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Hybrid saw/baw sensor

A technology of converters and nodes, which is applied in the direction of instruments, scientific instruments, and the use of sound waves/ultrasonic waves/infrasonic waves to analyze fluids, etc., and can solve problems such as the inability to use sensors advantageously

Inactive Publication Date: 2008-11-05
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The sensor cannot be used advantageously unless an interrogation circuit is used

Method used

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  • Hybrid saw/baw sensor
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  • Hybrid saw/baw sensor

Examples

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Embodiment Construction

[0025] The specific values ​​and configurations discussed in these non-limiting examples may be varied and are cited merely to describe at least one embodiment, and are not intended to limit the scope thereof.

[0026] figure 1 A SAW / BAW hybrid sensor according to an aspect of an embodiment is shown. The SAW device 101 has an input transducer 102 and an output transducer 103 mounted on a substrate 108 . The input converter 102 has a first input node 104 and a second input node 105 via which electrical signals can be transmitted into and out of the input converter 102 . The output converter 103 has a first output node 106 and a second output node 107 . The BAW sensor 108 has a first electrode 110 and a second electrode 111 mounted on a substrate 109 . The first output node 106 is electrically connected to the first electrode 110 . The second output node 107 is electrically connected to the second electrode.

[0027] figure 2 An interrogation circuit electrically connect...

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Abstract

A SAW / BAW hybrid sensor is a sensor that combines the ease of interfacing with a higher frequency of SAW device and the response, precision, ease of use with liquid applications and dynamic range of a BAW sensor. The SAW device can condition an interrogation signal before passing it to the BAW sensor. For example, the SAW device can act as an impedance matcher or a frequency shifter. The hybrid sensor can be created by connecting the electrodes of a BAW sensor to a SAW device transducer. The hybrid sensor can be interrogated via any of the common interrogation circuits such as a grid dip oscillator or a RADAR type interrogation system.

Description

technical field [0001] Embodiments of the present invention relate to the field of sensing circuits. Embodiments also relate to surface acoustic wave devices and bulk acoustic wave sensors. Embodiments additionally also relate to the use of bulk acoustic wave sensors as loads for surface acoustic wave devices. Background technique [0002] Acoustic devices often have one or two transducers disposed on a piezoelectric substrate. A transducer can transform an electrical input signal into an acoustic signal. The acoustic wave device can then alter the acoustic signal as it travels through or along the substrate. Transducers can also convert acoustic signals into electrical signals. One common use of acoustic wave devices is in conditioning or filtering signals, such as filtering electrical signals received by cellular telephones, since acoustic wave devices can be reasonably good and inexpensive signal filters. [0003] Acoustic devices are also used as sensors. Piezoelec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/02
CPCG01N29/022G01N2291/0256G01N2291/0423G01N29/036G01N29/2462
Inventor J·ZT·刘
Owner HONEYWELL INT INC