2results about How to "Reduce optical path difference" patented technology

The application is suitable for the technical field of laser radar, and provides a laser radar, which comprises a light source, a transmitting module, a receiving module, a transmission module, a detecting module and a signal processing module; the transmission module comprises a first coupler and a plurality of transmission media, wherein the local oscillator beam is transmitted to at least one transmission medium for delay processing through the first coupler, and the delay amount of the at least one transmission medium is different from that of the other transmission media; the detecting module is connected with the transmission module and the receiving module respectively, is used for receiving the echo signal and the delayed local oscillator beam output by the transmission module, performing beat frequency processing on the echo signal and the delayed local oscillator beam to obtain a beat frequency signal, and converting the beat frequency signal into a detecting electric signal; and the signal processing module is electrically connected with the detecting module, is used for determining a to-be-measured object according to the detecting electric signal. The laser radar provided by the application can improve the strength of the detection signal in long-distance measurement.

The application relates to the technical field of optics, in particular to a sensor module, a Schlieren optical system and electronic equipment. The application aims to solve the technical problem that the imaging plane of a Schlieren lens is inclined relative to the optical axis, resulting in geometric aberration of imaging and affecting the imaging quality. The sensor module of the application is provided with a light wedge on the light-sensing surface side of a light-sensing chip, and object-side light rays are imaged on the light-sensing chip via the light wedge. The light wedge has a preset included angle between the entrance surface and the exit surface. After the refraction of the light rays via the light wedge, the optical path difference between the meridional light beams and the sagittal light beams in the light rays is reduced, the distance between the convergence points of the meridional light beams and the convergence points of the sagittal light beams is reduced, the geometric aberration caused by the inclined imaging light-sensing surface is reduced, the imaging quality of the Schlieren optical system is improved, and the detection precision of the Schlieren optical system is further improved. Moreover, the light wedge replaces the existing light-transmitting cover plate and also plays a role in protecting the light-sensing chip.