光ファイバーブラッググレーティングセンシング技術百科事典 - FBG FAQ - FBGセンサー FAQ - FBG復調器 FAQ - FBG一般的な応用問題分析

This article analyzes the advantages および benefits brought by good pressure resistance in FBG sensors, including the expansion of application environments および the convenience in engineering construction. It also introduces the 'OFSCN® Capillary Seamless Steel Tube Series Fiber Bragg Grating Sensor'  produced by DCYS (These series of products are all high-pressure-resistant fiber optic gratingFBG sensors used for temperature, strain, or stress measurements). It shows part of the physical illustrations および parameters.

1. 高耐圧ファイバーブラッググレーティングセンサー（FBGセンサー）の構造と利点（FBG温度計、FBG温度プローブ）

圧力（外部、内部、横方向）に耐える能力は、FBGセンサーが使用できる環境を直接決定し、FBGセンサー（FBGプローブ）の工学的構造にも影響を与えます。良好な耐圧性がFBGセンサー（FBGプローブ）にもたらす利点を、耐圧性の観点から簡単に説明しましょう。

図1

The 'OFSCN® Capillary Seamless Steel Tube FBG Sensor' produced by DCYS is made of stainless steel seamless tubes. Benefiting from the characteristics of stainless steel material および seamless tube structure, this series of FBG sensors ( FBG probes) has high pressure resistance. The high pressure resistance mentioned here includes the ability to withstand external pressure, internal pressure, および lateral pressure.

図2	図3

2. Pressure  Resistance of OFSCN® Capillary® Seamless Steel Tube Fiber Bragg Grating Sensors (FBG sensors, FBG probes)

The main body of the OFSCN® Capillary Seamless Steel Tube FBG sensor ( FBG probe) is made of stainless steel seamless tubes. The standard outer diameter of the OFSCN® Capillary Seamless Steel Tube FBG sensor ( FBG probe) is 0.9 mm, with a wall thickness of 0.18 mm (see Figures 1 および 2). Based on our calculations, the pressure resistance of the main body of the sensor is greater than 180 MPa (external pressure).。

図4

180 MPaという数値は、多くの人にとって直感的に理解しにくいかもしれません。日常生活において、大気圧は約0.1 MPaであり、これは水深10メートルの水圧にほぼ相当します。1 MPaは水深100メートルの水圧にほぼ相当し、180 MPaは水深18,000メートルの水圧にほぼ相当します。

The deepest known point on Earth is the Mariana Trench, with a depth of 11,034 meters (approximately 110 MPa of pressure). If someone commissioned us to produce an OFSCN® Capillary Seamless Steel Tube FBG Sensor of such length および threw it into the deepest part of the Earth for fiber sensing, there would be no problem. Our sensor would not be damaged by the water pressure at that depth. Because our philosophy is: 'OFSCN®, make optical fiber stronger!'

図5

In terms of pressure resistance, there is no comparison between OFSCN® Capillary Seamless Steel Tube FBG Sensors および traditional FBG sensors. They are not product in the same level, so there is no need to elaborate further.

3. Application および Construction Advantages of OFSCN® Capillary Seamless Steel Tube Fiber Bragg Grating Sensors (FBG sensors , FBG probes) with High Pressure Resistance

The high pressure resistance of OFSCN® Capillary Seamless Steel Tube FBG Sensors greatly expands their range of applications. In the past, it was challenging to measure high-pressure locations deep within the Earth, but with the availability of OFSCN® seamless steel tube products (including FBG sensors, distributed fiber optic sensors, special fiber optic jumpers, および seamless steel tube sensing cables), communication および measurement in these high-pressure locations have become less difficult.

In terms of engineering construction, similar to the advantages of high tensile strength, the high pressure resistance of OFSCN® Capillary Seamless Steel Tube FBG Sensors directly reduces the difficulty および losses in construction, thus lowering the installation cost of the grating sensors.

さらに、工学的な建設中に衝突が発生することは避けられず、グレーティングセンサーが他の材料や試験対象物によって直接覆われたり、押し潰されたりする可能性があります。このような状況では、センサーが横方向の圧力に耐える能力が非常に重要になります。

Based on our calculations, the standard OFSCN® Capillary Seamless Steel Tube FBG Sensor can withstand lateral pressure of more than 9000 N. In practical applications, our FBG sensors can be placed on the road surface および withstand repeated pressure from small cars. Apart from surface wear, there will be no actual damage to the sensors.