什麼是IEPE,它和壓電集成電路(ICP)是一樣的嗎?

IEPE是指一種自帶電量放大器或電壓放大器的加速度傳感器。 IEPE是壓電集成電路的縮寫。因為由加速度傳感器產生的電量是很小的,因此傳感器產生的電信號很容易受到噪聲干擾,需要用靈敏的電子器件對其進行放大和信號調理。 IEPE中集成了靈敏的電子器件使其盡量靠近傳感器以保證更好的抗噪聲性並更容易封裝。 

IEPE加速度傳感器帶有一個放大器和一個恆流源。電流源將電流引入加速度傳感器。加速度傳感器內部的電路使它對外表現的像一個電阻。傳感器的加速度和它對外表現出的電阻成正比。因此傳感器返回的信號電壓和加速度也成正比。放大器允許你設置輸入範圍以充分利用輸入信號。

目前市場上提供IEPE技術的有幾個公認的品牌。儘管其他公司也生產IEPE加速度傳感器,但這並不表明他們的產品兼容那些聲稱兼容壓電集成電路的設備。各公司之間的一個重要區別是激勵傳感器所需的電流不同。一般情況下這些傳感器所需的電流是4mA,使用前確認設備提供的驅動電流是很必要的。壓電集成電路(ICP)已經被註冊為公司商標(PCB Piezotronics Inc),特指他們生產的IEPE產品。他們的網站上提供了很多很好的有關壓電式傳感器的知識。



相關鏈接: 
  1. PCB Piezotronics: TechSupport Page
  2. KnowledgeBase 2P3FKC2P: What Type of Accelerometers Are Used With The SCC-ACC01 Signal Conditioning Module? 

<span =“apple-style-span” style="font-family: sans-serif; line-height: 19px; "><h1 id=“firsting” =“firsting” style="color: black; background-image: none; background-attachment: initial; background-origin: initial; background-clip: initial; : initial; font-weight: normal; margin-top: 0px; margin-right: 0px; margin-bottom: 0.1em; margin-left: 0px; padding-top: 0.5em; padding-bottom: 0px; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(170, 170, 170); font-size: 24px; line-height: 1.2em; background-: initial initial; background-repeat: initial initial; ">Integrated electronic piezoelectric accelerometer

From Wikipedia, the free encyclopedia

Integrated electronic piezoelectric (IEPE) accelerometers are a class of accelerometers that incorporate an electronic amplifier and use a single two-pole coaxial connector for both power input and signal output.<sup id=“cite_ref-0” =“reference” style="line-height: 1em; font-weight: normal; font-style: normal; ">[1] The devices are also known by proprietary names such as Integrated Circuit Piezoelectric (ICP). <sup id=“cite_ref-1” =“reference” style="line-height: 1em; font-weight: normal; font-style: normal; ">[2] Compared with earlier sensor interface systems requiring a charge-sensitive preamplifier external to the sensor, the use of a single coaxial connector with integrated electronics gives IEPE devices their main advantages: small size, light weight, robustness and low cabling costs. Microphones and other vibration sensors are also made using an IEPE-compatible interface.

<span =“editsection” style="float: right; margin-left: 5px; font-size: 13px; ">[edit]<span =“mw-line” id=“electrical_characteristics”>Electrical characteristics

The IEPE interface is defined in the IEEE 1451.4 standard<sup id=“cite_ref-2” =“reference” style="line-height: 1em; font-weight: normal; font-style: normal; ">[3] which also includes the definition for the Transducer Electronic Data Sheet (TEDS), data from which is carried on the same interface. Some IEPE sensors are made without TEDS, using only the powering interface defined by IEEE 1451.4. Different manufacturers’ implementations vary, so the manufacturer’s data sheet must be consulted for each device.<sup id=“cite_ref-3” =“reference” style="line-height: 1em; font-weight: normal; font-style: normal; ">[4]

Power is supplied to the inner conductor of the coaxial cable from an external constant-current supply of 0.5 to 8 mA. The power supply can be built in to the receiving instrument such as anoscilloscope or data acquisition device, or may be a separate unit.

The output signal from the device is also on the inner conductor, and consists of an AC voltage <sup id=“cite_ref-4” =“reference” style="line-height: 1em; font-weight: normal; font-style: normal; ">[5] centred on a bias voltage of about 8 to 12 V.<sup id=“cite_ref-mmf_5-0” =“reference” style="line-height: 1em; font-weight: normal; font-style: normal; ">[6] The output voltage is bounded at the lower end by the saturation voltage of the integrated IEPE amplifier (typically 0.5 to 2 volts), and at the upper end by the maximum compliance voltage of the current source (which may be anything between about 6 and 30 volts).

The shield of the cable serves as the ground return for the supply current and also protects the inner conductor from electromagnetic interference.

This method of combining the power and signal on a single pair of conductors is a form of simplex powering, sometimes referred to as phantom although it is not compatible with the phantom powering system used in audio equipment. The receiving instrument uses a simple RC filter to separate the output signal of the IEPE device from the supply current. This means that the DCcomponent of the signal is lost, and so when a static acceleration needs to be measured, a “zero Hz” accelerometer must be used instead.

<span =“editsection” style="float: right; margin-left: 5px; font-size: 13px; ">[edit]<span =“mw-line” id=“references”>References

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  • ^ Jon S. Wilson, Sensor technology handbook, Newnes, ISBN 0750677295, 2004, p.289
  • ^ Neil J. Mansfield, Human response to vibration, 1st edn., CRC Press, 2004, ISBN 041528239X, p.106
  • ^ http://standards.ieee.org/regauth/1451/index.html
  • ^ Practical considerations in using IEPE accelerometers with modern data acquisition systems, Meggitt/Endevco 2009, accessed 2009-05-18
  • ^ “What is the output of an IEPE accelerometer?”, Honeywell Test & Measurement, accessed 2009-04-14
  • ^ “IEPE Standard”, Metra Mess- und Frequenztechnik in Radebeul e.K., accessed 2009-05-18
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