Pyroelectric infrared radiation detector
AssigneeSamsung Electronics Co., Ltd.
InventorsTae-ho Kim, Sung-soo Lee
Life of this patent
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Abstract
A pyroelectric infrared radiation detector is capable of removing internal noise generated in a pyroelectric element as well as noise due to a power source in the manner that the induction noise of exterior high-frequency noise due to an inductance component in an outer lead wire is removed by connecting a second filter to a drain electrode of a FET, and the high-frequency interior noise is removed by installing a first filter between the pyroelectric element and FET. Therefore, a body sensing signal can be obtained by using only one pyroelectric element.
Claims4
A pyroelectric infrared radiation detector having a pyroelectric element, means for amplifying a signal detected in said pyroelectric element, and a bias resistor for providing the detected signal as a bias voltage to said amplifying means, comprising:
- a first filter installed between said pyroelectric element and said bias resistor for blocking internal noise in said pyroelectric element by passing only a body sensing signal;
- and
- a second filter installed between said amplifying means and a power source for removing external noise induced by an outer lead wire.
Dependencies are inferred from the claim text.