Abssac produces atherm bellows assembly
An
Abssac product story
Edited by the Engineeringtalk editorial team
Dec 2, 2008
An atherm temperature-sensitive bellows assembly has been manufactured and supplied by Abssac as part of its controlled electroform component programme.
These lightweight, sensitive assemblies are thin-walled, electrodeposited nickel bellows soldered to custom end pieces filled with a working fluid (with a known coefficient of thermal expansion) and then sealed.
The assemblies are thin-walled, electrodeposited nickel bellows soldered to custom end pieces filled with a working fluid and then sealed.
By sealing a specific volume of fluid within a electrodeposited nickel bellows, the volumetric thermal expansion characteristic of the fluid is transformed into a precise, measurable linear movement.
This movement can be used as an actuator, or calibrated to be read as control data, and is completely reversible due to the extremely low hysteresis of the bellows material.
The atherm is currently being used in one defence application to compensate for the thermal growth of components within precision targeting devices.
The response of the bellows ensures that the targeting image is not distorted by environmental changes in temperature from sub-zero to extreme desert heat conditions.
These athermalisation bellows assemblies are designed, manufactured and assembled to the customers exacting specifications.
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