Enzyklopädie der Faser-Bragg-Gitter-Sensortechnologie - FBG-FAQ - FBG-Sensor-FAQ - FBG-Demodulator-FAQ - FBG-Analyse häufiger Anwendungsprobleme

This article analyzes the advantages und benefits brought by good pressure resistance in FBG sensors, including the expansion of application environments und 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 und parameters.

1. Struktur und Vorteile von hochdruckbeständigen Faser-Bragg-Gitter-Sensoren (FBG-Sensoren) (FBG-Thermometer, FBG-Temperaturfühler)

Die Fähigkeit, Druck (extern, intern und lateral) zu widerstehen, bestimmt direkt die Umgebungen, in denen FBG-Sensoren eingesetzt werden können, und beeinflusst auch die technische Konstruktion von FBG-Sensoren (FBG-Sonden). Lassen Sie uns kurz die Vorteile erklären, die eine gute Druckbeständigkeit für FBG-Sensoren (FBG-Sonden) aus der Perspektive der Druckbeständigkeit mit sich bringt.

Abbildung 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 und 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, und lateral pressure.

Abbildung 2	Abbildung 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 und 2). Based on our calculations, the pressure resistance of the main body of the sensor is greater than 180 MPa (external pressure).。

Abbildung 4

Die Zahl 180 MPa ist für viele Menschen möglicherweise nicht intuitiv verständlich. Im täglichen Leben beträgt der atmosphärische Druck etwa 0,1 MPa, was ungefähr dem Wasserdruck in einer Tiefe von 10 Metern unter Wasser entspricht. 1 MPa entspricht ungefähr dem Wasserdruck in einer Tiefe von 100 Metern unter Wasser, und 180 MPa entspricht ungefähr dem Wasserdruck in einer Tiefe von 18.000 Metern unter Wasser.

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 und 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!'

Abbildung 5

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

3. Application und 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, und seamless steel tube sensing cables), communication und 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 und losses in construction, thus lowering the installation cost of the grating sensors.

Darüber hinaus ist es unvermeidlich, dass es während der technischen Konstruktion zu Kollisionen kommt und die Gittersensoren direkt von anderen Materialien oder Prüfobjekten bedeckt oder gequetscht werden können. In solchen Situationen wird die Fähigkeit der Sensoren, seitlichem Druck standzuhalten, entscheidend.

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 und withstand repeated pressure from small cars. Apart from surface wear, there will be no actual damage to the sensors.