Non-contact displacement measurement system

A displacement measurement, non-contact technology, used in measurement devices, instruments, optical devices, etc., can solve problems such as easy failure and inaccurate measurement, and achieve the effects of high sensitivity, high measurement accuracy, and good practicability

Pending Publication Date: 2021-06-29
CHENGDU KAITIAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to provide a non-contact displacement measurement system, which aims to solve the problem of inaccurate measurement and easy failure of current displacement measurement systems in high temperature and strong electromagnetic environments

Method used

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Experimental program
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Effect test

Embodiment 1

[0042] A non-contact displacement measurement system such as figure 1 , figure 2 As shown, it includes a light source module, a demodulation module, and a sensing module, and the demodulation module includes an A / D converter 16, a divider 17, and a demodulation system 18; the light source module is connected to the sensing module through a transmitting optical fiber 1 , the sensing module is connected to the photodetector through the receiving optical fiber, and the output ends of the photodetector are respectively connected to the demodulation system 18 through the A / D converter 16 and the divider 17; the sensing module includes a metal shell Body 9, sapphire glass 8, optical fiber bundle 5, optical fiber conversion connector 4, transmitting optical fiber 1, first receiving optical fiber 2, second receiving optical fiber 3; one end of the metal shell 9 is provided with a mounting groove, and the sapphire glass 8 is arranged in the mounting groove, and a cooling cavity is f...

Embodiment 2

[0047] This embodiment is optimized on the basis of embodiment 1, such as figure 2 As shown, a cooling circulation system 19 is also included, and a cooling circulation system 19 is also included. The two sides of the metal shell 9 are respectively provided with a cooling gas input channel 6 connected to an air outlet and an air inlet of the cooling circulation system 19, cooling The gas output channel 7; the cooling gas input channel 6 and the cooling gas output channel 7 communicate with the cooling cavity respectively. The cooling circulation system 19 transports cold air into the optical signal emitting part of the sensor probe through the cooling air input channel 6, and then the cold air is discharged from the cooling air output channel 7 to cool the sensor probe.

[0048] Further, it also includes a fixed pressure ring 10, and also includes a fixed pressure ring 10, a receiving seat is arranged inside the installation groove, the sapphire glass 8 is installed on the re...

Embodiment 3

[0053] This embodiment is optimized on the basis of embodiment 1 or 2, as figure 2 As shown, the light source module includes a drive circuit 11, a light source 12, and an optical isolator 13 that are sequentially connected from front to back; the light source 12 is connected to the other end of the emitting fiber 1 through an optical isolator 13; the photodetector includes PD1 photodetector 14 and PD2 photodetector 15 , the other ends of the first receiving optical fiber 2 and the second receiving optical fiber 3 are respectively connected to the PD1 photodetector 14 and PD2 photodetector 15 .

[0054]Further, the transmitting optical fiber 1 , the first receiving optical fiber 2 and the second receiving optical fiber 3 are single-mode optical fibers respectively. There are two receiving optical fibers at the receiving end of the optical fiber micro-displacement sensor, which are the first receiving optical fiber 2 and the second receiving optical fiber 3 respectively. By pe...

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Abstract

The invention discloses a non-contact displacement measurement system, which comprises a light source module, a demodulation module and a sensing module. The sensing module is connected with a photoelectric detector through a receiving optical fiber, and the output end of the photoelectric detector is connected with a demodulation system through an A/D converter and a divider. The sensing module comprises a metal shell, one end of the metal shell is provided with a mounting groove, the sapphire glass is arranged in the mounting groove, and a cooling cavity is formed between the sapphire glass and the mounting groove; an optical fiber bundle is installed in the cooling cavity, and one end of the transmitting optical fiber, one end of the first receiving optical fiber and one end of the second receiving optical fiber are converged to the optical fiber bundle arranged in the cooling cavity through optical fiber conversion connectors respectively; the interior of the cooling cavity is cooled through inert gas. External high-temperature and high-pressure gas can be isolated through the sapphire glass, heat is taken away through cold air circulation in the cooling cavity, normal work of the system is guaranteed, and good practicability is achieved.

Description

technical field [0001] 本发明属于位移测量的技术领域,具体涉及一种非接触式位移测量系统。 Background technique [0002] 在纳微米级的定位系统中,要求传感器能检测出微小的力和位移的信息。目前用于微位移检测的原理较多,如光学式位移传感器、光电式位移传感器、电感式位移传感器、电容式位移传感器、压电式位移传感器、以及超声波式位移传感器等多种类型。但这些位移传感器大多不能直接和长期应用于高温、高压等恶劣环境下。 [0003] 位移传感器又称为线性传感器,是应用最广泛的传感器之一。电容式位移传感器一般量程都很小,小于1mm,其精度特别高,一般用于厚度测量,但是需要事先对被测体的导电性进行标定再进行测量,响应频率为几千赫兹到几十K赫兹不等,量程一般是mm级,精度一般是μm级。超声波式传感器属于非接触式测量传感器,其精度高,但由于声波脉冲间具有一定的间隔,因此,它只能实现准实时的位移检测,而不能实现实时的位移测量。电感式位移传感器,按其结构和原理一般都是由固定线圈和可动铁芯组成,当铁芯在线圈内沿轴向运动时,通过线圈电感的变化达到检测位移的目的。这些传统的位移传感器,普遍存在着测量范围较窄,结构较复杂,易受电磁干扰,应用场合有限等问题。 [0004] 随着光纤制造技术的迅速发展和光纤材料的深入研究,光纤传感技术也得到了快速发展。光纤传感器与传统的各类传感器相比,具有灵敏度高、抗电磁干扰能力强、耐腐蚀、耐高温、结构简单、体积小、重量轻等一系列独特的优点。因此,其在高温高压、辐射环境、工况监测、微机电等领域都具有极好的应用前景。以光作为传感和传导媒介的最大优势是传输容量大、抗电磁干扰能力强,以及作为光波载体的光纤(光波导)所具有的化学惰性和柔软性,光纤在传感领域不仅仅作为光信号的传输载体,而且开始成为传感的敏感单元。通过强度调制、相位调制等一系列手段调制光信号,使光信号直接成为位移、温度、压力、应变等传感量的测量手段。在智能材料、智能结构和大型结构监测,高电压、强磁场、核辐射以及生物医学等方面,光纤传感器是非常具有竞争力的测量手段。经过这些年的发展,光纤传感器在科研与工业应用中已经占有重要的一席之地,其主要的原因在于光纤与金属导线之间的根本区别,这一区别是由于光纤传感器具有以下一些独特的优点: [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 代志国代勇波谭银银谭向军刘利
Owner CHENGDU KAITIAN ELECTRONICS
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