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共通アプリケーション問題分析

This article discusses the sensitivity of FBG temperature sensors from the perspective of thermal conductivity (temperature change conduction speed). In その他 words, it refers to the ability of FBG temperature sensors to detect accurate temperature changes in the shortest possible time (their response capability to rapidly changing temperatures). It also highlights the high sensitivity and fast thermal conduction of the encapsulation materials and structure used in the OFSCN® capillary seamless steel tube series FBG temperature sensors.

1. ファイバーブラッググレーティング温度センサーにおける熱伝導感度の概念

FBG温度センサーの感度を分析するもう一つの方法は、温度変化に対する応答速度を考慮することです（別の記事に関連して：「FBG温度センサーの感度 - 分解能の視点」）。
この文脈において、FBG温度センサーの感度とは、測定対象物または環境が温度変化する際に、センサーが温度変化を反映するまでにかかる時間を指します。

高感度センサーは、温度変化をより迅速に検出することができます。この点において、熱伝導効率と距離が重要な役割を果たし、これは光ファイバーグレーティングセンサーの材料と構造に影響されます。

2. Reasons for High Thermal Conductivity Sensitivity of OFSCN® Capillary Seamless Steel Tube FBG Temperature Sensors

OFSCN® capillary seamless steel tube FBG temperature sensors ( FBG thermometer, FBG temperature probe ), provided by DCYS, have high sensitivity. The secret of it lies in the material と structure of the sensors.

図1	図2

As shown in 図1, 2, and 3, OFSCN® capillary seamless steel tube FBG temperature sensors adopt a unique patented technology of stainless steel seamless tube encapsulation. With a minimalist-style design and absence of adhesives or auxiliary materials, these sensors exhibit exceptional sensitivity and quickly respond to temperature changes in the tested environment.

The stainless steel material used in OFSCN® capillary seamless steel tube FBG temperature sensors has a thermal conductivity rate of 0.16/(W/m℃)×10², which is relatively high compared to その他 commonly used materials. Additionally, the small size of the sensor, with a diameter ranging from 0.9mm to 0.6mm, results in a short thermal conductivity distance. Consequently, the entire sensor demonstrates high sensitivity, promptly reflecting temperature fluctuations in the tested objects and environment.

図3

In addition, because the volume of OFSCN® capillary seamless steel tube FBG temperature sensor (FBG thermometer, FBG temperature probe) is small, the main structure diameter is generally only 0.9 mm, and the minimum diameter is 0.6 mm ( see 図4 below ). Therefore, the thermal conductivity distance is very short. Reflected in the demodulation equipment, it shows that the sensitivity of the entire sensor is very high, which can quickly reflect the rapid temperature change of measured object and environmental.

図4

3. Enhancing or Reducing the Thermal Conductivity Sensitivity of OFSCN® Capillary Seamless Steel Tube FBG Temperature Sensors

Of course, when we use the OFSCN® capillary seamless steel tube FBG temperature sensor (FBG thermometer, FBG temperature probe ) for temperature testing, それ is not all the faster the sensor thermal conduction speed requires the better.

The thermal conductivity speed of OFSCN® capillary seamless steel tube FBG temperature sensors can be customized by altering the structure based on the stainless steel seamless tube encapsulation technology provided by DCYS. These modifications enable the adjustment of the sensor's thermal conductivity sensitivity according to specific requirements. For example:

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注：上記の製品イラストは、厚さは異なる場合がありますが、実際の比率に基づいて描かれています。

2019年9月9日、注記：

After discussing with industry experts, it has been confirmed that FBG sensors can detect temperature changes at a rate of at least 1000Hz, meaning they can reflect temperature variations over 1000 times per second. Due to the advantages brought by the unique structure と patented design of OFSCN® capillary seamless steel tube FBG temperature sensors, I have great confidence in their thermal conductivity sensitivity. However, due to limitations in testing methods と environments, specific numerical values cannot be provided at this time.

Our philosophy is: 'OFSCN®, make optical fiber stronger!'