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Wireless sensor reader

A wireless sensor and reader technology, used in sensors, inertial sensors, instruments, etc., can solve problems such as limited battery life, large power, and large additional circuits

Inactive Publication Date: 2012-04-18
ENDOTRONIX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The additional circuitry required for the frequency sweep method and / or the digital tracking method is significant, increasing reader size, cost and failure rate
Additionally, the amount of power required to transmit, signal process, sample, and track the sensor's resonant frequency using a digitally controlled frequency tracking or sweeping system is enormous and limits the ability to use battery power in the reader and limits the Battery Life in Battery-Powered Readers

Method used

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Examples

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Embodiment Construction

[0033] A passive wireless sensor system is provided wherein the passive wireless sensor system includes a reader 10 in remote communication with a sensor 12 . Reader 10 is capable of energizing sensor 12 by sending a signal, such as a radio frequency ("RF") pulse, at a frequency equal to or close to the resonant frequency of sensor 12 (see figure 1 ). The sensor 12 may emit a ringing signal for a short period of time in response to an excitation pulse from the reader 10 .

[0034] The sensor 12 may be a passive device that itself contains no power source and is capable of emitting a ringing signal 16 in response to an excitation signal 14 at or near the resonant frequency of the sensor 12 . Sensor 12 may be configured to sense a particular parameter. For example, sensor 12 may include a fixed inductor 13 and a capacitor 15 that varies based on a sensed parameter. Changing capacitance or inductance causes the resonant frequency of sensor 12 to change. However, it should be ...

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PUM

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Abstract

A wireless sensor reader is provided to interface with a wireless sensor. The wireless sensor reader transmits a narrowband, fixed frequency excitation pulse to cause the wireless sensor to generate a ring signal. The ring signal corresponds to the value of the physical parameter being sensed. The wireless sensor reader receives and amplifies the ring signal and sends the signal to a phase-locked loop. A voltage- controlled oscillator in the phase-locked loop locks onto the ring signal frequency and generates a count signal at a frequency related to the ring signal frequency. The voltage-controlled oscillator is placed into a hold mode where the control voltage is maintained constant to allow the count signal frequency to be determined. The low power, simple circuitry required to generate the excitation pulse allows the reader to be a small, battery operated unit. Alternative methods of frequency determination are also disclosed.

Description

[0001] Cross References to Related Applications [0002] This nonprovisional application is a continuation-in-part of U.S. Patent Application 12 / 419,326, filed April 7, 2009, which is a continuation-in-part of U.S. Patent Application 12 / 075,858, filed March 14, 2008 , which US Patent Application 12 / 075,858 claims priority to US Provisional Application 60 / 918,164, filed March 15, 2007, the entire contents of each application being incorporated herein by reference. technical field [0003] The present invention relates generally to reading passive wireless sensors, and more particularly to reader circuits and methods for stimulating and sensing data from passive wireless readers. Background technique [0004] Passive wireless sensor systems using resonant circuit technology are known. These systems utilize passive wireless sensors to communicate remotely with actuator and reader circuits. The wireless sensor is often implanted at a specific location, such as within the human...

Claims

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Application Information

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IPC IPC(8): G08B1/08
CPCA61B2562/0219A61B5/0215A61B5/0031A61B5/6882A61B5/7225G08C17/02
Inventor H·罗兰德R·沃特金斯B·桑德拉姆B·保罗S·I·安M·纳吉
Owner ENDOTRONIX
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