The deflection characteristics of a metal diaphragm pressure device can be somewhat improved by ----

The deflection characteristics of a metal diaphragm pressure device can be somewhat improved by corrugating the surface. This process involves creating a series of folds or ridges on the diaphragm, which increases its flexibility and responsiveness to changes in pressure. The corrugations allow for more controlled movement and improved sensitivity to minor pressure changes, which enhances the accuracy and performance of the device.

In contrast, smoothing the surface might improve wear or reduce friction, but it does not significantly impact deflection characteristics. Thickening the material could potentially make the diaphragm stiffer, which would be counterproductive for sensitive measurements. Changing the material can affect various properties, such as strength and durability, but does not inherently improve the deflection characteristics unless the new material is specifically designed to enhance those qualities. Thus, corrugating the surface is the most effective method for improving deflection in metal diaphragm pressure devices.