RF detector and temperature sensor
First Claim
1. An RF electromagnetic radiation detector comprising:
- a device having a first terminal and a second terminal with a PN junction therebetween, with the first terminal connected to the P side of the PN junction and the second terminal connected to the N side of the PN junction, with the device susceptible to a voltage being built across the PN junction in the presence of RF electromagnetic radiation;
means for connecting a first voltage to the first terminal and a second voltage to the second terminal; and
means for measuring the current from the second terminal, wherein the current measured is indicative of the presence of RF electromagnetic radiation.
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Accused Products
Abstract
An RF electromagnetic radiation detector has a device that has a first terminal and a second terminal with a PN junction therebetween. The first terminal is connected to the P side of the PN junction and the second terminal is connected to the N side of the PN junction, with the device susceptible to a voltage being built across the PN junction in the presence of RF electromagnetic radiation. The detector is first reverse biased by connecting a first voltage to the first terminal and a second voltage, higher than the first voltage to the second terminal. Current is then measured from the second terminal, where the current measured is indicative of the presence of RF electromagnetic radiation. A temperature sensor has a load, that has a first terminal and a second terminal with the first terminal connectable to a first voltage. A capacitor has a third terminal and a fourth terminal with the third terminal connected to the second terminal and the fourth terminal connectable to a second voltage. The first terminal is connected to the first voltage and the fourth terminal is connected to the second voltage. Finally the first voltage is disconnected from the first terminal and the second voltage from the fourth terminal, and the voltage at the third terminal is measured. The voltage measured at the third terminal or the amount of time required for the voltage at the third terminal to reach a threshold voltage, is dependent upon the ambient temperature.
15 Citations
16 Claims
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1. An RF electromagnetic radiation detector comprising:
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a device having a first terminal and a second terminal with a PN junction therebetween, with the first terminal connected to the P side of the PN junction and the second terminal connected to the N side of the PN junction, with the device susceptible to a voltage being built across the PN junction in the presence of RF electromagnetic radiation; means for connecting a first voltage to the first terminal and a second voltage to the second terminal; and means for measuring the current from the second terminal, wherein the current measured is indicative of the presence of RF electromagnetic radiation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting RF electromagnetic radiation in an intrusion detection device having a first terminal and a second terminal with a PN junction therebetween, with the first terminal connected to the P side of the PN junction and the second terminal connected to the N side of the PN junction, with the device susceptible to a voltage being built across the PN junction in the presence of RF electromagnetic radiation;
- wherein said methods comprising;
reverse biasing the device by connecting a first voltage to the first terminal and a second voltage, higher than the first voltage to the second terminal; and measuring the current from the second terminal, wherein the current measured is indicative of the presence of RF electromagnetic radiation. - View Dependent Claims (8, 9)
- wherein said methods comprising;
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10. A temperature sensor comprising:
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a load, having a first terminal and a second terminal with the first terminal connectable to a first voltage; a capacitor having a third terminal and a fourth terminal with the third terminal connected to the second terminal and the fourth terminal connectable to a second voltage; means for connecting the third terminal to the second voltage, and means for disconnecting said second voltage from the third terminal and for measuring the voltage at the third terminal; wherein the time for the voltage measured at the third terminal to reach a target value is dependent upon the ambient temperature.
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11. A passive intrusion detection device comprising:
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an infrared intrusion sensor having a sensitivity dependent upon the ambient temperature; a load, having a first terminal and a second terminal with the first terminal connectable to a first voltage; a capacitor having a third terminal and a fourth terminal with the third terminal connected to the second terminal and the fourth terminal connectable to a second voltage; means for connecting the third terminal to the second voltage, and means for disconnecting said second voltage from the third terminal and for measuring the voltage at the third terminal; and means for adjusting the sensitivity of the infrared intrusion sensor in response to the voltage measured.
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12. A method of measuring ambient temperature with a load, having a first terminal and a second terminal with the first terminal connectable to a first voltage, a capacitor having a third terminal and a fourth terminal with the third terminal connected to the second terminal and the fourth terminal connectable to a second voltage;
- wherein said method comprising;
connecting the first terminal to the first voltage and the fourth terminal to the second voltage, connecting the third terminal to the second voltage; disconnecting said second voltage from the third terminal; and measuring the voltage at the third terminal; wherein the time required for the voltage measured at the third terminal to reach a target value is indicative of the ambient temperature. - View Dependent Claims (13)
- wherein said method comprising;
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14. A method of operating a passive intrusion detection device having an infrared intrusion sensor having a sensitivity dependent upon the ambient temperature;
- a load, having a first terminal and a second terminal with the first terminal connectable to a first voltage; and
a capacitor having a third terminal and a fourth terminal with the third terminal connected to the second terminal and the fourth terminal connectable to a second voltage;
wherein said method comprising;connecting the first terminal to the first voltage and the fourth terminal to the second voltage, connecting the third terminal to the second voltage; disconnecting said second voltage from the third terminal; measuring the voltage at the third terminal; and adjusting the sensitivity of the infrared intrusion sensor in response to the time required for the voltage measured at the third terminal to reach a target value.
- a load, having a first terminal and a second terminal with the first terminal connectable to a first voltage; and
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15. A method of measuring ambient temperature with a load, having a first terminal and a second terminal, a capacitor having a third terminal and a fourth terminal with the third terminal connected to the second terminal;
- wherein said method comprising;
connecting the first terminal to a first voltage, briefly connecting the third terminal to a second voltage; and measuring the voltage at the third terminal; wherein the time required for the voltage measured at the third terminal to reach a target value is indicative of the ambient temperature.
- wherein said method comprising;
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16. A method of operating a passive intrusion detection device having an infrared intrusion sensor having a sensitivity dependent upon the ambient temperature;
- a load, having a first terminal and a second terminal; and
a capacitor having a third terminal and a fourth terminal with the third terminal connected to the second terminal;
wherein said method comprising;connecting the first terminal to a first voltage, briefly connecting the third terminal to a second voltage; measuring the voltage at the third terminal; and adjusting the sensitivity of the infrared intrusion sensor in response to the time required for the voltage measured at the third terminal to reach a target value.
- a load, having a first terminal and a second terminal; and
Specification