An icing sensor based on surface acoustic wave oscillator
A technology of icing sensors and surface acoustic wave devices, which is applied in the directions of sound wave reradiation, instruments, radio wave measurement systems, etc., can solve the problems of poor real-time performance, difficult implementation, low sensitivity, etc., and achieve easy implementation and good temperature stability , the effect of high detection sensitivity
Active Publication Date: 2022-07-12
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology
[0006] The purpose of the present invention is to solve the problems of low sensitivity, poor real-time performance and difficult implementation in the existing icing sensors. In order to achieve the above object, the present invention proposes a icing sensor based on surface acoustic waves. : including a surface acoustic wave device and an oscillating circuit (11), and also including a packaging tube shell (6) and a water-permeable membrane (7);
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[0054] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0055] like image 3 As shown, a surface acoustic wave-based icing sensor provided by an embodiment of the present invention includes: a piezoelectric substrate 1, an input transducer 3 and an output transducer 4 arranged on the piezoelectric substrate 1, and a Oscillation circuit 11 composed of shifter 8, amplifier 9, frequency collector 10, etc.
[0056] The surface acoustic wave-based icing sensor also includes a package tube 6, a water-permeable membrane 7 that is covered on the package tube 6 and communicated with the external environment, and an SiO layer covering the surface of the piezoelectric substrate 1 as an acoustic waveguide layer. 2 Thin layer 2. The water vapor passes through the permeable membrane 7 in the SiO 2 The surface of the protective thin layer 2 freezes, so that the surface acoustic wave device outputs an electrical...
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An icing sensor based on a surface acoustic wave oscillator, comprising a surface acoustic wave device and an oscillating circuit (11), further comprising an encapsulation tube shell (6) and a water-permeable membrane (7); the surface acoustic wave device adopts an encapsulation tube outside The shell (6) is encapsulated; the water permeable membrane (7) is arranged at the opening of the encapsulation tube shell (6); the surface of the surface acoustic wave oscillator is covered with SiO 2 A protective thin layer (2); the surface acoustic wave device outputs an electrical signal whose oscillation frequency changes to an oscillation circuit (11), and the oscillation circuit (11) detects a sudden change in the oscillation frequency of the electrical signal, and outputs the oscillation frequency to realize early warning and monitoring of icing . It has high detection sensitivity, good temperature stability, and can warn of icing in time, making SAW technology easier to implement.
Description
technical field [0001] The invention relates to the field of icing sensors, in particular to an icing sensor based on a surface acoustic wave oscillator. Background technique [0002] The phenomenon of icing widely exists in nature and the reality of human production and life. In the past, the detection of icing conditions was rarely implemented, on the one hand, because the demand was not high and the requirements were not high; on the other hand, because of the lack of feasible technical means. However, the negative impact and even harm caused by icing phenomenon to human society are more and more. For example, there are icing detection problems in road and aircraft safety. For road and aircraft icing monitoring, it needs to be small in size and can be measured flexibly. sensor. In order to monitor the icing condition of the road surface, aircraft and develop an effective road icing safety warning system, the icing sensor plays a vital role, and it must be very sensitive...
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IPC IPC(8): G01S15/04G01S7/521
CPCG01S15/04G01S7/521Y02A90/10
Inventor 王文尹怡宁贾雅娜范淑瑶梁勇刘梦伟
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI