Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency.

Provide a technology that enables more appropriate determinations relating to the anomaly of a mechanical element in a rotating machine. The control device 40 according to an embodiment of the present disclosure includes the anomaly determining unit 403 configured to make a determination relating to an anomaly of a mechanical element of the compressor 10, based on an electrical feature amount of the compressor 10 that is electrically driven by the electric motor 20, wherein the electrical feature amount is a particular frequency component of a signal representing a physical amount that is correlated with a current of the electric motor 20 configured to drive the compressor 10, the particular frequency component is a predetermined positive integral multiple component of a rotational frequency of the compressor 10, and the anomaly determining unit 403 makes the determination relating to an anomaly of the mechanical element of the compressor 10, in consideration of a variation of a relationship between the anomaly of the mechanical element and the electrical feature amount of the compressor 10 (the electric motor 20), the variation being caused by a change in the rotational frequency of the compressor 10.

Provide a technology that enables more appropriate determinations relating to the anomaly of a mechanical element in a rotating machine. The control device 40 according to an embodiment of the present disclosure includes the anomaly determining unit 403 configured to make a determination relating to an anomaly of a mechanical element of the compressor 10, based on an electrical feature amount of the compressor 10 that is electrically driven by the electric motor 20, wherein the electrical feature amount is a particular frequency component of a signal representing a physical amount that is correlated with a current of the electric motor 20 configured to drive the compressor 10, the particular frequency component is a predetermined positive integral multiple component of a rotational frequency of the compressor 10, and the anomaly determining unit 403 makes the determination relating to an anomaly of the mechanical element of the compressor 10, in consideration of a variation of a relationship between the anomaly of the mechanical element and the electrical feature amount of the compressor 10 (the electric motor 20), the variation being caused by a change in the rotational frequency of the compressor 10.

A frequency measurement method and a system thereof are provided. The method includes: generating to-be-detected emergent light under an action of the electro-optical crystal when a light source irradiates an electro-optical crystal disposed in the microwave electric field; detecting, by a single-photon detector, the to-be-detected emergent light to obtain a detection result of the single-photon detector; and determining a frequency of the microwave signal based on the detection result of the single-photon detector and a Fourier transform algorithm.

A frequency measurement method and a system thereof are provided. The method includes: generating to-be-detected emergent light under an action of the electro-optical crystal when a light source irradiates an electro-optical crystal disposed in the microwave electric field; detecting, by a single-photon detector, the to-be-detected emergent light to obtain a detection result of the single-photon detector; and determining a frequency of the microwave signal based on the detection result of the single-photon detector and a Fourier transform algorithm.

The present invention relates to a processing of a signal under test in order to compensate frequency variations in the signal under test. For this purpose, the signal under test is mixed with a further digital signal. A frequency of the further signal which is used for mixing with the signal under test may be adapted in real-time according to frequency variations in the signal under test.

The present invention relates to a processing of a signal under test in order to compensate frequency variations in the signal under test. For this purpose, the signal under test is mixed with a further digital signal. A frequency of the further signal which is used for mixing with the signal under test may be adapted in real-time according to frequency variations in the signal under test.

Disclosed are a method and an apparatus for improving circuit health. The method includes obtaining an S-parameter plot of a circuit having an input port and an output port; determining a resonance frequency of the circuit based on the S-parameter plot; and estimating the health of the circuit based on the resonance frequency.

Disclosed are a method and an apparatus for improving circuit health. The method includes obtaining an S-parameter plot of a circuit having an input port and an output port; determining a resonance frequency of the circuit based on the S-parameter plot; and estimating the health of the circuit based on the resonance frequency.

The present invention proposes an arc detector having a multi-band frequency detection function, which divides an arc frequency band using multiple band-pass filters and detects whether or not an arc occurs in each of the divided frequency bands, thereby eliminating switching noise or power supply noise that mainly occurs in a certain frequency band, and consequently increasing the accuracy of arc detection. In addition, the arc detector of the present invention may minimize the use of expensive analog-to-digital converters and increase the accuracy of arc detection through overlapping area detection.