The invention relates to an
infrared radiation illumination
measuring instrument and a method using the
measuring instrument to measuring
infrared radiation illumination, belonging to the field of
optics, and solving the problems of inaccurate and unreasonable calibration, large error, low precision of detecting weak signals,
large size and inconvenience in carrying existing in the current
radiation illumination
measuring instrument. In the
infrared radiation illumination measuring instrument, incident parallel light beams are focused through a main objective lens, and output light beams are modulated through a modulation disc to a first
relay lens, a
light filter, an attenuation slice group and a second
relay lens and is then incident onto the photosurface of a photoelectric
detector. The photoelectric
detector outputs an electrical
signal, the electrical
signal is amplified and carries out
phase locking and AD (Analog to Digital) conversion, and a
voltage signal is output to a computer. The rotational speed of a modulation disc motor is controlled, and a
driving circuit controls the modulation of the modulation disc and controls the
phase locking of a lock-in
amplifier. The measuring instrument uses a standard blackbody to carry out calibration to obtain the relationship between the
voltage signal and the infrared radiation illumination, and the measurement to the infrared radiation illumination of an infrared target simulator is realized.