Automobiles have become more and more popular in people's lives. Many of the daily accidents are related to the performance of the car, such as the performance of brake pads. How can we know the performance of the current brake pads? The infrared camera is used, and it can completely know the whole temperature change process. The article introduces the application of infrared camera in this aspect and how to do infrared detection
Overview
The quality of the brake pads is directly related to the effectiveness and reliability of the car parking process or emergency braking process, and has a direct impact on the lives of drivers and passengers. The thermal imager can fully know the temperature change process of the entire brake pad after working, so as to check the braking performance and wear resistance of the brake pad.
Why monitor the temperature of the brake pads?
The high-performance braking capability comes from the perfect braking system. Automotive brake systems generally include brake pedals, hydraulic circuits, calipers, brake pads and brake discs. When the driver depresses the pedal, the hydraulic circuit exerts force on the calipers equipped with brake pads. The calipers close and hold the brake disc in the wheel to achieve deceleration. For brake pads, the most important thing is the choice of friction materials, which basically determines the braking performance of the brake pads.
Temperature is an important environmental variable that affects the performance of brake pads. On the one hand, temperature restricts the performance of brake pads in terms of braking performance and wear resistance. On the other hand, it also reflects the braking performance and wear resistance of the brake. Therefore, temperature collection is crucial in the study of brake pad materials.
Application of Infrared Thermal Imager in Brake Pad Temperature Detection
If the brake pad temperature is too high, its efficiency will be reduced. During sudden braking, the strong friction will cause the temperature of the brake disc and brake pad to reach 1000 ℃! If the friction material is too hard, it will cause the brake disc to wear faster. During emergency braking, the brake pad may crack or fall off, which eventually leads to The brakes are malfunctioning.
Using a thermal imager, engineers can fully know the temperature change trend of the entire brake pad and brake system. According to this temperature change trend, the brake condition of the brake pads and wear resistance can be analyzed.
If the friction material of the brake pads is too soft, the brake pad temperature will rise sharply after continuous braking, and the braking force will obviously decrease. On the contrary, if the friction material is too hard and the temperature change trend is slow, it will cause the brake pad brake disc to wear faster. It may also cause the brake friction pad to crack or fall off during emergency braking, which eventually leads to brake failure.
Unique advantages of temperature detection of infrared camera
There are three methods of temperature measurement:
1. Contact thermocouple
The reaction speed of the contact thermocouple is slow, and the overall temperature distribution of the entire brake pad cannot be displayed. At the same time, the operation is too complicated, and the efficiency of the engineer is difficult to improve.
2. Infrared spot temperature instrument
The infrared spot thermometer has a fast response and non-contact temperature measurement, but the infrared spot thermometer also does not have the function of temperature distribution of the entire brake pad.
3. Infrared camera
Infrared thermal imaging cameras make up for the shortcomings of contact thermocouples and infrared spot thermometers. They are simple in operation, fast in response, non-contact temperature measurement, and can reflect the temperature distribution of brake pads. They are currently the most ideal detection tools.
to sum up
What problems might you encounter when shooting with an infrared camera?
1. After the brake pads work, the temperature is relatively high (greater than 600 ℃), you need to pay attention to the temperature measurement range when using the thermal imager;
2. When the surface is relatively bright, it is very easy to reflect the nearby high-temperature radiation source into the infrared camera, causing serious interference. When shooting, pay attention to avoid nearby high-radiation objects.
How to do infrared thermal image detection?
1. Select a suitable temperature measurement range, which should be able to detect high temperature of 1200 ℃;
2. Use the automatic mode to measure the temperature range first; then set the horizontal span manually to set the temperature range to the minimum and include the previously measured temperature range;
3. Switch the mode of each palette to make the thermal image display effect the best (it is recommended to use high contrast or iron red mode).
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