4results 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 invention discloses a semi-insulating silicon carbide crystal with a small optical path difference and a silicon carbide substrate, and belongs to the technical field of silicon carbide material preparation. The resistivity at any position of the silicon carbide crystal is gt; 1-N silicon carbide substrates are prepared from the silicon carbide crystal, N is a positive integer and represents the serial number of the silicon carbide substrates, the value of the first silicon carbide substrate containing the first end face of the silicon carbide crystal is 1, the optical path difference of any silicon carbide substrate meets the following formula: = a (N-1) + b, the unit is nm, the value range of a is-1 to 1, the value range of b is-1 to 1, and the value range of b is-1 to 1. The value of b is 0.5 to 10.5, and the unit is nm. The semi-insulating silicon carbide crystal and the semi-insulating silicon carbide substrate obtained from the semi-insulating silicon carbide crystal not only can meet the semi-insulating performance required by manufacturing radio frequency devices, photoelectric devices and the like, but also can reduce the optical path difference, so that the commercial application prospect of the semi-insulating silicon carbide substrate is improved.

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.

The present application provides a display panel and a display device, wherein the display panel includes a spacer and a first substrate and a second substrate arranged opposite to each other, wherein a groove structure is arranged on the side of the first substrate facing the second substrate, and the groove structure includes a bottom wall. The spacer is arranged on the second substrate and partially abuts the first substrate, and the spacer has a first surface on the side facing the first substrate, and the first surface is at least partially spaced from the bottom wall, and in the thickness direction of the first substrate, the projection of the first surface and the groove structure at least partially overlap. The first surface of the embodiment of the present application will not be completely in contact with the bottom wall. Part of the structure in the first surface will be exposed to the groove structure, so that the first surface will not be completely in contact with the first substrate. In this way, the friction between the spacer and the first substrate can be reduced, and the risk of the spacer being unable to rebound and reset due to excessive friction can be reduced, thereby improving the thickness uniformity between the first substrate and the second substrate, and improving the dark state uniformity of the display panel.