什麼是IEPE，它和壓電積體電路(ICP)一樣嗎?

admin

什麼是IEPE，它和壓電積體電路(ICP)一樣嗎?


硬體: Multifunction DAQ (MIO)

問題: 什麼是IEPE，它和壓電積體電路(ICP)一樣嗎?

解答: IEPE是一種內建電量或電壓放大器的加速規。IEPE是壓電積體電路的縮寫。因為由加速規所產生的電量是很微弱的，因此此種感應器所產生的訊號很容易受到訊號干擾，所以需要用較靈敏的電路來放大以及處理這訊號。IEPE中便整合了這些靈敏電路並讓它儘可能地靠近感應器以保證更好的抗雜訊能力和更容易封裝。

IEPE加速規是由一個放大器和一個電流源所組成。電流源將電流送入加速規。位在加速規內部的電路表現在外的行為等同一個電阻。而加速規所感應到的加速度則和它所表現出的電阻成正比。因此，感應器所回傳的訊號電壓值也和加速度成正比。此外，放大器則允許你設置輸入範圍以充份利用輸入訊號。

目前市場上提供IEPE技術的有幾個公認的品牌。儘管其它公司也生產IEPE的加速規，但並不保證它們的產品相容於那些聲稱相容壓電積體電路(ICP)的設備。各公司的一個重要區別是送入感應器的電流大小不一致。一般情況下，加速規需要的電流是4mA，但是還是請在使用前確認設備所提供的驅動電流規格。

壓電積體電路(ICP)已經被PCB Piezotronics公司註冊，因此特別指他們所生產的IEPE產品。他們的網站上提供了對於壓電式加速規很好的介紹，底下有他們公司的相關連結。

相關連結:

External Link : PCB Piezotronics Introduction to Piezoelectric Accelerometers

KnowledgeBase 2P3FKC2P: What Type of Accelerometers Are Used With The SCC-ACC01 Signal Conditioning Module?

KnowledgeBase 4WDE2H7E: Why Do Some IEPE Sensors Specify “Excitation Voltage”?

附加檔案:


IEPE and Integrated Circuit Piezoelectric (ICP®) ExplainedPublish Date: 二月 08, 2018 | 2 评级 | 4.00 out of 5 | [url=]Print[/url]
OverviewThis article explains what IEPE means and whether it the same as Integrated Circuit Piezoelectric (ICP®).
Table of Contents

• Introduction
• Additional Information
• Additional Resources
  

1. Introduction

IEPE refers to a type of transducer that is packaged with a built-in charge amplifier or voltage amplifier. IEPE is an initialism for Integrated Electronic Piezoelectric.

Integrated Circuit-Piezoelectric, or ICP®, is a trademark of PCB Piezotronics, Inc., and refers specifically to the IEPE devices that they manufacture. Their website contains a good introduction to piezoelectric accelerometers that can be found in theAdditional Resources section.

IEPE technology is marketed under several recognizable brand names. Although other companies make IEPE based transducers, this does not imply that they are compatible with equipment that claims ICP® compatibility. One of the key variations from company to company is the amount of current necessary to power the sensor. Generally these sensors require a 4 mA current excitation, but be sure to verify this with the specific device being used.

Back to Top

2. Additional Information

Because the charge produced by an IEPE transducer is very small, the electrical signal produced by the transducer is susceptible to noise and sensitive electronics must be used to amplify and condition the signal. IEPE makes the logical step of integrating the sensitive electronics as close as possible to the transducer to ensure better noise immunity and more convenient packaging.

IEPE transducers consist of an instrumentation amplifier and a constant current source. The current source pumps current into the transducer. The circuitry inside of the transducer makes it behave like a resistor. The amount of physical phenomena (i.e. acceleration) the transducer is experiencing creates a proportional amount of resistance. Therefore, the returning signal is a voltage proportional to the phenomena. The amplifier allows you to set the input range to take maximum advantage of the incoming signal.

Back to Top

3. Additional Resources

• External link: Introduction to ICP® Accelerometers
• Excitation & Compliance Voltage Specifications for IEPE Sensors
  

Back to Top