Temperature sensor

A technology for temperature sensor and temperature detection, which is applied in thermometers, instruments, and thermometers based on the expansion/contraction of materials, etc., which can solve the problem of insufficient accuracy of temperature sensors

CN113358234AActive Publication Date: 2021-09-07SHANDONG FIRST MEDICAL UNIV & SHANDONG ACADEMY OF MEDICAL SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-09-07

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Abstract

The invention belongs to the technical field of sensing devices, and particularly relates to a temperature sensor which comprises an optical fiber, a laser is arranged at one end of the optical fiber, a detector is arranged at the end, away from the laser, of the optical fiber, a thermal expansion part is arranged in the middle of the optical fiber, a filter is arranged between the thermal expansion part and the detector, nanoparticles are arranged in the thermal expansion part, and a thermal shrinkage part is arranged on the outer wall of the thermal expansion part. The thermal expansion part is used for capturing temperature changes, when the temperature changes, the thermal expansion part expands and deforms, and the concentration of the nanoparticles in the thermal expansion part also changes, so that the temperature changes are converted into the concentration changes of the nanoparticles in the thermal expansion part, and the concentration changes of the nanoparticles have great influence on the light intensity; therefore, the temperature can be detected by measuring the light intensity, the detection sensitivity is high, the thermal expansion part generates an up-conversion luminescence phenomenon under the action of light, the capturability of the light is increased, and the measurement precision is improved.
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Description

technical field

[0001] The invention relates to the technical field of sensing devices, in particular to a temperature sensor. Background technique

[0002] A temperature sensor is a sensor that senses temperature and converts it into a usable output signal. The temperature sensor is the core part of the temperature measuring instrument, and there are many varieties. According to the measurement method, it can be divided into two categories: contact type and non-contact type. According to the characteristics of sensor materials and electronic components, it can be divided into two types: thermal resistance and thermocouple.

[0003] Temperature is a physical quantity that characterizes the degree of hot or cold of an object, and it is a sign of the intensity of molecular thermal motion inside the object. The smoother the molecular motion, the lower the temperature. In the fields of daily life, industry and commerce, aerospace and transportation, temperature is very importa...

Examples

Embodiment 1

[0025] see figure 1 , figure 2 , Figure 4 , a temperature sensor, comprising an optical fiber 1, a laser 2 is arranged at one end of the optical fiber 1, a detector 3 is arranged at an end of the optical fiber 1 away from the laser 2, a thermal expansion part 4 is arranged at a middle position of the optical fiber 1, and a thermal expansion part 4 and the detector 3 are arranged A filter 5 is provided, a nanoparticle 6 is arranged in the thermal expansion part 4, a thermal contraction part 7 is provided on the outer wall of the thermal expansion part 4, a fixed part 8 is provided at both ends of the thermal expansion part 4, the thermal expansion part 4 is a transparent thermal expansion material, and the nanoparticle 6 It is NaYF4 doped with rare earth.

[0026] Specifically, when working, the laser 2 emits laser light, transmits and irradiates the thermal expansion part 4 through the optical fiber 1, and the nanocomposite material in the middle of the thermal expansion p...

Embodiment 2

[0031] On the basis of specific embodiment 1, please refer to figure 2 , image 3 Specifically, the heat shrinkable part 7 is connected to the outer wall of the heat expandable part 4 by sticking, and the material of the heat shrinkable part 7 is cross-linked polyethylene material. A circle of thermal contraction part 7 is arranged outside the thermal expansion part 4. When detecting the temperature, the thermal expansion part 4 is thermally expanded, and the thermal contraction part 7 is thermally contracted. The thermal contraction part 7 produces an inward pressure on the thermal expansion part 4, so that the thermal expansion part 4 Expanding to both sides, therefore, the thermal expansion part 4 will become longer, the concentration of nanoparticles 6 inside it will change more obviously, and the resulting light intensity will also change more obviously, which can effectively improve the detection accuracy and sensitivity.

Embodiment 3

[0033] On the basis of specific embodiment 1, special, please refer to Figure 4 , the shape of the fixing part 8 is wedge-shaped, and there are two fixing parts 8, which are distributed symmetrically at the top and bottom of the thermal expansion part 4 respectively. Wedge-shaped fixing parts 8 are provided at both ends of the thermal expansion part 4. When the thermal expansion part 4 expands in volume due to the influence of temperature, the upper and lower fixing parts 8 will generate forces in different directions on the thermal expansion part 4, so that the thermal expansion part 4 is twisted and the inside The change of the concentration of nanoparticles 6 is more obvious, so the change of the light intensity produced is more obvious, which can effectively improve the detection accuracy and sensitivity.

[0034] The relevant content of the temperature sensor is as described above, and will not be repeated here.