Transmission-type temperature field measuring device and method based on infrared digital holographic technology

The invention discloses a transmission-type temperature field measuring device and method based on an infrared digital holographic technology, and belongs to the field of infrared digital holography application. The device comprises an infrared laser, a beam splitter, a beam expander, a lens, a reflecting mirror, a temperature field detection cavity, an infrared focal plane array imaging sensor, an image processing unit and a U-shaped lightproof shell. According to the device, the U-shaped lightproof shell is used for protection and fixation, and only two circular holes are reserved in the device, and the lens III and the lens IV made of germanium are embedded in the circular holes, so that visible light interference is avoided, and the purpose of improving the measurement precision is achieved. According to the method, the stripe displacement is calculated through image subtraction in combination with the pixel point size, and the temperature field variation is calculated through the stripe displacement; the