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Optical fiber microbubble concentration sensor based on nano-gold film and its sensing method

A concentration sensor and nano-gold technology, which is applied in the field of optical fiber, can solve problems such as limited application range, complicated manufacturing process, and inapplicability to liquid concentration measurement, and achieve the effects of integration, flexible control, and fixed-point measurement

Active Publication Date: 2020-02-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of fiber optic sensor has high sensitivity and accurate measurement, but the manufacturing process is relatively complicated, and the high-precision spectral demodulation instrument also greatly increases the cost of the device, and even requires the ability of the operator, which limits its application range
[0003] In order to overcome the above problems, the application number is: 201610871752, and the patent name is: the Chinese patent of optical fiber microbubble method sensor and its sensing method discloses a carbon nanotube film coated on the end surface of the optical fiber, through the heat transfer of the carbon nanotube film performance, produce microbubbles, and realize the measurement of physical quantities such as flow velocity and temperature; however, this sensor can only be used for the measurement of physical quantities in liquid environments, and is not suitable for liquid concentration measurement

Method used

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  • Optical fiber microbubble concentration sensor based on nano-gold film and its sensing method
  • Optical fiber microbubble concentration sensor based on nano-gold film and its sensing method
  • Optical fiber microbubble concentration sensor based on nano-gold film and its sensing method

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Embodiment 1

[0022] The sensing device of the optical fiber microbubble concentration sensor based on the photothermal effect of the nano-gold film provided in this embodiment has a structure such as figure 1 As shown, it includes: 1550nm laser 1, 1550 single-mode fiber 2, nano-gold film 3, microbubble 4, microfluidic channel 5, and sensor 6.

[0023] Among them, the ordinary single-mode fiber 2 is a single-mode fiber with a working wavelength of 1550nm. The fiber core is very thin, the core diameter is generally 8 to 10um, and the cladding diameter is 125um. It is a commonly used single-mode fiber in the communication band; nano-gold film 3 has a thickness of 1 nm.

[0024] Splice each section of optical fiber, and the specific operation method of fusion splicing is as follows: first prepare the end face of the optical fiber, strip off the coating layer of the optical fiber, and clean the bare fiber after stripping the coating layer of the optical fiber to prevent pollution, cut the bare ...

Embodiment 2

[0028] This embodiment is further limited on the basis of Embodiment 1. The sensor 6 is a uniform nano-gold film 3 plated at the end face of a cut flat 1550 single-mode optical fiber. According to the photothermal characteristics of the nano-gold film, the Generates microbubbles 4, the microbubble structures used for sensing. Most of the probe-type optical fiber sensors in the prior art adopt the method of micromachining on the end face of the optical fiber. The manufacturing process of these methods is complicated and difficult. Preparation time reduces costs.

Embodiment 3

[0030] This embodiment also provides a method for preparing an optical fiber microbubble concentration sensor based on the photothermal effect of a nano-gold film, which specifically includes the following steps:

[0031] Step 1): cutting one end face of the single-mode optical fiber flat to obtain a flat end face of the optical fiber;

[0032] Step 2): Place the single-mode optical fiber in the gold-spraying instrument, with the flat end facing the gold target vertically and fix it;

[0033] Step 3): By adjusting the parameters of the gold spraying instrument, the coating thickness on the flat end surface of the single-mode optical fiber is controlled, and the operation of plating nano-gold film on the flat end surface of the single-mode optical fiber is completed to obtain a sensor.

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Abstract

The invention belongs to the field of optical fiber technology, and specifically provides an optical fiber microbubble concentration sensor and a sensing method based on a nano-gold film, which are used to realize the measurement of liquid concentration. The present invention is based on the photothermal effect of the nano-gold film. The optical fiber microbubble concentration sensor is composed of a single-mode optical fiber and a nano-gold film uniformly sputtered on the flat end surface of the single-mode fiber; the sensor is immersed in a liquid environment, and the light provided by the laser The energy is transmitted through a single-mode optical fiber, emitted from the flat end of the optical fiber, irradiated on the nano-gold film, and micro-bubbles are formed at the nano-gold film, and the change of the size of the micro-bubbles per unit time is detected by microscopic imaging technology to realize the transmission of the liquid concentration. sense. The invention provides an optical fiber microbubble concentration sensor with simple structure, small volume, low cost and flexible operation, which can sense the concentration information at any position in the microfluidic system; and adopts microscopic imaging technology to directly observe changes in microbubbles, reducing The operational difficulty and cost of detection.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, relates to an optical fiber microbubble concentration sensor, and specifically provides an optical fiber microbubble concentration sensor based on the photothermal effect of a nano-gold film and a sensing method thereof. Background technique [0002] Due to the advantages of high sensitivity, anti-electromagnetic interference, small size and light weight, optical fiber sensors are widely used in petrochemical, electric power, medicine, civil engineering and many other fields in terms of communication and sensing technology. Most of the traditional optical fiber sensors use micro-processing technology to process micro-nano structures on the optical fiber, such as Farper micro-interference cavities, fiber gratings, etc., and realize sensing by changing the spectral characteristics of the sensor's transmitted or reflected light waves with the measured changes. This type of fiber optic sensor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
CPCG01D5/268
Inventor 龚元张晨琳饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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