광섬유 브래그 격자 감지 기술 백과사전 - FBG FAQ - FBG 센서 FAQ - FBG 복조기 FAQ - FBG 일반 응용 문제 분석

This article discusses the sensitivity of FBG temperature sensors from the perspective of thermal conductivity (temperature change conduction speed). In 기타 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. 광섬유 브래그 격자 온도 센서의 열전도 감도 개념

FBG 온도 센서의 감도를 분석하는 또 다른 방법은 온도 변화에 대한 반응 속도를 고려하는 것입니다 (다른 기사와 관련하여 :'FBG 온도 센서의 감도 - 해상도 관점').
이러한 맥락에서 FBG 온도 센서의 감도는 측정 대상 또는 환경이 온도 변화를 겪을 때 센서가 온도 변화를 반영하는 데 걸리는 시간을 의미합니다.

고감도 센서는 온도 변화를 더 빠르게 감지할 수 있습니다. 이와 관련하여 열전도 효율성과 거리가 중요한 역할을 하며, 이는 광섬유 격자 센서의 재료 및 구조에 의해 영향을 받습니다.

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 및 structure of the sensors.

그림 1	그림 2

As shown in 그림 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 기타 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.

그림 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 그림 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.

그림 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, it 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:

		……

참고: 위 제품 그림은 실제 비율에 따라 그려졌으며, 두께는 다를 수 있습니다.

2019년 9월 9일, 참고:

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 및 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 및 environments, specific numerical values cannot be provided at this time.

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