Enciclopédia de Tecnologia de Sensoriamento de Fibra Bragg Grating - FAQ FBG - FAQ Sensor FBG - FAQ Demodulador FBG - Análise de Problemas Comuns de Aplicação FBG

This article discusses the sensitivity of FBG temperature sensors from the perspective of thermal conductivity (temperature change conduction speed). In Outros 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. Conceito de Sensibilidade de Condutividade Térmica em Sensores de Temperatura de Fibra Bragg Grating

Outra forma de analisar a sensibilidade dos sensores de temperatura FBG é considerando sua velocidade de resposta às mudanças de temperatura (em relação a outro artigo:'Sensibilidade dos Sensores de Temperatura FBG - Perspectiva de Resolução').
Neste contexto, a sensibilidade dos sensores de temperatura FBG refere-se ao tempo que o sensor leva para refletir as mudanças de temperatura quando o objeto ou ambiente medido sofre variações de temperatura.

Um sensor altamente sensível é capaz de detecção mais rápida de variações de temperatura. A este respeito, a eficiência da condutividade térmica e a distância desempenham um papel crucial, que é influenciado pelo material e estrutura do sensor de grade de fibra óptica.

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 e structure of the sensors.

Figura 1	Figura 2

As shown in Figura 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 Outros 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.

Figura 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 Figura 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.

Figura 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:

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Nota: As ilustrações dos produtos acima, o tamanho é desenhado de acordo com a proporção real, embora a espessura possa variar.

9 de Setembro de 2019, Nota:

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

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