Working Principle and Main Features of the X-ray Thickness Gauge
The principle of the X-ray thickness gauge is to convert and measure the thickness based on the intensity attenuation of X-rays penetrating the object to be measured, that is, to measure the amount of X-rays absorbed by the steel plate under test, and determine the part to be measured based on the energy value of the X-rays. thickness of. The received signal is converted into an electrical signal by the X-ray detector, amplified by a preamplifier, and then converted into an actual thickness signal by a dedicated thickness gauge operating system that is displayed to people intuitively.
The radiation intensity of the X-ray source is related to the emission intensity of the X-ray tube and the X-ray intensity absorbed by the steel plate being tested. For a given thickness within the system range, in order to determine the required X-ray energy value, the M215 X-ray detector can be used for calibration. When detecting any special thickness, the system will set the energy value of the X-ray so that the detection can be completed smoothly.
When the thickness is constant, the energy value of X-rays is constant. When the safety shutter is opened, X-rays will pass through the steel plate under test between the X-ray source and the probe. The steel plate under test will absorb part of the energy, and the remaining X-rays will be received by the probe located directly above the X-ray source. The probe will receive the The X-rays are converted into an output voltage related to their magnitude. If the thickness of the steel plate under test is changed, the amount of X-rays absorbed will also change, which will cause the amount of X-rays received by the probe to change, and the detection signal will also change accordingly.
Radiation thickness gauges can be divided into two types according to the type of radiation source: X-ray thickness gauges and nuclear radiation thickness gauges, and the latter can be multi-ray thickness gauges and radiation thickness gauges. According to the interaction between the rays and the tested plate, it can be divided into penetrating type and reflection type.
The ray thickness gauge is an instrument that uses the effect of absorption or scattering by the substance when the ray interacts with the substance to measure. Its main features:
(1) Continuous and non-contact measurement is possible;
(2) The measurement accuracy is high;
(3) The reaction speed is faster;
(4) It can provide electrical signals for moisture indication, recording and control, making it easy to realize production automation.
