64results about How to "Abbe's error is small" patented technology

The invention discloses a two-dimensional laser optical path gear measurement device. The device comprises a main motion shaft system, an optical path tracking and adjustment shaft system, and a laser interferometry system. The main motion shaft system comprises a rotary table and three linear motion shaft systems, moves along a measurement planning path, and executes various operations in the whole measurement process. Three linear motion shafts of the optical path tracking and adjustment shaft system make synchronous movement with the main motion shaft system, thereby guaranteeing that a laser optical path is not cut off and is in a collimation state. The laser interferometry system has X and Z two-dimensional laser wavelength measurement optical paths, is disposed nearby a gear tested point, and can directly measure a plurality of error items of a gear. The device is short in measurement chain, is high in measurement precision, is high in flexibility, and can meet the requirements of direct tracing measurement of gear errors.

The invention provides a reset compensation type three-optical-axis linear displacement laser interferometer calibration method and a reset compensation type three-optical-axis linear displacement laser interferometer calibration device, and belongs to the laser measurement technology. A measuring light beam of a laser interferometer to be calibrated passes through a middle through hole of a three-axis hollow laser interference mirror group, and is parallelly arranged in the center position of three parallel standard measuring light beams distributed in a regular triangular prism side edge form, the vertical distance from the standard measuring light beams to the measuring light beam of the laser interferometer to be calibrated is very small, the air refractive index average value of the three standard measuring light beams is approximate to the air refractive index value of the measuring light beam of the laser interferometer to be calibrated, three light beam position detectors respectively measure the derivative displacement of the three standard measuring light beams relative to a target reflecting mirror in a plane vertical to the standard measuring light beams in any two-dimensional directions, a micro inching device measures the derivative displacement average value according to the three light beam position detectors, the real-time reset compensation is carried out on the derivative displacement of the target reflecting mirror, and the incidence position of the measuring light beams on the reflecting surface of the target reflecting mirror is enabled not to be changed.

The invention discloses a vernier caliper capable of effectively reducing Abbe errors and a measuring method, which comprises a main ruler and a vernier ruler. The upper and lower ends of the front side of the vernier ruler are provided with flanges to form a main ruler accommodating groove, and the main ruler is arranged on the main ruler. The vernier scale is slidingly connected with the main scale in the scale accommodation groove, and pressure sensors are arranged symmetrically along the front and rear directions in the main scale accommodation grooves at the upper and lower ends. The pressure sensing device is used to collect the pressure signal generated by the main scale against the vernier scale. The signal output end of the pressure sensing device is connected to the signal input end of the processing module, and the signal output end of the processing module is connected to a display device; the processing module is used to receive the pressure signal input by the pressure sensing device, and perform signal processing on the pressure signal before calculating The differential pressure signal value used to represent the parallelism between the main line of the vernier scale and the main line of the main scale is obtained. The invention can solve the problems of large Abbe error and low measurement accuracy in the use process of the existing vernier caliper.