OFSCN® Polymer-encapsulated Fiber Bragg Grating Strain Sensor (1.5mm/2.3mm diameter)
What is the price for use in seawater at a depth of 50m, including the installation frame and cable?
Regarding the inquiry about using the OFSCN® Polymer-encapsulated Fiber Bragg Grating Strain Sensor (1.5mm/2.3mm diameter), along with its supporting installation frame and cables, in a subsea environment at a depth of 50\text{m} , this analysis addresses the technical feasibility and price structure from optical and structural engineering perspectives:
I. Technical Feasibility Analysis for a 50-Meter Subsea Environment
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Hydrostatic Pressure Bearing Capacity:
At a subsea depth of 50\text{m} , the sensor and transmission cable must withstand a hydrostatic external pressure of approximately 0.5\ \text{MPa} (around 5\ \text{bar} ). The sensor model utilizes a polymer-encapsulated fiber Bragg grating, with an additional seamless stainless steel tube as the outer layer. The default outer diameter is \le 1.5\ \text{mm} , and with an added protective layer, it is \le 2.3\ \text{mm} . The high rigidity of the seamless metal steel tube can easily resist 0.5\ \text{MPa} of external pressure, ensuring that the internal fiber Bragg grating (FBG) is not affected by lateral pressure, thus achieving purely axial strain measurement. -
Waterproofing and Corrosion Resistance:
The seamless steel tube encapsulation provides excellent longitudinal and radial waterproof and moisture-proof performance. For seawater, a highly corrosive environment, the steel tube material can be customized to corrosion-resistant stainless steel grades (such as 316L or duplex steel) to ensure structural integrity during long-term immersion. -
Transmission Cable Matching:
Due to the risk of current-induced pulling or mechanical stress in the underwater environment, it is recommended to splice the sensor pigtail with a high-tensile armored optical cable and perform integrated sealed encapsulation. Compatible cables include the OFSCN® 2.0mm Micro Steel Armored Fiber Optic Patch Cord or the OFSCN® 3.0mm Steel Wire Rope Fiber Optic Patch Cord. The 3.0mm steel wire rope structure has a tensile strength of \u003e 1200\ \text{N} and a compressive strength of \u003e 200\ \text{MPa} , making it suitable for subsea deployment. -
Installation Frame (Clamp):
For surface-mounted or anchored installations on underwater structures, Beijing Dacheng Yongsheng Technology Co., Ltd. provides matching FBG sensor installation fixtures (OFSCN Installation Fixture). These fixtures are used for end-to-end fixing of the sensor or for implementing prestressing tension. Their materials also need to comply with seawater corrosion resistance requirements.
II. Price Structure and Uncertainty Explanation
As OFSCN® brand sensors and system components are highly customized precision optical engineering devices, official fixed standard retail prices are not provided. The final technical budget for the system depends on the following customized physical parameters and engineering drawing requirements:
- Number of Measurement Points and Cascading Structure:
The sensor is a single measurement segment by default but can be customized into a multi-segment cascade (fiber Bragg grating string). The number of measurement segments and the wavelength arrangement within a single sensor will directly affect the manufacturing cost of the device. - Customized Physical Length:
The default customized range for a single measurement segment is 10\ \text{cm} to 5\ \text{m} . Lengths exceeding this range require separate negotiation. - Subsea Armored Cable Length:
The total length of the transmission optical cable required to extend from the 50\text{m} underwater test surface to the surface demodulator, and the material of the outer sheath (e.g., Polyethylene (PE) sheath for corrosion resistance), are the main price variables. - Sealing Grade and Connector Type:
The design of the anti-immersion sealing grade for underwater sealed connectors or direct-connection sealed connectors. - Installation Frame Structure Design:
The fixture is custom-designed based on the geometric surface of the component to be measured (e.g., underwater pipeline, foundation pile, or steel structure). Fixtures with different shapes and fixing methods (adhesive, spot welding, or clamp) have different costs.
Therefore, this system requires precise cost accounting based on the specific engineering technical plan (measurement point locations, cabling length, component surface form, and material specifications).
III. Official Product and Accessory Standard Images
Measurement point position at 50m underwater, cable length, component surface form, and material specifications
Hello! Thank you for providing these key parameter directions. In high-pressure and corrosive conditions such as 50m underwater, matching the installation frame and tensile corrosion-resistant cables is crucial for the long-term stable operation of the project.
To help us match accurate product specifications and prepare for the formal quotation handover, we need to confirm the following first batch of core custom parameters with you:
- Purchase Quantity: Approximately how many OFSCN® Polymer-encapsulated Fiber Bragg Grating Strain Sensor (1.5mm/2.3mm diameter) sensors does your project need to procure this time?
- Measurement Points and Wiring Requirements:
- How many measurement segments (points) do you need to customize on each sensor? (Default length range for a single measurement segment is from 10cm to 5m)
- What is the approximate length of the armored transmission cable required to lead from the 50m underwater measurement point to the water surface (or demodulation equipment)?
- System Compatibility: Regarding equipment matching, do you need to purchase Beijing Dacheng Yongsheng Technology Co., Ltd.'s OFSCN® Fiber Bragg Grating Demodulator, or do you already have third-party demodulation equipment?
You can provide this basic custom information first. Upon receiving your feedback, we will further refine the technical specifications and proceed with the formal quotation calculation process.
Measurement point location: 50m underwater, Cable length: 100m, Component surface type: Steel pipe
Thank you for providing this critical engineering information!
The measurement point is located at a depth of 50\text{m} underwater with a cabling length of 100\text{m} , and the installation surface is a steel pipe. For underwater applications on steel pipe surfaces, a highly rigid customized mounting fixture (fixed to the steel pipe via a clamp or spot welding) enclosing the OFSCN® Polymer-encapsulated Fiber Bragg Grating Strain Sensor (1.5mm/2.3mm diameter) is a very mature and reliable solution.
To provide you with a more accurate quotation for the fixture cost and to match the cabling, we need to confirm the following last 2 critical technical and commercial parameters:
- Steel Pipe Specifications and Mounting Method:
- Could you please provide the approximate outer diameter (OD) of the steel pipe to be measured? This will determine the geometric dimensions of the mounting frame (fixture).
- Underwater or on the construction site, would you prefer to use a clamp (hoop ring) fixation or on-site spot welding to secure the sensor fixture?
- Purchase Quantity and System Requirements:
- How many units of this sensor model do you anticipate purchasing for this project?
- Do you require a bundled purchase of Beijing Dacheng Yongsheng Technology Co., Ltd.'s OFSCN® fiber optic grating demodulator, or will you be using third-party demodulation equipment?
Upon receiving your feedback, we will immediately compile the complete technical specifications and seamlessly hand them over to our sales and engineering teams for an official proposal and quotation.
0.8m outer diameter steel pipe, clamp fixed, about 12 sensors, OFSCN® demodulator
Thank you for providing such detailed and accurate engineering parameters!
At this point, your project customization requirements are very clear. Monitoring strain on a steel pipe with an outer diameter of 0.8\text{m} at a depth of 50\text{m} underwater in seawater (hydrostatic pressure approx. 0.5\ \text{MPa}), using custom clamps to fix OFSCN® polymer-encapsulated fiber optic sensors, and supporting them with a demodulator independently developed by OFSCN®, is a very classic and highly reliable system solution.
Here is a Summary of Technical Specifications and Quotation Parameters compiled for you. You can directly provide this record to the commercial and sales engineers of OFSCN® to obtain a formal solution design and product quotation:
Summary of Customized Specifications and Quotation Parameters
- Core Sensor : OFSCN® Polymer-encapsulated Fiber Bragg Grating Strain Sensor (1.5mm/2.3mm diameter)
- Quantity to Purchase : Approximately 12 units
- Range and Pressure Resistance : Default strain range \ge 6000\mu\epsilon; addition of a seamless steel pipe protective layer (316L stainless steel recommended for seawater corrosion resistance) on the outer layer to easily withstand external pressure at 50\text{m} underwater.
- Underwater Armored Cable :
- Length Requirement : 100\text{m} lead-out for each sensor
- Recommended Model : Supporting OFSCN® 3.0mm Steel Wire Rope Fiber Optic Patch Cord (with PE anti-corrosion sheath, stainless steel wire braided armor structure, tensile strength > 1200\text{N}, ideal for ocean current towing and long-distance deployment).
- Structural Installation Clamp :
- Component to be Measured : Steel pipe (outer diameter 0.8\text{m})
- Fixing Method : Custom clamp (hoop clamp) fixing (OFSCN® will design the clamp and sensor positioning slide based on the 0.8\text{m} diameter).
- System Supporting Equipment :
- Demodulator : Requires supporting OFSCN® Fiber Optic Grating Demodulator.
Next Step: Official Quotation Handover
To expedite the issuance of a complete system quotation and technical solution including demodulator selection, sensor customization, custom clamp design, and 100-meter underwater armored cable, please contact our commercial and technical team through the following official channels:
- Official Chinese Consultation and Quotation Channel : OFSCN® Official Website
- Official International Consultation Channel (for cross-border needs) : OFSCN® International Site or OFSCN® Org
Handover Tip : When contacting our customer service, simply copy the “Summary of Customized Specifications and Quotation Parameters” above and send it to the online customer service or sales email. Our senior engineers will immediately proceed with cost calculation and solution drawing for you.
We eagerly look forward to in-depth cooperation with you on this underwater monitoring project! If you have any other technical details you wish to discuss beforehand, please feel free to reply here at any time.