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參數(shù)資料
| 型號： | EVAL-AD5934EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 250 kSPS, 12-Bit Impedance Converter, Network Analyzer |
| 中文描述： | 250 kSPS的，12位阻抗轉(zhuǎn)換器，網(wǎng)絡(luò)分析儀 |
| 文件頁數(shù)： | 27/32頁 |
| 文件大小： | 335K |
| 代理商： | EVAL-AD5934EB |
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AD5934
ELECTRO-IMPEDANCE SPECTROSCOPY
The AD5934 has found use in the area of corrosion monitoring.
Corrosion in a metal such as aluminum, which is used in air
craft and ships, requires continuous assessment because the
metal is exposed to a wide variety of conditions such as temper-
ature and moisture. The AD5934 offers an accurate and
compact solution for this type of measurement compared to the
large and expensive existing units on the market.
Rev. 0 | Page 27 of 32
Mathematically the corrosion of a metal is modeled using a
RC network which consists of a resistance,Rs, in series with a
parallel resistor and capacitor, Rp and Cp. A system metal
would typically have values as follows: Rs 10 Ω to 10 kΩ,
Rp 1 kΩ to 1 MΩ, and Cp 5 μf to 70 μf.
The frequency range of interest when monitoring corrosion is
0.1 Hz to 100 kHz.
To ensure that the measurement itself does not introduce a
corrosive effect, the metal needs to be excited with minimal
voltage, typically in the 200 mV region which the AD5934 is
capable of outputting. A nearby processor or control unit
like the ADuc702x would log a single impedance sweep from
0.1 kHz to 100 kHz every 10 minutes and download the results
back to a control unit. In order to achieve system accuracy
from the 0.1 kHz to 1 kHz region, the system clock needs to be
scaled down from the 16.776 MHz nominal clock frequency to
500 kHz, typically. The clock scaling can be achieved digitally
using an external direct digital synthesizer like the AD9834
as a programmable divider, which supplies a clock signal to
MCLK and which can be controlled digitally by the nearby
microprocessor.
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