Introduction to the Application of Infrared Thermometer in Steel Rolling Production
1. Preface
In the modern steel rolling production process, in order to ensure the physical quality of steel plates and to control rolling and cooling, certain temperature measurement and detection methods are required. The high accuracy and strong reliability of infrared thermometers can provide effective, accurate, and reliable temperature measurement for steel plates, thereby improving product quality, reducing consumption, and improving productivity.
2. Composition of infrared thermometer
Infrared thermometer, also known as infrared radiation thermometer, determines the temperature of the object being measured by measuring its electromagnetic radiation, which comes from the energy contained inside the object. For industrial applications, we are concerned with extending the shorter wavelength of visible light to infrared light up to 20 μ Infrared radiation of m. Therefore, an infrared thermometer (radiation thermometer) is a device that quantifies radiation energy and expresses its corresponding temperature using electrical signals.
Infrared thermometer can generally be divided into four parts: optical system, infrared detector, signal processing part, and display output part.
2.1 Optical system
The optical system is an important component of an infrared thermometer, mainly used for gathering radiation energy, aiming the measured target, determining the field of view of the thermometer, and also providing a certain sealing effect on the interior of the thermometer.
2.2 Infrared detectors
The infrared detector is the core part of the infrared thermometer. The infrared detector receives the radiation energy of the measured object through the objective lens, converts the radiation energy into electrical signals, and finally obtains the surface temperature of the measured object through subsequent processing.
2.3 Signal processing
The infrared detector converts infrared radiation into electrical signals, which are sent to the signal processing section. After being preamplified and A/D converted, the signal is input to the microprocessor. At the same time, the environmental temperature compensation signal is also input to the microprocessor. After linearization processing by the microprocessor, the corrected output signal is obtained after environmental compensation and radiation rate correction.
2.4 Display Output
In practical applications, the temperature signal provided by the processor is used in two ways: one is displayed through a display; Another method is to transmit temperature signals to industrial control systems to control the production process, and there are also two methods used simultaneously.
Different types of temperature detectors can provide real-time display of values, maximum values, minimum values, average values, and differences. They can also display radiation rate settings, alarm settings, etc. After software processing, they can also display temperature curves, heat maps, etc. Thermometers are commonly used for 0-20mA or 4-20mA current output. If a voltage signal is required, the current signal can also be converted and scaled.
