3results about How to "Increase the optical path" patented technology

This invention provides a grating ruler displacement sensor based on an oblique incidence optical path, relating to the field of optical measurement technology, to address to some extent the problem of excessively large readhead size hindering installation in small spaces. The grating ruler displacement sensor based on an oblique incidence optical path provided by this invention includes a readhead module and a grating ruler. The readhead module includes a housing, a PCB, and a light source. The top wall of the housing has a mounting plane for mounting the PCB, which is mounted on the mounting plane. The light source is integrated on the side of the PCB facing the top wall of the housing. A light-emitting aperture is formed on the top wall of the housing corresponding to the position of the light source, allowing light emitted from the light source to exit the housing. The mounting plane is obliquely positioned and forms an angle with the outer surface of the top wall of the housing. The grating ruler is parallel to the outer surface of the top wall of the housing. Using the structure provided in this application, the overall thickness of the readhead can be made very small, thus enabling easy installation in confined spaces such as micro-machine tools and precision displacement stages.

The application relates to the technical field of hydrogen concentration optical visual detection, in particular to a hydrogen concentration detection device which comprises a detection table, an optical testing device body arranged on the detection table, a detection pipeline body in communication with one end of the optical testing device body, visual detection of a to-be-detected gas by the optical testing device body after the to-be-detected gas enters the detection pipeline body, a joint, a mixing assembly, a buffer assembly, a speed reduction assembly and a reflection assembly arranged in the detection pipeline body in sequence along a gas entering direction; the mixing assembly, the buffer assembly, the speed reduction assembly and the reflection assembly are arranged in the detection pipeline body in sequence, and the optical testing device body is combined with the optical regulation and control means of a beam splitter and a concave lens, the problem of uneven hydrogen distribution is solved through the mixing assembly, the gas flow rate is reduced and the contact time is prolonged through the buffer and speed reduction assembly, and finally the optical path is significantly prolonged through the optical assembly, and the detection signal is enhanced.

This invention discloses a back-contact solar cell, its fabrication method, a cell string, a cell module, and a photovoltaic system. The back-contact solar cell includes: a silicon substrate configured with a first conductivity type and including a first surface and a second surface; a first doped layer configured with the first conductivity type and located on the first surface; a second doped layer configured with the second conductivity type and located on the first surface; the first and second doped layers are alternately arranged along a first direction and extend along a second direction; the first doped layer is wavy along the second direction; and / or, the second doped layer is wavy along the second direction; a first electrode layer; and a second electrode layer. In this invention, light undergoes diffuse reflection on the wavy doped layer surface, resulting in more light being reflected back into the cell, increasing the contact area between the electrode layer and the doped layer, reducing contact resistance, and improving photoelectric conversion efficiency.