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Temperature control device and method based on phase transformation characteristics of ferroelectric crystal

A technology of ferroelectric crystal and phase change characteristics, which is applied in the field of intelligent temperature control equipment and can solve the problems of poor accuracy of temperature control devices and so on.

Inactive Publication Date: 2015-03-25
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of poor accuracy of the existing temperature control device, the present invention proposes a temperature control device and a temperature control method based on the phase transition characteristics of ferroelectric crystals

Method used

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  • Temperature control device and method based on phase transformation characteristics of ferroelectric crystal
  • Temperature control device and method based on phase transformation characteristics of ferroelectric crystal
  • Temperature control device and method based on phase transformation characteristics of ferroelectric crystal

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specific Embodiment approach 1

[0018] Specific implementation mode 1. Combination figure 1 Describe this embodiment, a temperature control device based on the phase transition characteristics of ferroelectric crystals described in this embodiment, the device includes a laser 1, a temperature control device 2, a ferroelectric crystal 3, a photodetector 4, and a signal processor 5 and computer 6;

[0019] The single crystal 3 is placed in the temperature control device 2, and the two opposite side walls of the temperature control device 2 are oppositely opened with two light-transmitting holes, the ferroelectric crystal 3 and the two light-transmitting holes are located on the same straight line, and the photoelectric detection The laser device 4 and the laser device 1 are respectively located on both sides of the temperature control device 2, and the laser emission port of the laser device 1, the photosensitive surface of the ferroelectric crystal 3 and the photodetector 4 are located on the same straight li...

specific Embodiment approach 2

[0020] Embodiment 2. This embodiment is a further description of the temperature control device based on the phase transition characteristics of ferroelectric crystals described in Embodiment 1. The ferroelectric crystal 3 includes a relaxor ferroelectric crystal and a non-relaxation ferroelectric crystal. crystals.

[0021] The relaxed ferroelectric crystals include (1-x)PMN-xPT crystals (x≥0.35), (1-x-y)PIN-yPMN-xPT crystals (x≥0.35, x+y≤1) and (1-x )PZN-xPT crystal (x≥0.09); non-relaxation ferroelectric crystal BaTiO 3 crystal and doped BaTiO based on it 3 Crystals, ferroelectric crystals 3 materials can be divided into two categories: relaxor ferroelectric crystals represented by PMNT, PZNT and other crystals and non-relaxor ferroelectric crystals represented by LiNbO3, BaTiO3 and other crystals. Ferroelectric crystals have different Curie temperatures due to different materials, and we can choose the applied crystals according to actual needs.

specific Embodiment approach 3

[0022] Embodiment 3. This embodiment is a further description of the temperature control device based on the phase transition characteristics of ferroelectric crystals described in Embodiment 1. The wavelength range of the laser 1 is 450-1000 nm.

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Abstract

The invention belongs to the field of intelligent temperature control equipment and discloses a temperature control device and method based on phase transformation characteristics of a ferroelectric crystal. The temperature control device and method solve the problem that an existing temperature control device is poor in accuracy. The adopted ferroelectric crystal is subjected to electrode preparation and polarization operation, the polarized ferroelectric crystal is put into a temperature changing environment, and a dielectric constant-temperature curve of the ferroelectric crystal is drawn; the dielectric constant-temperature curve of the ferroelectric crystal is stored in a computer, the ferroelectric crystal is arranged in a device with temperature to be controlled, a laser is adopted for emitting light beams to the ferroelectric crystal, a photoelectric detector collects light intensity signals passing through the ferroelectric crystal, the received light intensity signals are converted into electric signals to be sent to the computer, and the computer obtains the temperature information in the current device with temperature to be controlled according to the dielectric constant-temperature curve of the ferroelectric crystal; the computer sends temperature control signals to the temperature control device according to the temperature information, and temperature control based on the phase transformation characteristics of the ferroelectric crystal is achieved. The temperature control device and method based on the phase transformation characteristics of the ferroelectric crystal are applicable to controlling temperature.

Description

technical field [0001] The invention belongs to the field of intelligent temperature control equipment. Background technique [0002] In recent years, ferroelectric crystals have attracted much attention in the research field, and their excellent optical properties indicate that the crystals have great application potential in the field of optical devices. Phase transitions in crystals lead to changes in their optical properties. When the ferroelectric crystal is below the Curie temperature, it presents a ferroelectric phase. At this time, the ferroelectric domains inside the crystal will scatter the light incident on the crystal, and its optical transmission performance is very poor. When the temperature exceeds the Curie temperature of the crystal, the crystal presents a paraelectric phase, and there is no ferroelectric domain structure inside the crystal. When light is incident on the crystal, there will be no domain wall scattering of light, and the optical transparency...

Claims

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Application Information

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IPC IPC(8): G05D23/27
Inventor 吴丰民张景云陈春天贺训军杨彬高敏姜久兴孙恩伟曹文武
Owner HARBIN UNIV OF SCI & TECH
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