Crrc Qiqihar Rolling Stock Co., Ltd.

National Institute of Metrology

Zhong Hua Zhang

Yang Bai

Zheng Li

Li Yin

Qing He

Shiying Zhang

Dongwei Han

Yun Feng Lu

Xun Yin

Anguo Dai

Jiangang Yu

Disclosed are a laser heterodyne interferometric apparatus based on plane mirror reflection and a corresponding method. The interferometric apparatus includes a dual-frequency laser, a first photoelectric receiver, a second photoelectric receiver, a first polarizing beamsplitter, a second polarizing beamsplitter, a third polarizing beamsplitter, a quarter-wave plate, a right angle mirror, an optical compensator, and a measured plane mirror. The method performs heterodyne interferometry with two spatially separated beams of different frequencies and balances the optical path lengths of the measurement beam and the reference beam with the optical compensator. In the method, the measured plane mirror moves back and forth along the propagation direction of the input beams. The disclosure suppresses optical non-linearity and optical thermal drift in laser heterodyne interferometry, simplifies the optical path structure, and improves accuracy of laser heterodyne interferometry.

Laser heterodyne interferometric apparatus and method based on plane mirror reflection

Disclosed is a railway wagon for transporting trucks, including a middle running board device, end running board devices respectively arranged at two ends of the middle running board device, and a bridge board device arranged at the outer end of each end running board device. The middle running board device includes of multiple middle running board assemblies. Each middle running board assembly includes a running board connected to a side wall. At least one support plate connected to the side wall is arranged below the running board. Each end running board device includes multiple end running board assemblies. Each end running board assembly includes a running board connected to the side wall. At least one support plate connected to the side wall is arranged below the running board.

Railway wagon for transporting trucks and method for loading and unloading truck

Growing community of inventors

Beijing, China

Zhong Hua Zhang