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Surface acoustic wave sensor frequency-temperature analytical time domain algorithm

A surface acoustic wave and sensor technology, which is applied to thermometers, thermometers and instruments using electric/magnetic elements that are directly sensitive to heat, can solve the problem of high temperature monitoring accuracy and achieve high monitoring accuracy.

Inactive Publication Date: 2014-05-14
SICHUAN SHENGWEI IT
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Problems solved by technology

However, in the field of temperature monitoring in the switchgear, the accuracy of temperature monitoring is very high, how to achieve the measurement accuracy of temperature is a problem worth studying

Method used

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Embodiment

[0018] A surface acoustic wave sensor frequency-temperature analysis time domain algorithm, which includes the following steps:

[0019] Step 1: Determine the natural frequency f of the SAW sensor 0 ;

[0020] Step 2: Make the reflection frequency f of the SAW sensor equal to the natural frequency f 0 ;

[0021] Step 3: Determine the relationship between temperature and reflection frequency, the relationship between the frequency and temperature of the surface acoustic wave sensor can be expressed by the following formula: f 0 (T) = f 0 (T 0 )[1+a f (1) (T-T 0 )+ a f (2) (T-T 0 ) 2 + a f (3) (T-T 0 ) 3 +…], where a f (i)w is the reference temperature T 0 Lower i-order temperature coefficient;

[0022] Step 4: Based on the relationship between temperature and reflected frequency, get the temperature value.

[0023] In step 1, it is determined by the following formula: f 0 =V S / 2L, where V S is the propagation velocity of the surface acoustic wave in the ...

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Abstract

The invention discloses a surface acoustic wave sensor frequency-temperature analytical time domain algorithm. The surface acoustic wave sensor frequency-temperature analytical time domain algorithm is characterized in that the surface acoustic wave sensor frequency-temperature analytical time domain algorithm comprises the following steps that: step 1, the natural frequency f0 of a surface acoustic wave sensor is determined; step 2, the reflection frequency f of the surface acoustic wave sensor is made to be equal to the natural frequency f0; step 3, a relationship between temperature and the reflection frequency is determined, and the relationship between the frequency of the surface acoustic wave sensor and the temperature can be represented by the formula that f0(T)=f0(T0)[1+a<f>(1)(T-T0)+a<f>(2)(T-T0)2+a<f>(3)(T-T0)3+...], wherein a<f>(i) w is an i-order temperature coefficient under a reference temperature T0; and step 4, a temperature value can be obtained according to the relationship between the temperature and the reflection frequency. With the surface acoustic wave sensor frequency-temperature analytical time domain algorithm adopted, temperature inside a switch cabinet can be analyzed according to the change of the frequency. The monitoring precision of the surface acoustic wave sensor frequency-temperature analytical time domain algorithm can be so high that the precision can be within 1 DEG C.

Description

technical field [0001] The invention relates to a frequency-temperature analysis time-domain algorithm, more specifically to a frequency-temperature analysis time-domain algorithm of a surface acoustic wave sensor. Background technique [0002] The surface acoustic wave sensor is a passive device, which is a new advanced sensor developed in recent years, and is developing rapidly. Surface acoustic wave sensors have advantages that ordinary sensors do not have, and are especially suitable for telemetry and sensing of some inaccessible specific environments. SAW sensors are divided into two types according to the detection principle: delay type and resonance type. However, most passive wireless sensor research focuses on the principles and application issues of delay-type and resonant-type SAW sensors. Due to the limited electromagnetic energy of spatial excitation and the small size of the sensor, surface acoustic wave sensors are more and more widely used in the field of t...

Claims

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Application Information

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IPC IPC(8): G01K7/32
Inventor 曹有平
Owner SICHUAN SHENGWEI IT
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