A popular material in metal strain gauge manufacture is a copper−nickel−manganese alloy, which is known by the trade name of "Advance." Semiconductor types have piezoresistive elements, which are considered in greater detail in the next section. Compared with metal gauges, semiconductor types have a much superior gauge factor (up to 100 times better) but are more expensive. Also, while metal gauges have an almost zero temperature coefficient, semiconductor types have a relatively high temperature coefficient.
In use, strain gauges are bonded to the object whose displacement is to be measured. The process of bonding presents a certain amount of difficulty, particularly for semiconductor types. The resistance of the gauge is usually measured by a d.c. bridge circuit, and the displacement is inferred from the bridge output measured. The maximum current that can be allowed to flow in a strain gauge is in the region of 5 to 50 mA depending on the type. Thus, the maximum voltage that can be applied is limited and, consequently, as the resistance change in a strain gauge is typically small, the bridge output voltage is also small and amplification has to be carried out. This adds to the cost of using strain gauges.
Top 10 richest Malaysians in 2014: Malaysia now boasts a total of eighteen billionaires, up from fourteen a year ago! Let's now take a look at the ten of the richest locals in 2014. As many Malaysians are well aware of, our country is going through a period of lows; our currency, the Ringgit, is weakening, we are experiencing a slowing economy and a lackluster stock market. All these come together to affect those who are earning a regular salary. But all of it is probably nothing more than an extra shrug from the guys on this list – if at all. In fact, some of those on the Forbes’ Malaysia’s Richest Tycoon list (ie the richest Malaysians, as of March 2014) have seen their fortunes increase as well, due to shrewd business decisions (amongst other things) despite economic conditions. Malaysia now boasts a total of eighteen billionaires, up from fourteen a year ago! Let’s now take a look at the ten of the richest locals in 2014. Source: Forbes’ Malaysia’s 50 Richest List Number 10: ...
Comments