A calibration device for a body temperature monitoring bracelet

Abstract

The utility model discloses a kind of calibration device for body temperature monitoring bracelet, it is related to product calibration technical field, and its technical solution main point is: the inside of the imitation leather layer is equipped with the first probe of detecting the temperature inside imitation leather layer, the inside of the heating matrix is equipped with the second probe of detecting the temperature inside heating matrix, the first probe and the second probe are connected with the temperature control box of outside, effect is through the curvature radius matching human wrist arc of elliptic cylinder heating matrix, eliminate the contact thermal resistance deviation caused by traditional calibration equipment in midair, the double repetition of the thermal conductivity and the flexible deformation characteristics of imitation leather layer, ensure that the degree of fit of equipment sensor and real wear are consistent.

Description

Technical Field

[0001] This utility model relates to the field of product calibration technology, and more specifically, it relates to a calibration device for a body temperature monitoring wristband. Background Technology

[0002] Currently, body temperature monitoring devices mainly fall into three categories: contact point measurement devices, primarily early mercury thermometers and electronic thermometers; non-contact infrared devices, such as forehead thermometers and ear thermometers, which achieve rapid screening through infrared sensing; and wearable continuous monitoring devices, such as smart bracelets / watches that integrate thermal sensors and support long-term body temperature monitoring. However, due to environmental influences, wearing methods, individual differences, and limitations in sensing technology and algorithms, the errors are relatively large.

[0003] When calibrating body temperature monitoring equipment, for contact-type point measurement devices, the thermometer probe is typically placed in a constant-temperature medium (such as a water bath or metal block), and the displayed value is compared with the standard temperature value. For non-contact devices, a blackbody furnace is typically used to simulate human infrared radiation, and a reference temperature value is provided by temperature control using a standard platinum resistance thermometer.

[0004] When calibrating the body temperature monitoring function of smart bracelets / watches, traditional calibration equipment cannot simulate the contact characteristics of human skin and is not suitable for wrist-worn devices. Existing contact-type body temperature devices (such as electronic thermometers) primarily rely on constant-temperature water baths or metal thermostats as the reference heat source for calibration. While these devices achieve a stable temperature field through liquid media or metal homogenization, ensuring high accuracy, they present the following problems for calibrating wearable continuous monitoring devices:

[0005] 1. The water tank needs to be equipped with a circulating pump, a high-precision platinum resistance thermometer, and a constant temperature controller; the system volume often exceeds 0.5m². 3 It is only applicable to fixed laboratory settings;

[0006] 2. Distortion in thermal simulation: The rigid plane of the water tank / metal block cannot simulate the flexible contact state of human skin and cannot reproduce the curvature of the wrist. Using a laboratory-grade blackbody radiation source as a standard heat source also has similar problems. The equipment is expensive and cannot simulate the contact measurement state between the wristband / watch and the skin.

[0007] Traditional calibration scenarios differ significantly from the actual measurement conditions required by smart bracelets / watches, resulting in unreliable calibration results. Smart bracelets / watches measure body temperature through contact sensors, and there is currently a lack of dedicated calibration equipment that mimics the human body environment for such products.

[0008] Therefore, in order to solve the above-mentioned technical problems, this application proposes a calibration device for a body temperature monitoring wristband. Utility Model Content

[0009] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a calibration device for a body temperature monitoring wristband.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a calibration device for a body temperature monitoring wristband, comprising:

[0011] A heating substrate, wherein a heating device is disposed within the heating substrate;

[0012] A simulated skin layer is disposed on the surface of the heating substrate;

[0013] The first probe is positioned inside the pseudo-dermis layer;

[0014] A second probe is positioned inside the heating substrate;

[0015] A temperature control box connected to the heating device, the first probe, and the second probe;

[0016] The temperature control box displays the first and second probes, which detect the first and second temperatures used to calibrate the wristband's temperature.

[0017] Preferably, the heating device is a heating tube, which is embedded in a pre-drilled heating hole inside the heating substrate, and the temperature control box outputs a control signal to control the heating power of the heating tube.

[0018] Preferably, the heating substrate is shaped like a human arm, with a skin-like layer attached to and covering the surface of the heating substrate.

[0019] Preferably, the heating substrate has a second embedding hole inside, and the second probe is disposed inside the second embedding hole; the imitation skin layer has a first embedding hole inside, and the first probe is disposed inside the first embedding hole.

[0020] Preferably, the temperature control box is connected to the receiving ends of the first and second probes via wires, and the temperature control box is connected to the terminals of the heating tube via wires.

[0021] Preferably, the temperature control box includes a display screen unit, control input keys, a microcomputer system, a sensor interface, and a heating load interface.

[0022] Preferably, the first probe is a platinum resistance temperature sensor.

[0023] Preferably, the second probe is a platinum resistance temperature sensor.

[0024] Preferably, the heating substrate is made of aluminum alloy with a thermal conductivity ≥150W / (m·K), and the heating tube is made of a metal material with high thermal conductivity.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In this invention, the curvature radius of the elliptical cylindrical heating substrate is matched with the curvature of the human wrist, eliminating the contact thermal resistance deviation caused by the device being suspended in the air in traditional calibration, so that the device under test presents a physical form that is actually worn; this device makes the calibration scenario highly consistent with the actual use scenario, and solves the dilemma mentioned in the background art of the lack of dedicated standard calibration equipment for wearable body temperature devices. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 This is an exploded view of some structures in this utility model;

[0031] Figure 4 for Figure 3 Enlarged diagram of point B in the middle.

[0032] 1. Heating substrate; 2. Imitation skin layer; 3. First probe; 4. Second probe; 5. Heating tube; 6. First embedding hole; 7. Second embedding hole; 8. Heating reserved hole; 9. Temperature control box. Detailed Implementation

[0033] like Figures 1-4 As shown, this utility model provides a calibration device for a body temperature monitoring wristband, comprising:

[0034] Heating substrate 1, which contains a heating device to simulate the internal temperature of the human body, is an elliptical cylinder;

[0035] It should be noted that, in the embodiment, the heating substrate 1 is shaped like a human arm, and the imitation skin layer 2 is attached to and covers the surface of the heating substrate 1. At the same time, the heating substrate 1 has an elliptical cross-section, with a major axis length of 5-7cm, a minor axis length of 4-5cm, a major-to-minor axis ratio of 1.1-1.5, and a column length of 5-10cm. The material of the heating substrate 1 is an aluminum alloy with a thermal conductivity ≥150W / (m·K).

[0036] The simulated skin layer 2, which is set on the surface of the heating substrate 1, is used to simulate the temperature of the human body surface;

[0037] It should be noted that, in the embodiment, the outer surface of the heating substrate 1 is covered with a 3.0 mm thick imitation skin layer 2, which is made by heat-curing silicone molding. Its heat transfer coefficient is about 23.84 W / (m2·K) and its elastic modulus is about 0.83 MPa, which is used to reproduce the heat transfer characteristics and flexibility characteristics of human skin.

[0038] The first probe 3 is positioned inside the pseudo-dermis layer 2;

[0039] A second probe 4 is disposed inside the heating substrate 1;

[0040] Temperature control box 9 is connected to the elliptical cylindrical heating device, the first probe 3 and the second probe 4;

[0041] Among them, the temperature control box 9 shows that the first probe 3 and the second probe 4 of the elliptical cylinder detect the first temperature and the second temperature used to calibrate the wristband temperature.

[0042] It should be noted that the temperature control box 9 includes a display screen unit, control input keys, a microcomputer system, a sensor interface, and a heating load interface (existing technology, which will not be described in detail here). Its main function is to control the heating temperature of the heating load, ensure that the temperature of the heating tube 5 is stable within the set value range, and display the measured values ​​of the temperature sensors of the first probe 3 and the second probe 4 and input the set heating temperature.

[0043] The heating substrate 1 has a second embedding hole 7 inside, and a second probe 4 is disposed inside the second embedding hole 7. The second probe 4 is a platinum resistance temperature sensor with a measurement accuracy better than ±0.3℃. It is embedded inside the heating substrate 1 through the second embedding hole 7. The imitation skin layer 2 has a first embedding hole 6 inside, and a first probe 3 is disposed inside the first embedding hole 6. The first probe 3 is a platinum resistance temperature sensor with a measurement accuracy better than ±0.3℃. It is embedded inside the imitation skin layer 2 through the first embedding hole 6.

[0044] In this embodiment, the second probe 4 is implanted 2 cm deep into the center of the heated substrate and fixed by epoxy resin encapsulation. It monitors the substrate temperature in real time and displays the temperature control feedback signal on the display screen of the temperature control box 9. The first probe 3 is implanted 1 mm below the pseudo-skin layer 2 (from the outer surface) through a hollow needle tube. The probe tip has a diameter of 1 mm and is used to directly capture the equivalent temperature of the body surface.

[0045] The elliptical cylinder heating device is a heating tube 5, which is embedded in a pre-drilled heating hole 8 inside the elliptical cylinder heating base 1. The elliptical cylinder temperature control box 9 outputs a control signal to control the heating power of the heating tube 8. The heating tube 5 is made of a metal material with high thermal conductivity. The temperature control box 9 is connected to the terminal of the heating tube 5 through a wire.

[0046] The core of the temperature control box 9 uses a single-chip microcomputer to operate the temperature control (existing technology, which will not be elaborated here). The temperature control box 9 is connected to control the heating tube 5 to generate constant heat, thereby generating a uniform and stable heat source. This heat source is used to simulate the core heat source of the human body. The heat of the core heat source is conducted to the simulated skin surface through the simulated skin layer 2, so that the surface temperature change reflects the internal core temperature change. This surface temperature is used to simulate the human body surface temperature.

[0047] During calibration, the wristband to be calibrated is worn and fixed on the heating substrate 1, which is covered with a simulated skin-like layer 2. The temperature control program is then activated: the second probe 4 monitors the temperature T. core (Simulating internal body temperature); The PID system regulates the heating power of the heating element to make T core The temperature is gradually increased to the target set value (30℃, 37℃, or 40℃) as needed.

[0048] The second probe 4 inside the heating substrate 1 monitors the temperature T. core Temperature T of the first probe 3 inside the pseudo-dermis 2 skin After the values ​​stabilized, the temperature T was simultaneously collected by the second probe 4 inside the heating substrate 1. core (Simulated body temperature), temperature T of the first probe 3 within the simulated skin layer 2 skin (Body surface baseline value), measured and displayed value T by the device under test device .

[0049] Calculation error: ΔT dc =T device -T core ;ΔT ds =T device -T skin

[0050] All the data obtained are displayed on the display screen of the temperature control box 9. The calculation is simple and intuitive. The actual error between the displayed value of the wristband and the test device and the actual simulated human body temperature and the actual simulated human body surface temperature can be obtained through calculation. The subsequent adjustment is made according to the rated error value specified by the wristband and other calibration devices.

[0051] In summary, by matching the radius of curvature of the elliptical cylindrical heating substrate 1 to the curvature of the human wrist, the contact thermal resistance deviation caused by the device being suspended in the air in traditional calibration is eliminated, allowing the device under test to present a physical form that is actually worn. The standard temperature first probe 3 embedded under the simulated skin layer 2 directly monitors the "body surface equivalent temperature", ensuring that the temperature sensed by the device under test and the reference temperature are from the same source, at the same point, and at the same time. This device makes the calibration scenario highly consistent with the actual use scenario, solving the dilemma mentioned in the background technology of the lack of dedicated standard calibration equipment for wearable body temperature devices.

[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A calibration device for a body temperature monitoring wristband, characterized in that, include: Heating substrate (1), wherein a heating device is provided inside the heating substrate (1); A simulated skin layer (2) is disposed on the surface of the heating substrate (1); The first probe (3) is set inside the pseudo-dermis (2); A second probe (4) is disposed inside the heating substrate (1); Temperature control box (9) connected to the heating device, the first probe (3) and the second probe (4); The temperature control box (9) displays the first temperature and the second temperature detected by the first probe (3) and the second probe (4) for calibrating the wristband temperature.

2. The calibration device for a body temperature monitoring wristband according to claim 1, characterized in that: The heating device is a heating tube (5), which is embedded in a pre-drilled heating hole (8) inside the heating substrate (1). The temperature control box (9) outputs a control signal to control the heating power of the heating tube (5).

3. The calibration device for a body temperature monitoring wristband according to claim 1, characterized in that: The heating substrate (1) is shaped like a human arm, and the imitation skin layer (2) is attached to and covers the surface of the heating substrate (1).

4. The calibration device for a body temperature monitoring wristband according to claim 3, characterized in that: The heating substrate (1) has a second embedding hole (7) inside, and the second probe (4) is disposed inside the second embedding hole (7). The imitation skin layer (2) has a first embedding hole (6) inside, and the first probe (3) is disposed inside the first embedding hole (6).

5. A calibration device for a body temperature monitoring wristband according to claim 4, characterized in that: The temperature control box (9) is connected to the receiving ends of the first probe (3) and the second probe (4) via wires, and the temperature control box (9) is connected to the terminal block of the heating tube (5) via wires.

6. A calibration device for a body temperature monitoring wristband according to claim 5, characterized in that: The temperature control box (9) includes a display screen unit, control input keys, a microcomputer system, a sensor interface, and a heating load interface.

7. A calibration device for a body temperature monitoring wristband according to claim 5, characterized in that: The first probe (3) is a platinum resistance temperature sensor.

8. A calibration device for a body temperature monitoring wristband according to claim 5, characterized in that: The second probe (4) is a platinum resistance temperature sensor.

9. A calibration device for a body temperature monitoring wristband according to claim 4, characterized in that: The material of the heating substrate (1) is an aluminum alloy with a thermal conductivity ≥150 W / (m·K).

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