IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0992227
(2006-09-01)
|
등록번호 |
US-8552744
(2013-10-08)
|
우선권정보 |
DE-10 2005 044 724 (2005-09-19) |
국제출원번호 |
PCT/EP2006/065937
(2006-09-01)
|
§371/§102 date |
20110926
(20110926)
|
국제공개번호 |
WO2007/033897
(2007-03-29)
|
발명자
/ 주소 |
- Michalski, Bernhard
- Buser, Dominik
- Scherr, Stefan
|
출원인 / 주소 |
- Endress + Hauser GmbH + Co. KG
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
8 |
초록
▼
An apparatus for ascertaining and monitoring a fill level and includes a transmitting/receiving unit and a delay circuit. The delay circuit includes at least a sampling clocking oscillator, which produces a sampling signal having a sampling frequency, a transmission clocking oscillator, which produc
An apparatus for ascertaining and monitoring a fill level and includes a transmitting/receiving unit and a delay circuit. The delay circuit includes at least a sampling clocking oscillator, which produces a sampling signal having a sampling frequency, a transmission clocking oscillator, which produces a pulse repetition signal having a pulse repetition frequency, and a frequency converter, which produces by means of sequential sampling a difference signal. The apparatus further includes a control/evaluation unit, which determines on the basis of travel time the fill level. Provided on the control/evaluation unit is an external clocking input, which is connected via a clocking line with a first clocking output of the sampling clocking oscillator or with a second clocking output of the transmission clocking oscillator. A stabilized and cost-favorable control circuit for producing an intermediate frequency signal with a highly accurately determinable, transformation factor results.
대표청구항
▼
1. An apparatus for ascertaining and monitoring the fill level of a fill substance in a container, comprising: a transmitting/receiving unit, which emits high-frequency, transmission signals directed at a surface of the fill substance, and which receives reflected signals,a delay circuit, which tran
1. An apparatus for ascertaining and monitoring the fill level of a fill substance in a container, comprising: a transmitting/receiving unit, which emits high-frequency, transmission signals directed at a surface of the fill substance, and which receives reflected signals,a delay circuit, which transforms the high-frequency, reflected signals and the high-frequency, transmission signals into an intermediate frequency signal, said delay circuit comprises at least a sampling clocking oscillator, which produces a sampling signal having a sampling frequency, a transmission clocking oscillator, which produces a pulse repetition signal having a pulse repetition frequency, and a frequency converter, which, by means of sequential sampling, produces from the pulse repetition signal and the sampling signal a difference signal having a frequency difference; anda control/evaluation unit, which, on the basis of travel time of the emitted, high-frequency, transmission signals and the received, high-frequency, reflected signals, determines the fill level of the fill substance in the container, wherein:provided on said control/evaluation unit is an external clocking signal input, which is connected via a clocking line with a first clocking signal output of the sampling clocking oscillators or with a second clocking signal output of said transmission clocking oscillator, so that the clocking of said control/evaluation unit is done with the sampling signal at the sampling frequency or with the pulse repetition signal with the pulse repetition frequency. 2. The apparatus as claimed in claim 1, wherein: said sampling clocking oscillator is embodied to be controllable. 3. The apparatus as claimed in claim 2, wherein: a control output is provided on said control/evaluation unit, by which said control/evaluation unit controls or triggers said sampling clocking oscillator via a control line with the help of a control input on said sampling clocking oscillator. 4. The apparatus as claimed in claim 3, further comprising: an integrating member in said control line between said control input of said sampling clocking oscillator and said control output of said control/evaluation unit, for forming from the digital control output signals of said control/evaluation unit a corresponding integral value. 5. The apparatus as claimed in claim 2, wherein: said sampling clocking oscillator is embodied as a voltage-controlled oscillator (VCO). 6. The apparatus as claimed in claim 2, wherein: said sampling clocking oscillator is embodied as a numerically controlled oscillator (NCO). 7. The apparatus as claimed in claim 1, wherein: a high accuracy, stable oscillator with a stable pulse repetition frequency (fPRF) is provided as said transmission clocking oscillator. 8. The apparatus as claimed in claim 1, wherein: said frequency converter is embodied as an analog mixer. 9. The apparatus as claimed in claim 1, wherein: said frequency converter is embodied as a digital mixer. 10. The apparatus as claimed in claim 1, wherein: provided in said clocking line between the clocking input of said control/evaluation unit and said first clocking output of said sampling clocking oscillator is a divider or a multiplier for changing, according to setting, the sampling frequency of the sampling signal.
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