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Temperature sensor and related remote temperature sensing method

A technology of temperature sensor and Curie temperature, which is applied in the parts of thermometers, thermometers, thermometers with electric/magnetic elements that are directly sensitive to heat, etc.

Inactive Publication Date: 2013-12-25
METGLAS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such circuits become very bulky and need to be avoided

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  • Temperature sensor and related remote temperature sensing method
  • Temperature sensor and related remote temperature sensing method
  • Temperature sensor and related remote temperature sensing method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] Sample Preparation

[0050] The amorphous magnetic alloy used in the examples of the present invention was prepared by the metal casting method disclosed in US Patent No. 4,142,571. The casting material is in the form of a strip having a thickness of approximately 20 μm and a width in the range of approximately 25 mm to 213 mm.

[0051] The cast strip is then split into narrower strips having a width in the range of approximately 0.5 mm to 10 mm. If necessary, the split strip is heat treated to change its magnetic properties. The strips thus prepared were cut into segments at variable lengths.

example 2

[0053] The magnetic induction B is measured as a function of the applied magnetic field H using commercially available dc BH loop measuring equipment. figure 1 obtained by using this device.

example 3

[0055] The temperature sensor strip element of Example 1 was placed in an excited AC field at a predetermined fundamental frequency, and the higher harmonic response of the temperature sensor strip element was measured through the coil housing the strip element. Both the excitation coil and the signal detection coil are wound on bobbins with a diameter of about 50 mm. The number of turns of the excitation coil and the number of turns of the signal detection coil are about 180 and about 250, respectively. Inside the 50 mm diameter bobbin, a non-magnetic tube is inserted in which is placed a sample heating element that changes the temperature of the strip sample. The temperature of the strip element was determined by attaching a thermocouple directly to one end of the strip element. The fundamental excitation AC field was chosen to be 2.4kHz and its voltage at the excitation coil was about 80mV. The 25th harmonic voltage from the signal detection coil was measured by a commerc...

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Abstract

A temperature sensor includes a plurality of rectangular shaped amorphous magnetic alloy strips connected magnetically, wherein at least one of the strips has a predetermined ferromagnetic Curie temperature, and another strip has a magnetic permeability well exceeding 2,000. The temperature sensor may be used in a related remote temperature sensing method wherein the sensor is interrogated by a magnetic field and the temperature sensor's response signal is detected electromagnetically.

Description

technical field [0001] This application relates to the field of temperature sensing. In particular, the present invention relates to a magnetic sensor utilizing the Curie magnetic transition of an amorphous ferromagnetic material and a remote temperature sensing method using the same. Background technique [0002] There are many techniques and tools available for measuring temperature, including such well-known temperature indicators as conventional mercury thermometers, thermocouples, resistance thermometers, and bimetallic strips. All of these techniques and tools exploit some fundamental physical phenomena that vary with temperature and thus have unique characteristics. For example, mercury thermometers are effective at visual sensing of temperature, but are not suitable for converting temperature directly into an electrical signal. If an electronic reading of temperature is required, a thermocouple that utilizes the thermoelectric effect of metals is more suitable. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/00
CPCG01K1/024G01K7/38
Inventor 留舒克·哈塞甘瓦戴希斯·阿苏玛
Owner METGLAS INC