Temperature sensing patch is a temperature monitoring tool that can sense temperature changes and provide visual feedback. It is usually made of thermosensitive materials, and when the temperature changes, the color of the patch will change, thus displaying the temperature change. It has the advantages of simplicity, intuitiveness, no battery, and no need for external power supply, and is therefore widely used in multiple fields such as medical, industrial, and consumer electronics.

1、 Working principle

　　Temperature sensitive patchThe working principle is based on the response of thermosensitive materials to temperature changes. When the temperature rises or falls, the physical or chemical properties of thermosensitive materials change, which is usually manifested as a change in color.

1. Liquid crystal material: using liquid crystal material. These liquid crystal molecules will arrange into different forms at specific temperatures, and the arrangement structure of liquid crystals is directly related to the wavelength of light they reflect or refract. Therefore, liquid crystal materials can exhibit different colors at different temperatures. When the temperature changes, the arrangement of liquid crystal molecules will change, and the color of reflected or refracted light will also change, producing a visual temperature indication.

2. Thermochromic materials: Another commonly used type of thermosensitive material is thermochromic materials. These materials undergo changes in molecular structure due to temperature fluctuations, which in turn cause changes in color. For example, certain special polymers or metal oxide materials can change the wavelength of light they absorb and reflect when the temperature changes, causing the color of the patch to change and indicating the temperature.

2、 Application scenarios

1. Medical field: Temperature sensitive patches have a wide range of applications in the medical field. One common application is for temperature monitoring. Parents often use it to quickly understand temperature changes when children and infants have a fever. Usually pasted on the patient's forehead or other parts, it can reflect the real-time increase or decrease of body temperature and provide intuitive temperature information.

2. Electronic devices: They also have certain applications in consumer electronics. For example, the casing of devices such as smartphones, tablets, and laptops can be covered with stickers, and when the device overheats, the color change can remind users to take cooling measures. In addition, it can also be used to monitor the operating temperature of electronic components, thereby avoiding overheating damage.

3. Industrial and mechanical equipment: In the monitoring of industrial and mechanical equipment, it is used to detect the temperature status of the equipment. Industrial equipment such as engines, electrical equipment, boilers, and pipelines may malfunction due to overheating during operation. Providing intuitive temperature feedback can help operators detect problems in a timely manner and perform maintenance.

As a simple and intuitive temperature monitoring tool, temperature sensing patches play an important role in multiple fields. It utilizes the physical changes of thermosensitive materials to reflect temperature changes in real-time and without power, and is widely used in industries such as healthcare, electronics, industry, transportation, and food.