Abstract: A method of processing FMCW radar signal retrieves a configuring parameter set (120) corresponding to a working environment or a detected material, receives a reflection time-domain signal, executes a time-domain-to-frequency-domain converting process to the reflection time-domain signal for obtaining a reflection frequency-domain signal, executes the corresponded process on the reflection frequency-domain signal according to the configuring parameter set (120), and analyzes the processed reflection frequency-domain signal and generates a detecting result. The present disclosed example can effectively reduce the time of the development and the cost of manufacture via executing the corresponded process according to the configuring parameter set (120) corresponding to the working environment or the detected material.

Abstract: A liquid level sensing apparatus (10) for long-distance automatically enhancing a signal-to-noise ratio is applied to a measured target (20). The liquid level sensing apparatus (10) includes a sensing module (102), a long-distance command receiving module (104) and at least a brake module (106). The sensing module (102) transmits a sensing signal (108) to the measured target (20). The sensing signal (108) touches the measured target (20) to reflect back a reflected signal (110). The sensing module (102) receives the reflected signal (110) to measure the signal-to-noise ratio and to measure a height of the measured target (20). The long-distance command receiving module (104) is electrically connected to the sensing module (102). The long-distance command receiving module (104) receives a long-distance command signal (302). The brake module (106) is mechanically connected to the sensing module (102).

Abstract: A method for measuring a permittivity (?) of a material (30) includes following steps. A sensing rod (14) of a material level sensor (10) inserts into a tank (20). The material level sensor (10) proceeds with a material level measurement of the material (30) to obtain a first feature value. The material level sensor (10) is vertically moved with a vertical distance (Hair). The material level sensor (10) proceeds with the material level measurement to obtain a second feature value, and subtracts the first feature value by the second feature value to obtain a feature value variation, and calculates the feature value variation to obtain the permittivity (?) of the material (30).

Abstract: A probe (14) of a material level measuring apparatus (10) inserts into a container (20). The material level measuring apparatus (10) transmits an electromagnetic wave signal. When the electromagnetic wave signal touches a surface of a material (30), a first reflected signal is generated. When the electromagnetic wave signal touches a bottom of the probe (14), a second reflected signal is generated. According to the first reflected signal and the second reflected signal, a first time-passing difference value (t1) and a second time-passing difference value (t2) are obtained. According to the first time-passing difference value (t1), the second time-passing difference value (t2) and a predetermined empty container time-passing difference value (t3), a first material level and a second material level are obtained. According to the first material level and the second material level, a third material level is obtained.

Abstract: A radar level transmitter (1, 1a) includes a detection body (10, 10a), an antenna body (20, 20a) and a film sheet (30, 30a). The detection body (10, 10a) has a circuit board (12) being capable of emitting signals of detection and receiving reflected signals. One end of the antenna body (20, 20a) connects with the detection body (10, 10a). The film sheet (30, 30a) is combined with the antenna body (20, 20a) and covers another end of the antenna body (20, 20a); an airflow passes through the film sheet (30, 30a) for being capable of removing dusts adhered to the film sheet (30, 30a). Therefore, a radar level transmitter (1, 1a) with dust removing structures is achieved and a regular cleaning by personnel is not necessary.

Abstract: A liquid level sensing apparatus (10) for long-distance automatically enhancing a signal-to-noise ratio is applied to a measured target (20). The liquid level sensing apparatus (10) includes a sensing module (102), a long-distance command receiving module (104) and at least a brake module (106). The sensing module (102) transmits a sensing signal (108) to the measured target (20). The sensing signal (108) touches the measured target (20) to reflect back a reflected signal (110). The sensing module (102) receives the reflected signal (110) to measure the signal-to-noise ratio and to measure a height of the measured target (20). The long-distance command receiving module (104) is electrically connected to the sensing module (102). The long-distance command receiving module (104) receives a long-distance command signal (302). The brake module (106) is mechanically connected to the sensing module (102).

Abstract: A sensing apparatus includes a probe and a sensing module. The sensing module includes a material sensing circuit, an operation unit and a signal output circuit. The sensing module generates a frequency sweep signal and sends the frequency sweep signal to the probe to sense a status of a material. The frequency sweep signal is a plurality of signals having different frequencies from each other in a predetermined frequency range. When the frequency sweep signal touches the material, an equivalent capacitance of the material is utilized to generate a reflected signal. The material sensing circuit receives the reflected signal and sends the reflected signal to the operation unit. The operation unit operates the reflected signal to generate a waveform signal to determine the status of the material. The operation unit utilizes an impedance spectrum to determine the status of the material.

Abstract: A radar liquid level measuring apparatus (10) includes a first oscillation module (102), a second oscillation module (104), a frequency comparator (106) and a control module (107). The first oscillation module (102) has a first oscillation frequency. The first oscillation module (102) generates a first pulse signal (10202). The second oscillation module (104) has a second oscillation frequency. The second oscillation module (104) generates a second pulse signal (10402). The frequency comparator (106) converts the first pulse signal (10202) and the second pulse signal (10402) into an adjusted signal (10602). The control module (107) compares the adjusted signal (10602) with an expectation value (10818) to obtain a comparative result signal. According to the comparative result signal, the control module (107) adjusts the second oscillation frequency, so that the second oscillation frequency and the first oscillation frequency have a constant frequency difference.

Abstract: A method of processing FMCW radar signal retrieves a configuring parameter set (120) corresponding to a working environment or a detected material, receives a reflection time-domain signal, executes a time-domain-to-frequency-domain converting process to the reflection time-domain signal for obtaining a reflection frequency-domain signal, executes the corresponded process on the reflection frequency-domain signal according to the configuring parameter set (120), and analyzes the processed reflection frequency-domain signal and generates a detecting result. The present disclosed example can effectively reduce the time of the development and the cost of manufacture via executing the corresponded process according to the configuring parameter set (120) corresponding to the working environment or the detected material.

Abstract: A time domain reflectometry waveguide structure (1) includes: a control module (10) for transmitting a sensing signal and receiving a reflection signal fed back from the sensing signal; a waveguide sensor (20) connected to the control module (10) and including a first probe (21) connected to the control module (10), a curved probe (22) connected to the first probe (21) and a second probe (23) extended from the curved probe (22); a protective cover (30) coaxially sheathed on the first probe (21) and exposing the curved probe (22), and a sensing signal passing through the protective cover (30) and the first probe (21) without interference and transmitted to the curved probe (22) and the second probe (23) to obtain the reflection signal; and an insulator (40) covered onto the waveguide sensor (20) and the protective cover (30) to prevent interference, facilitate measurements, and measure environmental parameters of different media.

Abstract: A material level indicator includes a probe, first and second signal compensating units, arranged at first and second ends of the probe respectively, and a controlling module arranged at the first end and includes a signal processor, a signal emitter, and a signal receiver. The second end is opposite to the first end. The signal processor is connected to the signal emitter and the signal receiver. The signal emitter emits an electromagnetic signal from the first end to the second end of the probe. The first and second signal compensating units reflect the electromagnetic signal, and the signal processor generates first and second time interval differences according to the reflected electromagnetic signal received by the signal receiver. The signal processor calibrates an environmental coefficient and indicates a dielectric coefficient of the material according to the first and second time interval differences respectively.

Abstract: A material level indicator includes a probe, first and second signal compensating units, arranged at first and second ends of the probe respectively, and a controlling module arranged at the first end and includes a signal processor, a signal emitter, and a signal receiver. The second end is opposite to the first end. The signal processor is connected to the signal emitter and the signal receiver. The signal emitter emits an electromagnetic signal from the first end to the second end of the probe. The first and second signal compensating units reflect the electromagnetic signal, and the signal processor generates first and second time interval differences according to the reflected electromagnetic signal received by the signal receiver. The signal processor calibrates an environmental coefficient and indicates a dielectric coefficient of the material according to the first and second time interval differences respectively.

Abstract: A probe (14) of a material level measuring apparatus (10) inserts into a container (20). The material level measuring apparatus (10) transmits an electromagnetic wave signal. When the electromagnetic wave signal touches a surface of a material (30), a first reflected signal is generated. When the electromagnetic wave signal touches a bottom of the probe (14), a second reflected signal is generated. According to the first reflected signal and the second reflected signal, a first time-passing difference value (t1) and a second time-passing difference value (t2) are obtained. According to the first time-passing difference value (t1), the second time-passing difference value (t2) and a predetermined empty container time-passing difference value (t3), a first material level and a second material level are obtained. According to the first material level and the second material level, a third material level is obtained.

Abstract: A method for measuring a permittivity (?) of a material (30) includes following steps. A sensing rod (14) of a material level sensor (10) inserts into a tank (20). The material level sensor (10) proceeds with a material level measurement of the material (30) to obtain a first feature value. The material level sensor (10) is vertically moved with a vertical distance (Hair). The material level sensor (10) proceeds with the material level measurement to obtain a second feature value, and subtracts the first feature value by the second feature value to obtain a feature value variation, and calculates the feature value variation to obtain the permittivity (?) of the material (30).

Abstract: A radar liquid level measuring apparatus (10) includes a first oscillation module (102), a second oscillation module (104), a frequency comparator (106) and a control module (107). The first oscillation module (102) has a first oscillation frequency. The first oscillation module (102) generates a first pulse signal (10202). The second oscillation module (104) has a second oscillation frequency. The second oscillation module (104) generates a second pulse signal (10402). The frequency comparator (106) converts the first pulse signal (10202) and the second pulse signal (10402) into an adjusted signal (10602). The control module (107) compares the adjusted signal (10602) with an expectation value (10818) to obtain a comparative result signal. According to the comparative result signal, the control module (107) adjusts the second oscillation frequency, so that the second oscillation frequency and the first oscillation frequency have a constant frequency difference.

Abstract: An FMCW radar level meter has an RF signal processing module, an intermediate frequency (IF) signal processing module, and a computation and display module. A signal generator of the RF signal processing module generates a first RF signal, which is radiated by an antenna to a measured object. The antenna received a second RF signal reflected by the measured object. The IF signal processing module processes the second RF signal and compares the first RF signal with the second RF signal. The computation and display module calculates and displays a distance between the FMCW radar level meter and the measured object. Using the RF signal processing module and the IF signal processing module to process the second RF signal, the issues of noise and temperature coefficient shift can be resolved.

Abstract: The present invention relates to a horn antenna device. The horn antenna device has a step-shaped signal feed-in apparatus and a conical horn antenna. The step-shaped signal feed-in apparatus has a stepped body having multiple stairs and a connecting pin. The stepped body is adapted to radiate electromagnetic waves and receive a reflection of the electromagnetic waves. According to the structure of the step-shaped signal feed-in apparatus of the invention, the resonating modes are easy to be determined. The directivity and the signal-to-noise rate are improved. In addition, the connecting pin is directly connected to the stairs for improving the signal stability of the horn antenna device.

Abstract: An FMCW radar level meter has an RF signal processing module, an intermediate frequency (IF) signal processing module, and a computation and display module. A signal generator of the RF signal processing module generates a first RF signal, which is radiated by an antenna to a measured object. The antenna received a second RF signal reflected by the measured object. The IF signal processing module processes the second RF signal and compares the first RF signal with the second RF signal. The computation and display module calculates and displays a distance between the FMCW radar level meter and the measured object. Using the RF signal processing module and the IF signal processing module to process the second RF signal, the issues of noise and temperature coefficient shift can be resolved.

Abstract: The present invention relates to a horn antenna device. The horn antenna device has a step-shaped signal feed-in apparatus and a conical horn antenna. The step-shaped signal feed-in apparatus has a stepped body having multiple stairs and a connecting pin. The stepped body is adapted to radiate electromagnetic waves and receive a reflection of the electromagnetic waves. According to the structure of the step-shaped signal feed-in apparatus of the invention, the resonating modes are easy to be determined. The directivity and the signal-to-noise rate are improved. In addition, the connecting pin is directly connected to the stairs for improving the signal stability of the horn antenna device.