10results about "Time interval measurement" patented technology

The present invention presents a device for indicating at least one physical quantity and / or the passage of time and for sending it electronically. The device comprises an RFID chip (32, 41, 52, 59) and an electrochemical cell or cell group (42, 43, 45) connected to the RFID chip input. Discharging or charging of the cell or the last cell in the cell group (42, 43, 45) or a change in the charge status of the cell causes the RFID chip's (32, 41, 52, 59) so-called tamper input to turn to be logically opposite. The data is sent to a reading device with an antenna according to NFC (46), Bluetooth or UHF or LF technology. More than one cell, for example the last two (45, 42) can also be steered to the tamper input, for example in food applications. The first cell (43) can be arranged to be cut with a tear strip (44), whereby the start time of the device can be determined by the user. Said physical quantity can be temperature, relative humidity, electromagnetic radiation and / or vibration.

Described are systems and methods which can be used to indicate the period of time elapsed since the occurrence of a triggering event. More particularly, this application relates to systems and methods which can be used to visually indicate the time period elapsed since an article has been removed from its packaging. The system can include an indicator disposed on or within the article and a trigger disposed within the receptacle and in contact with the indicator. The article may be enclosed within a sealable receptacle of the package. The indicator is responsive to a change in a concentration of the trigger in contact with the indicator. The removal of the article from the receptacle can induce a change in concentration of the trigger in contact with the indicator. The change in the concentration of the trigger can induce a change in color in the indicator. The color change indicates a predetermined period of time has elapsed since the article has been removed from the receptacle. The predetermined period of time is from 30 minutes to 30 days, such as from 1 hour to 30 days.

The embodiment of the invention provides a microsphere suspension property detection device and method, and belongs to the technical field of suspension liquid measurement. The device comprises a laser transmitter used for transmitting a pulse signal to the microsphere suspension, a signal receiver used for receiving a reflection signal of the microsphere suspension, and a data processing assembly used for determining the signal intensity of the reflection signal according to the transmitting time, the receiving time and the signal intensity of the reflection signal. Obtaining the accumulated semaphore returned by the microspheres of the microsphere suspension above the preset height and the total reflection semaphore returned by the microspheres in the whole height interval, and obtaining a real-time detection value; and the data output assembly is used for obtaining the suspension time according to the real-time detection value and a preset detection threshold value. Therefore, a unified judgment standard can be established for the suspension property of the microspheres, subjective judgment of operators is avoided, the suspension time of the microspheres is obtained through detection under the unified judgment standard, and the detection error of the suspension time is reduced, so that the suspension property of the microspheres is accurately evaluated, and the detection efficiency is improved.

The utility model discloses an automatic timing and flow measuring barrel. Comprising a barrel body, an automatic timing device and a water level sensor, the automatic timing device is arranged on the outer side wall of the upper portion of the barrel body and comprises an infrared emitter, a reflecting plate and a timer, the infrared emitter is arranged on the outer side wall of one side of the upper portion of the barrel body, and the reflecting plate is arranged on the side wall of the other side of the upper portion of the barrel body in the mode of directly facing the infrared emitter; the water level sensor is arranged on the inner side wall of the lower part of the barrel and is in contact connection with the inner bottom surface of the barrel. According to the utility model, the timing function and the liquid measuring function are combined, the convenience of measuring the liquid flow by a single person is realized, the working efficiency is improved, the personal error is reduced, the reliability and the accuracy of data are improved, and a data storage function is provided, so that the subsequent data analysis is facilitated.

This invention discloses a device, system, and method for precise time measurement of PET using lasers. The device for precise time measurement of PET using lasers includes a PET detector module, a PET digital electronics board, and a laser. The PET detector module detects gamma photons emitted by the target and sends the generated detection signal to the PET digital electronics board. The PET digital electronics board is equipped with an optoelectronic device for receiving light pulse signals and converting them into a clock reference signal. The laser generates light pulse signals and sends them to the optoelectronic device. The PET digital electronics board digitizes the received detection signal according to the clock reference signal and measures the time. This device improves upon traditional PET systems, fully leveraging the time performance advantages of the detector, electronics, and other components.

The utility model discloses time interval measuring equipment based on a high-speed video collector, and belongs to the technical field of time interval measurement and metering traceability. In order to solve the technical problems of high measurement uncertainty and incapability of accurately tracing due to difficulty in synchronous triggering of visual triggering type timing equipment, the utility model comprises at least two independently adjustable lenses and light paths, the light guide system is used for receiving and deflecting light of each light path; and a high-speed photosensitive device. The key point is that the light guide system converges light from different lenses and images the light on different areas of the single high-speed photosensitive device respectively. Visual information of a time standard source and a detected object can be synchronously recorded at a high speed through the photosensitive device, and an accurate time interval is calculated by analyzing a video key frame and combining with a known frame rate. According to the utility model, the synchronization error is effectively eliminated, the uncertainty is reduced to millisecond level, the high-precision measurement and traceability of visual trigger equipment are realized, the structure is compact, and the adjustment is convenient.

In some embodiments, an optical communication system may include an optical source, a modulator, and a photoreceiver. The optical source may be configured to generate a beam comprising a series of light pulses each having a duration of less than 100 picoseconds. The photoreceiver may have a detection window duration of less than 1 nanosecond. When a first pulse travels through a variably refractive medium, photons in the first pulse may be refracted to travel along different ray paths to arrive at the photoreceiver according to a temporal distribution curve. A full width at half maximum (FWHM) value of the temporal distribution curve may be at least three times as large as a coherence time value of the first pulse, and the detection window of the photoreceiver may be at least six times as large as the FWHM value of the temporal distribution curve.

The invention discloses a moon shadow time calculation method based on an SGP4 model, and relates to the technical field of spacecraft orbit dynamics and energy management.The moon shadow time calculation method comprises the steps that a closed feedback loop is formed by extending a Kalman filter state variable and taking the instantaneous noise offset of an atmospheric resistance parameter B * as an independent estimation target; orbital perturbation changes caused by sun activity peaks, sudden geomagnetic disturbance and the like can be tracked in real time, and the stability of penumbra entering and exiting time of the near-earth satellite is remarkably improved; in order to solve the problem of frequent switching of shadow intervals of high-orbit satellites, a time period merging strategy based on an error ellipsoid and shadow area overlapping probability is provided. By quantizing the contribution of the position uncertainty to the shadow state, a pseudo switching event generated by model jitter is filtered out, a continuous shadow time period conforming to engineering practice is output, and invalid operation of an energy system is reduced.

The invention discloses a high-precision delay measurement system, and the system comprises a light source which is used for generating a light pulse signal with repetition frequency; the pulse width stretcher is used for stretching the optical pulse signal in a time domain so as to form a linear chirp signal; the beam splitter is used for splitting the linear chirp signal into a first optical signal and a second optical signal; the Mach-Zehnder interferometer comprises a first interference arm and a second interference arm connected to the delay line to be measured, the first interference arm is used for enabling the first optical signal to pass through, and the second interference arm is used for enabling the second optical signal to pass through; the beam combiner is used for enabling the first optical signal and the second optical signal to interfere so as to combine the first optical signal and the second optical signal into an interference optical signal; the photoelectric detector is used for converting the interference light signal into a corresponding electric signal; the oscilloscope is used for collecting the time shift of the interference waveform of the electric signal; and calculating the delay of the delay line to be measured according to the collected time shift. According to the method, a brand new measurement mechanism is established, so that the inherent measurement precision stably reaches the femtosecond magnitude.

The application provides a determination method and device for detecting missing time of track points on an expressway. The determination method comprises the following steps: determining a time length distribution function corresponding to each track missing section of a target vehicle on an expressway based on the historical passing time length of each track missing section; determining a target function corresponding to all track missing sections based on each time length distribution function and a target time length constraint condition corresponding to each track missing section; performing optimization solving on the target function to determine a target time length corresponding to each track missing section of the target vehicle; and determining missing time information of track detection points corresponding to each track missing section of the target vehicle based on each target time length and time information of track detection points corresponding to each track normal section of the target vehicle. The application can determine the missing time information of track detection points corresponding to each track missing section of the target vehicle on the expressway, and improve the accuracy of completing the missing track points.