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參數(shù)資料
| 型號(hào)： | LTS15D10C-01 |
| 元件分類(lèi)： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, XSS |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 0K |
| 代理商： | LTS15D10C-01 |
(5/8)
002-01 / 20070227 / eb461_ts.fm
All specifications are subject to change without notice.
PIEZO-TYPE LEVEL SENSORS
BASIC PRINCIPLES OF OPERATION
The basic structure and principles of operation of a piezoelectric
vibration type sensor are the same as those of a piezoelectric
sounder.
The most generally used vibrator "unimorph" structure comprises
a thin piezoelectric disk, which has electrodes formed on both sur-
faces, attached to a thin metal diaphragm (Fig.1).
The piezoelectric ceramic undergoes polarization treatment in the
direction perpendicular to the disk surface. As shown in Fig. 2,
when an external voltage is applied, the disk expands and con-
tracts in the direction of the polarization as well as in a perpendicu-
lar direction relative to the direction of polarization. In the unimorph
structure, a metal diaphragm that does not expand-contract when
an electric field is applied is attached to one side of the disk.
Therefore this metal diaphragm is flexed by expansion-contraction
of the piezoelectric ceramic as shown in Fig.3. The unimorph
structure vibrates due to repeated flexure when an AC signal is
used as the applied voltage.
Fig.2: Movement of the
Fig.3: Flexing vibration
piezoelectric element
Since the sensing diaphragm surface will be exposed to powder
and must be wiped periodically, the piezoelectric vibration sensor
must be constructed in such a way that the surface of the sensing
diaphragm is flat and is located at the very front of the sensor.
In order to fulfill these conditions, the bond between the unimorph
structure and the case is located at the diaphragm perimeter, not
at the unimorph edge. The diaphragm perimeter is connected to
the case (diaphragm perimeter mounting in Fig.4).
Since sensor detection characteristics are greatly affected by
changes in the diaphragm perimeter support, various methods are
required to avoid this source of variance. These methods include
use of elastic silicone to attach the diaphragm, use of a fixed
attachment area / thickness, etc. (Fig.5)
Metal diaphragm
(Vibrator)
Piezoelectric
disk
Electrode
Fig.1: Structure of 3-terminal piezoelectric unimorph vibrator
( polarization direction)
(a) Unimorph edge support
(b) Diaphragm perimeter support
(c) Diaphragm perimeter mounting
Fig.4.Unimorph mounting/support methods
9mm
Piezoelectric element
Electronic component
Case
(Zn die cast)
Silicon
11mm
Diaphragm(Phospher bronze)
Board for control circuit
Fig.5: Structure of piezoelectric vibrator type sensor
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