Seabed Sensor Chamber with Thermal Insulation and Pressure Equalization
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Solution Overview
Problem
Existing sensors for precise seabed measurements are hindered by sensitivity to ambient temperature and pressure, requiring lengthy temperature stabilization and impractical calibration across large ranges, increasing survey costs and time.
Innovation Solution
A device with a chamber containing a sensor and fluid at constant temperature and ambient pressure, equipped with an insulating layer and internal temperature control, eliminating the need for extensive calibration and stabilization, and featuring a means to equalize ambient pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are exposed to ambient temperature and pressure conditions during seabed measurements, then the sensors can operate in realistic environmental conditions, but the sensors require lengthy temperature stabilization periods and extensive calibration procedures
Solution Approach 1:
The device separates the sensor environment from the ambient seabed environment by introducing a temperature-controlled chamber. The sensor operates in a stable thermal environment (constant temperature zone) while the chamber itself experiences ambient pressure and temperature variations outside. This segmentation allows the sensor to maintain accuracy without requiring lengthy stabilization periods in the actual seabed conditions.
2Reliability
If sensors are exposed to ambient temperature and pressure conditions during seabed measurements, then the sensors can operate in realistic environmental conditions, but extensive calibration across large ranges of temperature and pressure is required
Solution Approach 1:
The calibration process is segmented into two independent parts: pressure calibration and temperature calibration. The chamber allows pressure calibration to be performed at constant temperature, eliminating the need for complex multi-dimensional calibration across temperature-pressure ranges. The sensor is calibrated for pressure in the controlled temperature environment, and separately for temperature effects, significantly reducing calibration complexity while maintaining accuracy.
3Productivity
If sensors are moved between different locations on the seabed by surface vessel or subsea vehicle, then measurements can be taken at multiple locations, but temperature stabilization at each location adds hours to the measurement process
Solution Approach 1:
The sensor is pre-conditioned in a temperature-controlled environment before deployment to the seabed. The chamber maintains constant temperature during transport and deployment, so the sensor does not undergo thermal shock when exposed to ambient seabed temperatures. This preliminary thermal conditioning eliminates the need for hours of stabilization time at each measurement location, dramatically increasing productivity.
4Temperature
If active heating or cooling elements are added to the chamber to maintain constant temperature, then temperature stability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The chamber utilizes the ambient seabed environment itself as the temperature control mechanism. By positioning the chamber so that ambient seawater flows over its exterior, the system passively maintains constant temperature through thermal equilibrium with the surrounding water. This self-regulating approach eliminates the need for active heating or cooling elements, reducing device complexity and energy consumption while maintaining excellent temperature stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate seabed measurements without lengthy stabilization and calibration, reducing operation time and costs while maintaining recording accuracy.
Implementation Method 1
The device advantageously further comprises an insulating layer around the chamber. This will protect the internal fluid from rapid temperature changes influenced by the ambient temperature
Implementation Method 2
The internal temperature stabilising device may further comprise a circulating device to ensure even temperature, i.e. a minimal temperature gradient, within the entire chamber
Implementation Method 3
The inlet provides an opening to the ambient pressure and is one way of ensuring that the fluid within the chamber is kept at ambient pressure
Data Source
AI summary
A device (110) for performing measurements on a seabed (3), comprises a chamber (111) containing a sensor (120) and a fluid (115) at a constant temperature and at an ambient pressure. This removes the need for calibration in large ranges of both pressure and temperature. In addition, this eliminates the need to wait until the sensor (120) has achieved ambient temperature, and thereby achieves a desired accuracy of the recordings from the sensor while decreasing the operation time. The device preferably comprises an insulating layer (113), an internal temperature stabilising device (130) and a circulating device (131) to ensure a constant temperature and low temperature gradients within the chamber (111). The pressure within chamber (111) may be equalised to ambient pressure by a pressure inlet (112).