Modularized whole-space-domain and whole-time-domain temperature and strain measuring device

Abstract

The invention discloses a modularized whole-airspace and whole-time-domain temperature and strain measuring device, which relates to the technical field of heat transfer, computers, material science and communication, and comprises a modularized temperature and strain measuring device, a signal generating device, a signal receiving device and a visualization device, the modular temperature and strain measurement device can be arranged on the surface or in a detected object, is used for measuring the temperature and strain values of the detected object, and comprises an isolation protection layer which is used for protecting an internal sensor; an optical signal emitted by the signal generating device is transmitted to the modularized temperature and strain measuring device through the transmission line, and the optical signal shifts in the transmission process under the action of the temperature and the strain of a detected object; and the signal receiving device receives the shifted optical signal and sends the optical signal to the visualization device for display. According to the invention, the protection of the optical fiber sensor is realized through the arrangement of the isolation protection layer, and the modular integration of the sensor is realized through the modular temperature and strain measurement device.

Description

Technical Field

[0001] The present invention relates to the fields of heat transfer, computer, material science and communication technology, and more particularly to a modular full-space and full-time temperature and strain measurement device. Background Art

[0002] Currently, furnaces in the metallurgical industry, reactors in the chemical industry, and large-scale mechanical equipment in other industries face a common challenge: real-time monitoring of temperature and operating conditions (such as vibration and internal strain). This is especially true when measuring temperature and strain across large spaces or surfaces. Because the uniformity of the temperature and stress fields in furnaces or reactors significantly impacts the uniformity of internal reactions and the safety and stability of the equipment, existing temperature and strain measurement devices primarily rely on single thermocouple point measurements and strain measurement using strain gauge sensors, piezoelectric sensors, vacuum contrast monitoring sensors, intelligent coating sensors, and acoustic emission sensors. These devices are unable to accurately measure temperature and strain over large areas under multi-physics conditions. Therefore, developing technologies and devices that can achieve real-time, accurate temperature and strain measurement over large areas under multi-physics coupling conditions is key to solving this problem. Conventional fiber optic temperature sensors typically use a single optical fiber wrapped around the surface of the area to be measured. Damage to any point renders the entire fiber optic sensor useless.

[0003] Therefore, how to solve the problem that a single optical fiber sensor is easily damaged and fails during the measurement process is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a modular full-space and full-time temperature and strain measurement device to solve the problems existing in the background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A modular full-space and full-time temperature and strain measurement device comprises: a modular temperature and strain measurement device, a signal generating device, a signal receiving device, and a visualization device. The modular temperature and strain measurement device is used to measure the temperature and strain values of a detected object and includes an insulating protective layer for protecting an internal sensor. The signal generating device emits an optical signal which is transmitted via a transmission line to the modular temperature and strain measurement device. The optical signal deviates during transmission under the influence of the temperature and strain of the detected object. The signal receiving device receives the deviated optical signal and sends it to the visualization device.

[0007] Preferably, the insulating protective layer includes a protective layer, a supporting layer, a buffer layer, an insulating layer / heat conduction layer, a sensor arrangement layer, and a sensor fixing device, which are arranged in sequence from the outside to the inside, and each layer is connected through an interface. The sensor arrangement layer includes a temperature sensor and a strain sensor.

[0008] Preferably, the support layer is made of any one of a metal material, a non-metal material or a composite material, and is in a plate-like or mesh-like structure.

[0009] Preferably, the buffer layer is made of elastic material or non-elastic material, wherein the elastic material is rubber or spring, and the non-elastic material is foam or aerogel material.

[0010] Preferably, the heat insulating layer isolates the influence of external temperature on the detection process of the temperature sensor, and the heat conducting layer serves as a transition layer between the surface of the detected object and the temperature and strain sensors when the surface of the detected object is uneven.

[0011] Preferably, the temperature sensor includes optical type and thermocouple type, and the strain sensor adopts FBG strain temperature compensation and acceleration sensor, with a temperature measurement range of -197°C-1800°C, a strain measurement range of ±1500με, and an acceleration measurement range of 0.5-120Hz.

[0012] Preferably, the optical temperature sensor uses optical fibers made of different materials for distributed optical fiber temperature measurement or optical fiber Bragg grating temperature measurement; the arrangement form of the temperature sensor and strain sensor on the arrangement layer adopts any of the aforementioned forms such as spiral, annular, S-shaped, in-line, and longitude and latitude according to the detection needs.

[0013] As can be seen from the above technical solution, compared with existing technologies, the present invention provides a modular full-space and full-time temperature and strain measurement device with a temperature measurement range of -197°C to 1800°C, meeting the needs of various industrial scenarios from low to high temperatures and comprehensively capturing the operating parameters of the equipment. By detecting the optical signal offset to obtain temperature and strain information, it enables real-time, high-precision, rapid measurement and display, promptly reflecting temperature and strain changes in the measured surface area, and providing an accurate basis for real-time equipment control. The modular temperature and strain measurement element includes multiple functional layers, such as a protective layer, a buffer layer, and a thermal insulation layer. The buffer layer reduces damage to the sensor from external impacts, while the thermal insulation layer isolates external temperature interference. The materials and structures of each layer can be flexibly adjusted to suit different operating conditions, enhancing the device's adaptability to complex environments. The measurement element layers are equipped with docking interfaces, and the structure can be customized to suit the device being measured, facilitating rapid deployment and disassembly. If a portion of the fiber optic sensor is damaged, only the corresponding module needs to be replaced, without replacing the entire sensor, reducing maintenance costs and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0015] Figure 1 A schematic structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the insulating protective layer provided by the present invention. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] The embodiment of the present invention discloses a modular full-space and full-time temperature and strain measurement device, such as Figure 1 As shown, it includes: a modular temperature and strain measuring device, a signal generating device, a signal receiving device, and a visualization device. The modular temperature and strain measuring device is set on the surface or inside of the object to be detected, and is used to measure the temperature and strain value of the object to be detected. It includes an insulating protective layer, and the insulating protective layer is used to protect the internal sensor; the signal generating device sends an optical signal that is transmitted to the modular temperature and strain measuring device via a transmission line. The optical signal is offset during the transmission process under the action of the object to be detected; the signal receiving device receives the offset optical signal and sends it to the visualization device for processing and display.

[0019] The offset or changed optical signal is returned to the signal receiving device through the transmission line for real-time processing. By detecting the offset of the signal, the surface temperature and strain distribution of the measured object can be obtained. The temperature measurement range covers -197℃-1800℃, the strain measurement range is ±1500με, and the acceleration measurement range is 0.5-120Hz.

[0020] In a specific embodiment, Figure 2As shown, the isolation protection layer includes a protective layer, a support layer, a buffer layer, a thermal insulation layer / heat conduction layer, a sensor placement layer, and a sensor fixture, arranged in order from the outside in. Each layer is connected via interfaces. The sensor placement layer includes temperature sensors and strain sensors, and can also be a combination of one or more of the aforementioned. If the device or location being detected is located in an area with frequent vibration, the sensor fixture layer in the structure that is adjacent to the detection area needs to be replaced with a material that can withstand frequent or periodic vibration conditions to prevent signal distortion caused by false contact between the sensor and the detection area.

[0021] In a specific embodiment, the support layer is any one of a metal material, a non-metal material or a composite material, and is preferably in the form of a plate or a mesh or other support types with higher strength.

[0022] In a specific embodiment, the buffer layer is an elastic material or a non-elastic material. The function of the buffer layer is mainly to reduce the damage to the temperature and strain sensors caused by the supporting layer when it is subjected to external impact. The elastic material is rubber or spring, and the non-elastic material is foam or aerogel material, but it cannot be corrosive. At the same time, the stable working temperature must be higher than the surface being detected.

[0023] In one specific embodiment, the thermal insulation layer isolates the impact of external temperature on the temperature sensor's detection process, isolating both high and low temperatures. Materials that can be used include, but are not limited to, high- or low-temperature resistant coatings, refractory fiber cloth, ceramic fiber, rock wool, glass wool, aerogel materials, etc. The specific type, thickness, and area used are adjusted according to the actual temperature of use. When the surface of the object being detected is uneven, the thermal conductivity layer serves as a transition layer between the surface of the object being detected and the temperature and strain sensors. The thermal conductivity layer is a high thermal conductivity material, and metal foil, metal powder coating, or other materials with good thermal conductivity and plasticity can be selected. However, it must not be corrosive, and its stable operating temperature must be higher than the surface being detected. When the temperature of the device being detected falls within the low or extremely low temperature range, a separate thermal insulation layer must be included in the structure to prevent external air or heat sources from interfering with the temperature and strain measurement sensors. At the same time, the contact fixing layer in the module that contacts the detection area must also be replaced with a material that can adapt to low-temperature operating conditions. When the temperature of the device being tested falls within the high temperature range, the insulating layer in the structure needs to be replaced with a thermally conductive layer with good thermal conductivity to prevent the heat in the tested area from being effectively conducted away, thereby interfering with the temperature and strain measurement sensors. At the same time, the contact fixing layer in the module that is in contact with the detection area also needs to be replaced with a material that can adapt to working under high temperature conditions.

[0024] In a specific embodiment, the temperature sensor includes but is not limited to optical type, thermocouple type, and other measuring sensors that can be converted into temperature signals. The strain sensor uses FBG strain temperature compensation and acceleration sensor. The temperature measurement range covers -197℃-1800℃, the strain measurement range is ±1500με, and the acceleration measurement range is 0.5-120Hz. Different temperature measurement structures and temperature measurement modules are used according to the different detection positions.

[0025] In one specific embodiment, optical temperature sensors utilize optical fibers made of various materials, such as common quartz fiber, fluoride fiber, and sapphire fiber. They can employ either distributed fiber temperature measurement (DTS) or fiber Bragg grating (FBG) temperature measurement. DTS is used for larger measurement areas with lower accuracy and speed requirements, while FBG is used for smaller measurement areas with higher accuracy and speed requirements. The fiber optic temperature sensors and strain sensors can be arranged on the layout layer in various configurations, including spiral, annular, S-shaped, inline, and latitude / longitude configurations, depending on the detection requirements, but must cover the detection area.

[0026] The core formula of distributed optical fiber sensing measurement is:

[0027]

[0028] Among them, I AS is the intensity of anti-Stokes light in stimulated Raman scattering, I S is the intensity of Stokes light, λ S is the wavelength of Stokes light, λ AS is the wavelength of anti-Stokes light, h is Planck constant, h=6.626×10 -34 J·s, c is the speed of light in vacuum, Δν is the Raman frequency shift, which reflects the characteristic frequency difference of the molecular vibration energy level, k B is the Boltzmann constant, k B =1.38×10 -23 J / K, T is the absolute temperature, the unit is Kelvin.

[0029] The core measurement formula of fiber Bragg grating sensor:

[0030] Δλ B =λ B ·(α+ξ)·ΔT;

[0031] Where Δλ B is the center wavelength drift of the fiber Bragg grating, λ B is the initial center wavelength of the fiber Bragg grating, α is the thermal expansion coefficient of the fiber material, ξ is the thermo-optic coefficient of the fiber material, and ΔT is the temperature change.

[0032] When the working area of the device being tested is susceptible to external interference, impact, or damage, the supporting layer in the structure needs to be replaced with a high-strength material that can withstand external impact. At the same time, the internal buffer layer must be able to promptly disperse the external impact load to prevent it from drying out or even damaging the internal strain sensor. At the same time, the contact fixing layer with the detection area is also replaced with a material that can withstand these working conditions to prevent signal distortion caused by poor contact between the sensor and the detection area.

[0033] The following will describe the system in detail with some specific application examples.

[0034] Example 1:

[0035] This measurement module and system are used to detect low-temperature liquid storage tanks. The measurement module is composed of a buffer layer, an insulation layer (aerogel is used this time), a temperature and strain sensor layout layer, and a contact and fixed layer of the measured area (magnetic adsorption material is used to closely contact the measured area with no gap in the middle). The entire measurement module is arranged inside the insulation layer of the storage tank and is isolated from the outside world by the insulation layer of the storage tank, ensuring that the temperature of the detection area is the actual temperature and strain inside the tank. The lowest detection temperature is -197°C, and the optical fiber made of fluoride material is used as the sensor.

[0036] Example 2:

[0037] The measurement module and system are used to detect the temperature and strain of the cement rotary kiln. The measurement module is composed of a support layer, a buffer layer (a material with good thermal conductivity), a heat conduction layer (a metal sheet), a temperature and strain sensor layout layer (a metal mesh is used as the layout layer) and a tightening device from the outside to the inside. The entire measurement module is tightly fitted on the surface of the cement rotary kiln. Through the temperature and strain sensors, the actual temperature and strain of the kiln body in the circumference and length directions are detected in real time. The maximum detection temperature is usually set to 900°C. The optical fiber made of silicon material is used as the temperature and strain sensor. By detecting the temperature, strain and vibration changes, the length and radial temperature distribution of the rotary kiln, the ring thickness and the material operation status can be known.

[0038] Example 3:

[0039] This measurement module and system are used to perform full-area temperature and strain detection on chemical reaction towers or blast furnaces. The measurement module is composed of a support layer, a buffer layer, a heat conduction layer (metal foil), a temperature and strain sensor layout layer (a metal mesh is used as the layout layer), and a tightening device from the outside to the inside. The entire measurement module is tightly fitted on the surface between the lining and the cooling wall in the reaction tower or blast furnace. Through temperature and strain sensors, the actual temperature and strain in the circumference and height directions of the reaction tower or blast furnace are detected in real time. The maximum detection temperature is usually set to 900°C. The optical fiber made of silicon material is used as a temperature and strain sensor. By detecting temperature, strain and vibration changes, the height and radial temperature distribution of the reaction tower or blast furnace, the liquid flow in the tower or furnace, and whether there is adhesion to the inner wall of the tower can be obtained, providing judgment for the stable operation of the reaction tower or blast furnace.

[0040] Example 4:

[0041] This measurement module and system are used to monitor the working status of the bucket reclaimer used in the port. The measurement module is composed of a support layer, a buffer layer, a temperature and strain sensor layout layer (using a metal mesh as the layout layer) and a sensor fixing device from the outside to the inside. The entire measurement module is tightly fitted on the surface of the reclaimer that is subjected to greater force and vibration. Through temperature and strain sensors, the actual temperature and strain of the measured area are detected in real time. The maximum detection temperature is usually set at 150°C. The optical fiber made of silicon material is used as a temperature and strain sensor. By detecting changes in temperature, strain and vibration, the vibration and strain distribution of key parts of the reclaimer can be obtained, providing a judgment on the stable operation of the reclaimer.

[0042] The present invention realizes protection of the optical fiber sensor by providing an insulating protective layer, and realizes sensor integration by using a modular temperature and strain measuring device.

[0043] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0044] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A modular full-space and full-time temperature and strain measurement device, characterized in that: include: A modular temperature and strain measurement device, a signal generating device, a signal receiving device, and a visualization device. The modular temperature and strain measurement device is used to measure the temperature and strain of the object being detected, and includes an insulating protective layer for protecting the internal sensor. The signal generating device emits an optical signal that is transmitted via a transmission line to the modular temperature and strain measurement device. The optical signal is deflected during transmission under the influence of the temperature and strain of the object being detected. The signal receiving device receives the shifted optical signal and sends it to the visualization device.

2. A modular full-space and full-time temperature and strain measurement device according to claim 1, characterized in that: The insulating protective layer includes a protective layer, a supporting layer, a buffer layer, an insulating layer / heat conduction layer, a sensor arrangement layer, and a sensor fixing device, which are arranged in sequence from the outside to the inside. The layers are connected through interfaces. The sensor arrangement layer includes a temperature sensor and a strain sensor.

3. A modular full-space and full-time temperature and strain measurement device according to claim 2, characterized in that: The support layer is made of any one of metal, non-metal or composite materials, and is in the form of a plate or a mesh.

4. A modular full-space and full-time temperature and strain measurement device according to claim 2, characterized in that: The buffer layer is made of elastic material or non-elastic material, wherein the elastic material is rubber or spring, and the non-elastic material is foam or aerogel material.

5. A modular full-space and full-time temperature and strain measurement device according to claim 2, characterized in that: The heat insulating layer isolates the influence of external temperature on the detection process of the temperature sensor. When the surface of the detected object is uneven, the heat conducting layer serves as a transition layer between the surface of the detected object and the temperature and strain sensors.

6. A modular full-space and full-time temperature and strain measurement device according to claim 2, characterized in that: The temperature sensor includes optical type and thermocouple type. The strain sensor adopts FBG strain temperature compensation and acceleration sensor. The temperature measurement range covers -197℃-1800℃, the strain measurement range is ±1500με, and the acceleration measurement range is 0.5-120Hz.

7. A modular full-space and full-time temperature and strain measurement device according to claim 6, characterized in that: Optical temperature sensors use optical fibers made of different materials for distributed optical fiber temperature measurement or fiber Bragg grating temperature measurement; the layout of temperature sensors and strain sensors on the layout layer can be spiral, ring, S-shaped, inline, longitude and latitude according to detection needs.

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