The invention discloses a multi-spectral interferometer based on concentric ball focusing elements, belongs to the field of optical measurement, and solves the problem that an existing interferometer can only provide one type of measurement channel. Included is a front interference imaging
system. The
system consists of a complex
light source and an interferometer optical
system. In the interferometer, the light emitted by the complex
light source is incident on a
beam expander, the light emitted after the beam expansion is incident on a
first light splitting plate, the light is reflected by the
first light splitting plate and collimated by a collimating lens into parallel beams, and the parallel beams are incident vertically on a standard flat
crystal and an object to be measured in sequence; and the light is reflected by the standard flat
crystal and the object to be measured, the reflected light is transmitted through the
first light splitting plate to a second light splitting plate and enters into the collimating lens through the second light splitting plate to exit as parallel light, the parallel light is then subjected to a splitting
grating to split polychromatic light into light of different
spectral bands, and the light of different
spectral bands is focused on a
relay imaging system through concentric ball focusing elements for interference imaging detection and analysis by a
CMOS detector. The multi-spectral interferometer of the invention has the characteristics of common
optical path and multiple optical axes, and realizes multi-spectral interference detection.