Abstract: A laser line-projection device with a ranging function. The laser line-projection device comprises a support, a suspension system, a laser line-projection module and a laser ranging module, wherein the suspension system is movably connected to the support and the suspension system swings freely with gravity to realize a suspended state; and the laser line-projection module and the laser ranging module are fixedly mounted on the suspension system, the laser line-projection module projects on a plane to form crossed beams which have an intersection point, and an axis of a ranging beam emitted by the laser ranging module passes through the intersection point.

Abstract: The present disclosure relates to the field of building construction, in particular to construction detection equipment. The present disclosure relates to a construction surface flatness detector, which comprises a housing mounted on a base. An inclination adjustment mechanism, a levelness calibration unit, a height adjustment mechanism and a rotation mechanism are mounted between the housing and the base; a pair of laser line projecting units for emitting laser lines in parallel is symmetrically mounted at two ends of the housing; a certain included angle is formed between laser sectors projected by the pair of laser line projecting units; and intersecting lines of the laser sectors are located on a horizontal plane where the base is located.

Abstract: A optical path structure and a cross line laser comprising the same are provided. The optical path structure comprises a laser emitter (1) for emitting laser light, and the following devices arranged sequentially along the direction of the optical path of the laser light: an aspherical mirror (2), a first beamsplitter (31) and a second beamsplitter (32), a wedge-shaped mirror (4), and a cylindrical mirror (5). The advantages of the present invention are that: 1) the angle of the incident surface (41) of the wedge-shaped mirror (4) is reasonably set such that the light ray reflected by the incident surface (41) of the wedge-shaped mirror (4) cannot emit onto the beamsplitters (31, 32), or even if it emits onto the beamsplitters (31, 32), there is no interference with the reflected light rays (61, 63) by the beamsplitters (31, 32), avoiding the multiple-point phenomenon; 2) the structure of the wedge-shaped mirror (4) is reasonably set such that the breakpoints in the projected laser light line are eliminated.

Abstract: A laser diode control method and control system, and a laser device. The control method comprises: using a first driving voltage and a first duty cycle to drive a laser diode to start working; acquiring the working time of the laser diode; and when the working time of the laser diode exceeds a first time threshold, using a second driving voltage and a second duty cycle to drive the laser diode to work, wherein the second driving voltage is lower than the first driving voltage, and/or the second duty cycle is smaller than the first duty cycle, such that the power consumption in the working process of the laser diode can be effectively reduced, and an excessive high temperature of the laser diode during normal operation can be prevented.

Abstract: The present disclosure relates to the field of architecture and civil engineering, in particular to a construction surveying system. A laser surveying system for setting out comprises a horizontal laser emitter for emitting horizontal laser beams in a sector; a vertical laser emitter for emitting vertical laser beams in a sector; a leveling laser rangefinder; and at least one laser receiver; The horizontal and vertical laser beams in a sector intersect at an intersection line, an optical axis of ranging beams of the leveling laser rangefinder coincides with the intersection line, the laser receiver includes a laser entrance window and a laser plummet, and an axis of the laser entrance window coincides with the intersection line. According to the present disclosure, the aim direction of the laser emitter can be indicated for operators by the intersection line of the laser beams in a sector.

Abstract: Genomic insertions, duplications, and insertion/deletion (indels) account for ˜14% of human pathogenic mutations. Current gene editing methods cannot accurately or efficiently correct these abnormal genomic rearrangements, especially larger alterations (>100 bp). The presently disclosed compositions and methods accurately delete insertions/duplications and repair the deletion junction to improve the scope of gene therapies. For example, a Cas9 prime editor (PECas9) is combined with two prime editing guide RNAs (pegRNAs) targeting complementary DNA strands. PECas9 can replace an ˜1-kb genomic fragment with a desired sequence at the target site without requiring an exogenous DNA template.

Abstract: A purpose of the utility model is to provide a laser receiving device, which comprises a photoelectric sensor, a main control board and a display module, wherein both the photoelectric sensor and the display module are connected with the main control board; the laser receiving device further comprises a laser ranging module; and the laser ranging module is connected with the main control board. By configuring the laser ranging module in the laser receiving device, a problem of complex operation due to the fact that receivers on the market must be matched with a telemeter rod at present is solved.

Abstract: A laser diode control method and control system, and a laser device. The control method comprises: using a first driving voltage and a first duty cycle to drive a laser diode to start working; acquiring the working time of the laser diode; and when the working time of the laser diode exceeds a first time threshold, using a second driving voltage and a second duty cycle to drive the laser diode to work, wherein the second driving voltage is lower than the first driving voltage, and/or the second duty cycle is smaller than the first duty cycle, such that the power consumption in the working process of the laser diode can be effectively reduced, and an excessive high temperature of the laser diode during normal operation can be prevented.

Abstract: A high-speed laser distance measuring device is described that includes an emitting part and a receiving part. The emitting part can include a polarizer (2) arranged between a light emitting tube (1) and a reflective mirror (3); the receiving part can further include a polarizing beamsplitter (7) arranged between the optical filter (6) and the receiving tube set. The light emitting tube (1) can emit an outgoing light beam to the polarizer (2), and the outgoing light beam can form an outgoing polarized light beam and is transmitted into the reflective mirror (3). After being reflected by the reflective mirror (3) and passing through the transmitting objective lens (4), the outgoing polarized light beam can be transmitted onto a target object. After being reflected by the target object, the outgoing polarized light beam can form a reflected polarized light beam, which passes through the receiving objective lens set (5) and is transmitted to the optical filter (6).

Abstract: A laser distance measuring device and a method of use thereof are described. The laser distance measuring device can include an emitting unit (4), a reflecting mirror (3), an emitting lens (2), a receiving lens (1), and a receiving unit (8); the laser distance measuring device can further include: at least one spectroscope (7) provided between the receiving lens (1) and the receiving unit (8), which is arranged successively on the same optical propagation path; at least one spectrum receiving unit (9) arranged in a one-to-one correspondence with the spectroscope (7). The technical solution has a wider measurement range and is adaptable to measured targets in different distances; a multiplicity of feedbacks and adjustments is not necessary, and the acquirement of the measurement data can be achieved in a short time, therefore the operating time is saved.

Abstract: A laser radar receiving system including a laser radar and a reflecting element. The laser radar includes a first reflector mirror, an emitting channel, an emission system and a basic receiving system. The laser beam emitted by the emission system is reflected by the first reflector mirror, reaches a target through the emitting channel, is reflected from the target and passes through the emitting channel, and is reflected by the first reflector mirror and received by the basic receiving system. The reflecting element is provided in an area outside the emitting channel that is unreachable by the laser beam reflected from the target, and is used for reflecting the laser beam from the area outside the emitting channel to the basic receiving system, thereby simultaneously avoiding blind area and stray light interference in short-range measurements, and improving measurement accuracy and expanding the short-range measurement range of radar.

Abstract: A laser collimation- measuring system, including: a first laser source; a second laser source; a light combining device; a collimator; and a light divergence device. The first laser source and the second laser source emit a first laser and a second laser, respectively, to the light combining device. The first laser and the second laser are transmitted through the light combining device as a third laser and a fourth laser, respectively, and the third laser partially overlaps the fourth laser. The collimator is disposed in a light path of the third and fourth lasers and positioned between the light combining device and the laser divergence device. The laser collimation-measuring system enhances intensity of the laser collimation-measuring system.

Abstract: A laser point projecting device including a light source assembly that projects first and second positioning points respectively along two directions of a straight line. The laser point projecting device includes a housing part forming a sleeve around a body part. The body part and the housing part are displaceable relative to each other. The light source assembly is switched off when the body part is displaced to a first position along the direction of projecting the first positioning point; and the light source assembly is activated when the body part is displaced to a second position along the direction of projecting the second positioning point. The housing part has at least one opening at the end along the direction of projecting the first positioning point, and a hollow space formed between the end of the housing part close to the first positioning point and the body part.

Abstract: An optical system of a cross line laser, and a cross line laser. The optical system of the cross line laser includes light emitting elements, which include a first light emitting element and a second light emitting element, which emit a first light ray and a second light ray, respectively, of different colors; the control unit is connected with the light emitting elements, and turns on or off the first light emitting element and the second light emitting element; the optical means includes a semi-transparent mirror fixed on the optical path of the first light ray and the second light ray; the first light ray passes through the semi-transparent mirror and is emitted as a third light ray; and the second light ray is refracted by the semi-transparent mirror as a fourth light ray. The colors of the cross line laser can be switched using the optical system.

Abstract: The present utility model provides a stain detection device and a laser radar. The stain detection device is applied to a window cover and comprises a signal emitting unit provided at a first side of the window cover; a first receiving unit provided at the first side of the window cover for receiving signal sent by the signal emitting unit and without passing through the window cover; a second receiving unit provided at a second side of the window cover for receiving signal sent by the signal emitting unit and passing through the window cover; and a processing unit connected to the first receiving unit and the second receiving unit for comparing the signals received by the first receiving unit with that of the second receiving unit so as to judge whether there is a stain on the surface of the window cover.