800°C Femtosecond Fiber Bragg Grating Temperature Sensor - Single-Point/Multipoint FBG Thermometer - FBG Temperature Sensors

Product Alias: Femtosecond Fiber Bragg Grating Sensor, FBG Thermometer, Temperature Inducer, Temperature Probe, Thermometer, Fiber Optic Grating Probe, FBG Probe.

Product Function: Temperature measurement and detection with single or multi-point capability, resistant to low temperatures down to -270°C and high temperatures up to 1000°C.

Video explanation of the 800°C femtosecond FBG temperature sensor:

The OFSCN® 800°C Capillary Seamless Steel Tube Fiber Bragg Grating Temperature Sensor consists of a fiber connector (FC, SC, LC, ST, etc.), a stainless steel seamless tube, and a single/multi-point femtosecond fiber Bragg grating (FBG) package. The fiber Bragg grating is written using a femtosecond laser point-by-point writing method, and the fiber used is a pure silica core polyimide fiber.

This fiber Bragg grating sensor is characterized by its high sensitivity, fast heat conduction, good accuracy, small size, light weight, high tensile strength, high compressive strength, high-temperature resistance, water resistance, moisture resistance, non-combustibility, and corrosion resistance.

By utilizing the temperature measurement properties of the FBG, this sensor can be inserted, clamped, adhered, or embedded into the structure to be measured for temperature detection and monitoring. It can be widely used in industrial production, power, railways, military, aerospace, and other fields for single-point or quasi-distributed temperature measurement.

Recommended structure 01

Recommended structure 02

The OFSCN® 800°C Capillary Seamless Steel Tube Fiber Bragg Grating Temperature Sensor can be packaged with a single-point femtosecond fiber Bragg grating or a multi-point femtosecond fiber Bragg grating array (FBG fiber grating array).

This product is currently defined as an 800°C product, and the temperature range depends on the quality of the fiber and fiber Bragg grating.

The product uses a femtosecond fiber Bragg grating package that can be repeatedly used in an 800°C environment (it can be used at higher temperatures for a short time, up to 1000°C. After 24 hours in a 900°C test environment, the reflectivity of the femtosecond fiber Bragg grating degrades by 6%).

In terms of principle and practical measurements, this fiber Bragg grating temperature sensor (FBG thermometer) is a universal product and is not limited by the compatibility of fiber Bragg grating demodulation equipment. With a matching fiber Bragg grating demodulator, this product can also be referred to as an industrial Capillary FBG thermometer.

OFSCN® Capillary Seamless Steel Tube FBG Temperature Sensor (Single-Point)

OFSCN® Capillary Seamless Steel Tube FBG Temperature Sensor (FBG String/Array inside)

Overview of Fiber Bragg Grating Sensors:

Brand	OFSCN®
Fiber Bragg Grating Temperature Sensor Name	OFSCN® 800°C Capillary Seamless Steel Tube Fiber Bragg Grating Temperature Sensor
Fiber Bragg Grating Temperature Sensor Model	BNCG-SFBG-ZD800-02H-FC/APC-2M (multiple models available, example only)
	Product Structure: Prefabricated Fiber Connector + 2.0mm High-Temperature Resistant Alloy Pipe + 316L Stainless Steel Seamless Steel Pipe + 316L Stainless Steel Seamless Steel Pipe + Single/Multi-Point Femtosecond Fiber Bragg Grating + Tail Welding
※Length Range	From 10 centimeters to tens of meters (specific length depends on inventory)

Parameters of FBG used in Fiber Bragg Grating Temperature Sensor:

Single-point femtosecond FBG
Multi-point femtosecond FBG string (array)
Fiber type used for FBG	High-temperature fiber with a pure silicon core and polyimide coating
FBG fabrication method	Point-by-point inscription with femtosecond laser
FBG center wavelength	Standard range of 1525nm to 1565nm (other wavelengths can be customized)
FBG reflectivity	10% to 99%
FBG temperature measurement range	-200°C to +800°C, can be repeatedly used in an 800°C environment (can be used at higher temperatures, with a 6% degradation in grating reflectivity after 24 hours at 900°C)
※Optional FBG	Various options available for FBG parameters, direct communication is required.

Fiber Connector Specifications for FBG Temperature Sensor:

 

Fiber connector types for FBG temperature sensor	FC/APC、FC/PC、SC、LC、ST
Fiber connector end face types	APC	PC
Fiber connector core material	Ceramic
Fiber connector insertion loss	<0.2db	<0.2db
Fiber connector return loss	>-60db	>-40db
Fiber connector storage environment	-60℃ to +180℃
Fiber connector operating environment	-60℃ to +180℃
※ Additional options for fiber connector	FC/APC, FC/PC optional high-temperature connectors. High-temperature connector materials can withstand temperatures up to 550°C (subject to availability).

Armor and Tail End Specifications for FBG Temperature Sensor:

 

Armor type for FBG temperature sensor	OFSCN®Capillary Seamless Steel Tube Fiber/FBG Sensor Standard Packaging (Type 03)
Armor diameter for FBG temperature sensor	2.0mm
Material used for FBG temperature sensor	High-temperature alloy tube + 316L stainless steel(Optional) + 316L stainless steel (Two/Three-layer structure)
Wall thickness of seamless steel tube used for FBG temperature sensor	0.2mm+0.2mm(Optional)+0.15mm (Two/Three-layer structure)
Weight of seamless steel tube used for FBG temperature sensor	Approximately 15 g/m
Tensile strength of FBG temperature sensor	>1600N
Lateral pressure resistance of FBG temperature sensor	>9000N
Compression strength of FBG temperature sensor:	>180Mp
Tail end packaging form for FBG temperature sensor	High-temperature welding
Welding material for FBG temperature sensor	High-temperature alloy tube + 316L stainless steel (same as the material for armored main structure)
※ Additional options for armor and tail end	Sensor diameter (2.0mm/3.0mm), non-standard corrosion-resistant solution

OFSCN Fiber Bragg Grating (Fiber Optic Grating) Temperature Sensor Overview Video: