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A Design Method of Delay Line-Based Surface Acoustic Wave Sensing Circuit System

A technology of delay line type and sensing circuit, which is applied to the analysis of fluids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and electrical components, etc., which can solve national economic and national property losses and system stability. Low power consumption, false positives of the sensor system, etc., to achieve low power consumption, increase stability and reliability, and filter out interference

Active Publication Date: 2022-07-15
XIAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the sensing system based on SAW technology puts forward more stringent requirements on its matching circuit with the improvement of the sensitivity of SAW sensor. However, the current sensing system based on SAW technology generally has problems such as low system stability and high power consumption. It is very easy to cause false alarms and malfunctions of the sensor system, which has caused major losses to the national economy and national property.

Method used

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  • A Design Method of Delay Line-Based Surface Acoustic Wave Sensing Circuit System
  • A Design Method of Delay Line-Based Surface Acoustic Wave Sensing Circuit System
  • A Design Method of Delay Line-Based Surface Acoustic Wave Sensing Circuit System

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Embodiment Construction

[0070] like Figure 1 to Figure 7 The shown method for designing a delay line-based surface acoustic wave sensing circuit system includes the following steps:

[0071] Step 1. Fabrication of a delay line type surface acoustic wave device without sensitive film:

[0072] Step 101: Select the piezoelectric thin film layer 1, and set the input interdigital transducer 2 and the output interdigital transducer 3 on the piezoelectric thin film layer 1, the input interdigital transducer 2 and the output interdigital transducer The structure of the device 3 is the same, and the input interdigital transducer 2 and the output interdigital transducer 3 are symmetrically arranged with respect to the center of the piezoelectric film layer 1, and both ends of the piezoelectric film layer 1 are coated with sound-absorbing glue 5;

[0073] Step 102 , encapsulate the delay line type surface acoustic wave device obtained in step 101 by using wire bonding equipment to obtain a delay line type s...

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Abstract

The invention discloses a method for designing a sensing circuit system based on a delay line type surface acoustic wave. The method includes the following steps: first, making a delay line type surface acoustic wave device without a sensitive film; second, making a delay line including a sensitive film Linear SAW gas sensor; 3. Select the appropriate parameters to form the reference oscillation generating circuit; 4. Select the appropriate parameters to form the oscillation generating circuit; 5. Select the appropriate parameters to form the oscillating signal mixing and processing circuit; Appropriate parameters of the circuit; 7. The connection of the reference oscillation generating circuit, the oscillation generating circuit, the oscillation signal mixing processing circuit and the low frequency signal conditioning circuit. The invention has a reasonable design, and the designed delay line-based surface acoustic wave sensing circuit system has low power consumption and generates a high-stability sensing signal.

Description

technical field [0001] The invention belongs to the technical field of sensor information collection, and in particular relates to a design method of a delay line-based surface acoustic wave sensing circuit system. Background technique [0002] In recent years, emerging information industries such as artificial intelligence and the Internet of Things have developed rapidly. In particular, cutting-edge core technologies such as 5G high-frequency mobile communications, Internet+, big data computing, and IoT perception have led the trend of science and technology. The development of many emerging information industries is inseparable from the support of sensor information collection technology. Surface acoustic wave sensing, or SAW sensor, has the advantages of high sensitivity, easy integration and wireless, which conforms to the future development trend of sensors, and is increasingly valued and favored by engineers in the sensor field. [0003] At present, the sensing syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/02H03H3/08
CPCG01N29/022H03H3/08G01N2291/021G01N2291/02809G01N2291/0423
Inventor 张涛朱寒苏晓敏姜峰师晓云曹晓闯柯贤桐
Owner XIAN UNIV OF SCI & TECH
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