2results about How to "Stable output frequency" patented technology

The invention discloses a renovation method of an interferometer, the interferometer comprises an aged laser tube, the renovation method of the interferometer comprises the following steps: taking out the aged laser tube from the interferometer, sleeving one end of a new laser tube with a first C-shaped snap ring along the extension direction of the new laser tube, and sleeving the other end of the new laser tube with a second C-shaped snap ring; the thermal expansion coefficient of the C-shaped clamping ring is less than 3ppm / DEG C; after the new laser tube sleeved with the C-shaped clamping ring is installed in the metal sleeve, the metal sleeve internally provided with the new laser tube and the C-shaped clamping ring is embedded into the magnetic ring of the interferometer. According to the technical scheme, the stability of the output frequency of the new laser tube in the interferometer can be improved, and then the measurement accuracy of the renovated interferometer is improved.

The application belongs to the field of integrated circuit technology design, and relates to a passive and crystal-free GFSK transmitter chip, which comprises a radio frequency energy collection module, a power management module, a clock recovery module and an open-loop modulation transmitter module, the radio frequency energy collection module is used for wireless power supply, the power management module controls a power switch of the transmitter chip according to a power supply voltage value, when the power switch is opened, the power management module supplies power to the open-loop modulation transmitter module, the clock recovery module provides a reference frequency for the open-loop modulation transmitter module, and the open-loop modulation transmitter module multiplies the reference frequency to a radio frequency frequency required for transmission and transmits a data signal. The transmitter chip has the advantages of low power consumption and small size, is suitable for wireless sensor network nodes, and has strong commercial value.