The invention relates to a
metal powder laser rapid prototyping technology, in particular to a temperature field detecting method and the
system device in the working process of the
rapid prototyping of the
metal powder. The invention adopts
dual wavelength infrared image colorimetric temperature measuring method, the optical filters in two wavelengths are alternately arranged in the gathering
optical path at different times, the image in the fused bath from two different
wavelength are continuously and orderly gathered, and the
color matching calculation of the
gradation of the two
infrared image from different
wavelength are performed, according to the relationship between the
color matching value and the temperature value, the temperature value of each point of the image is acquired, the temperature value is represented by the tonal value and a
gradation image is formed, the
gradation image then is processed, and the shape and temperature
changing trend is acquired. By adopting the invention, the temperature distribution and the
changing trend of the temperature field of the fused bath can be detected in real time during the
rapid prototyping process of the
metal powder, and then the temperature of the work piece process parameter can be adjusted in real time.