What is the principle of a pyroelectric sensor?
* Question
| What is the principle of a pyroelectric sensor? |
* Answer
| The principle is that spontaneous polarization is generated because the crystal structure does not coincide with the center of gravity of the positive and negative charges in some directions.The direction of the spontaneous polarization vector points from the center of gravity of the negative charge to the center of gravity of the positive charge. When the temperature changes, it causes the relative displacement of the center of gravity of the positive and negative charges in the crystal structure, causing the spontaneous polarization to change. |
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