- a first and second simple accelerometer units, each simple accelerometer unit including
- a. a hollow conductive open-ended case;
- b. piezo-electric transducers sealing each end of said case to form a chamber, said piezo-electric transducers being oppositely polarized, one of said piezo-electric transducers being electrically dominant;
- c. a sufficient volume of a conductive heavy liquid nearly filling said chamber; and
- means for securing together said first and second simple accelerometer units, said first and second simple accelerometer units being matched as to residual voltage with the electrically dominant piezo-electric transducers of the simple accelerometer units facing in opposite directions.
- 2. The compond accelerometer as defined by claim 1 wherein:
- the volume of said conductive heavy liquid in each simple accelerometer unit is sufficient to render the voltage sensitivity of each said simple accelerometer unit to equal a desired level when said simple accelerometer units are excited under prescribed conditions of acceleration and frequency.
- 3. The compound accelerometer as defined by claim 2, wherein the piezo-electric transducers of each said simple accelerometer unit are matched as to capacitance within a desired tolerance.
Parent Case Info
This is a division of application Ser. No. 562,920, filed 12/19/83, now U.S. Pat. No. 4,505,014 issued Mar. 19, 1985.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
562920 |
Dec 1983 |
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