CN2449244Y - Multi-range processing circuit for radar liquid level meter - Google Patents
Multi-range processing circuit for radar liquid level meter Download PDFInfo
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- CN2449244Y CN2449244Y CN 00267568 CN00267568U CN2449244Y CN 2449244 Y CN2449244 Y CN 2449244Y CN 00267568 CN00267568 CN 00267568 CN 00267568 U CN00267568 U CN 00267568U CN 2449244 Y CN2449244 Y CN 2449244Y
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Abstract
The utility model relates to a multi-range processing circuit device for a radar liquid level meter, which comprises three measuring range parts of a short range, a medium range and a long range. The three measuring range parts of a short range, a medium range and a long range are respectively attached with a corresponding high pass filter of a cutoff frequency, and the filtering amplification parts of the three measuring range parts of a short range, a medium range and a long range are respectively composed of U1: A, U1: B and U2: A; U2: B and U3: A; U3: B and U4: A. The multi-range processing circuit device is also provided with a switching circuit and has the advantages that the dimension of an antenna is reduced greatly, the cost and the weight of the antenna are also reduced, and the installation and the transport are convenient. The utility model also has the advantages of stable operation, reliable performance and long lifetime.
Description
A kind of all closely devices of range radar that relate to refer in particular to a kind of radar level gauge branch journey processing circuit unit, should be divided into the G01S group in International Patent Classification (IPC).
As everyone knows, radar level gauge belongs to closely range radar.Closely range radar inevitably will run into the discontinuous place of radar self microwave channel, for example microstrip line and coaxial cable switching place, coaxial cable is to waveguide switching place, waveguide all can produce the standing wave reflection to loudspeaker switching place and loudspeaker end face, even standing-wave ratio is transferred very for a short time, its reflected energy comes much bigger far away compared with the energy of spatial obstacle thing reflected back, therefore must carry out the degree of depth to the reflection of radar self suppresses, otherwise can cause the saturated of receiving cable and lose detectability weak signal, but when reflected signal is carried out degree of depth inhibition, closely signal also can be subjected to inhibition to a certain degree, in order to remedy the inhibition of short range signal, the external at present way that adopts is to strengthen antenna aperture, promptly adopt the antenna of different gains at different maximum distances, for example when require to see 30 meters apart from the time, antenna aperture reaches 450mm.Therefore the size and the weight of antenna are bigger, and closely range radar inevitably also wants heavy certainly.
For solve radar level gauge measure short range and long-range between contradiction, in radar level gauge, adopted branch journey processing circuit unit, its objective is and use small-bore antenna to see closely to see again 30 meters remote.
The technical scheme that realizes above-mentioned purpose is as follows: the journey processing circuit unit comprised short range, intermediate range, long-range three range sections in described minute.Described short range, intermediate range, long-range three range sections respectively have the Hi-pass filter of corresponding cutoff frequency.The filtering amplifier section of described short range, intermediate range, long-range three ranges is respectively by U1:A, U1:B and U2:A; U2:B and U3:A; U3:B and U4:A constitute.The journey processing circuit unit had an on-off circuit in described minute.The output of described short range filtering amplifier section U1:A, U1:B and U2:A connects 12 pin of on-off circuit, and the output of intermediate range filtering amplifier section U2:B and U3:A connects 14 pin of on-off circuit, and the output of long-range filtering amplifier section U3:B and U4:A connects 9 pin of on-off circuit; Be subjected to the output of output terminal-10 pin of A1-3 pin and A2-4 foot control system to be respectively: when A1, A2 are low level, on-off circuit output short range signal; When A1 be high level, when A2 is low level, on-off circuit output intermediate range signal; When A2 is high level, on-off circuit output remote signal.The model of described on-off circuit is AD7512D.4 rank are adopted in short range filtering, and cutoff frequency is the Butterworth Hi-pass filter of 2KHz; 2 rank are adopted in intermediate range and long-range filtering, and cutoff frequency is respectively the Butterworth Hi-pass filter of 7.5KHz and 15KHz.The suppressing portion of the radar of intermediate range self reflection is divided into the wave filter of short range and intermediate range, and the suppressing portion of long-range radar self reflection is divided into short range, intermediate range and three long-range wave filters.Conversion was arranged on 3.6 meters when range changeed intermediate range by short range, and conversion being arranged on 3.4 meters when range changeed short range by intermediate range, and conversion being arranged on 15.1 meters when range changeed long-range by intermediate range, range during by long-range commentaries on classics intermediate range conversion be arranged on 14.9 meters.
Below in conjunction with drawings and Examples radar level gauge branch journey processing circuit unit is further specified, wherein:
Fig. 1 is liquid level instrument microwave part and front stage circuits block scheme.
Fig. 2 divides the relative position figure of journey processing circuit unit in radar level gauge for radar level gauge.Wherein shown radar level gauge branch journey processing circuit unit is disclosed with the form of circuit block diagram.
Fig. 3 divides the particular circuit configurations figure of journey processing circuit unit for radar level gauge.
In Fig. 1, A represents directed coupling device, and B represents circulator, and C represents microstrip line, and D represents coaxial cable, and E represents electromagnetic horn, and F represents waveguide.Help in Fig. 1 to understand closely that range radar inevitably will run into the discontinuous place of radar self microwave channel, for example microstrip line and coaxial cable switching place, coaxial cable all can produce the situation of standing wave reflection to loudspeaker switching place and loudspeaker end face to waveguide switching place, waveguide.Radar level gauge divides the relative position of journey processing circuit unit in radar level gauge as seen from Figure 2.FCC in the big square frame represents branch journey treatment circuit, and KG represents gauge tap.The most important thing is accompanying drawing 3, the figure shows the particular circuit configurations figure of radar level gauge branch journey processing circuit unit.As shown in Figure 3, its range is divided into short range, intermediate range, long-range, and each range adopts the Hi-pass filter of different cutoff frequencys, and the segmentation of range can be provided with as the case may be flexibly, and the cutoff frequency of wave filter can adjust accordingly thereupon.Short range and intermediate range segmentation can be arranged on 3.5 meters, intermediate range and remote segment are arranged on 15 meters.Among Fig. 3, U1:A, U1:B and U2:A; U2:B and U3:A; U3:B and U4:A constitute short range, intermediate range and long-range filtering respectively and amplify, their output connects 12 pin, 14 pin and 9 pin of on-off circuit AD7512D respectively, and the output of on-off circuit (10 pin) is subjected to the control of A1 (3 pin) and A2 (4 pin), when A1, A2 are low level, on-off circuit output short range signal; When A1 be high level, when A2 is low level, on-off circuit output intermediate range signal; When A2 is high level, on-off circuit output remote signal.4 rank are adopted in short range filtering, and cutoff frequency is the Butterworth Hi-pass filter of 2KHz; 2 rank are adopted in intermediate range and long-range filtering, and cutoff frequency is respectively the Butterworth Hi-pass filter of 7.5KHz and 15KHz.It can also be seen that from Fig. 3 the wave filter that the suppressing portion of the radar of intermediate range self reflection is divided into short range and intermediate range works simultaneously, the suppressing portion of long-range radar self reflection is divided into short range, intermediate range and three long-range wave filter actings in conjunction.Along with the change inhibition of range is more and more darker, in concrete the application, the conversion of range is carried out in an interval, conversion was arranged on 3.6 meters when range changeed intermediate range by short range, conversion was arranged on 3.4 meters when range changeed short range by intermediate range, conversion was arranged on 15.1 meters when range changeed long-range by intermediate range, range during by long-range commentaries on classics intermediate range conversion be arranged on 14.9 meters.
The advantage of Multi-range processing circuit for radar liquid level meter is very obvious. When radar is in short range, Only consider the scope that belongs to short range is had an optimistic view of, and do not consider intermediate range and long-range whether good, this moment is because short range Signal with respect in, remote signal is eager to excel, therefore the reflection to radar self suppresses to require relatively low, right The short range signal of required observation can not bring loss; Equally, when long-range, only consider belonging to long-range distance From good, and do not consider whether short range and intermediate range can be had an optimistic view of, because a little less than the long-range echo-signal, can be to radar The reflection of self is carried out the degree of depth and is suppressed, to guarantee the reliable detection of long-range weak signal. If do not take branch journey place Reason must be when considering good long-range echo, will consider that also short range can have an optimistic view of, and will have an optimistic view of long-range just necessary The degree of depth suppresses the reflection of radar self, and this will bring impact to the short range signal, so have to strengthen antenna gain Remedy the loss of short range signal, and the branch journey detection short range and long-range contradiction have just thoroughly been solved after processing. Adopt Get Multi-range processing circuit for radar liquid level meter, the size of antenna is greatly reduced, the size of radar level gauge Also decrease; The reduction of antenna size has also reduced the weight of antenna cost and antenna thereupon, gives and installs Bring great convenience with transportation; The other advantage of this Multi-range processing circuit for radar liquid level meter is that work is steady Fixed, dependable performance, life-span are long.
Claims (9)
1. a radar level gauge divides the journey processing circuit unit, it is characterized in that: the journey processing circuit unit comprised short range, intermediate range, long-range three range sections in described minute.
2. radar level gauge according to claim 1 divides the journey processing circuit unit, it is characterized in that: described short range, intermediate range, long-range three range sections respectively have the Hi-pass filter of corresponding cutoff frequency.
3. radar level gauge according to claim 1 divides the journey processing circuit unit, it is characterized in that: the filtering amplifier section of described short range, intermediate range, long-range three ranges is respectively by U1:A, U1:B and U2:A; U2:B and U3:A; U3:B and U4:A constitute.
4. radar level gauge according to claim 1 divides the journey processing circuit unit, it is characterized in that: the journey processing circuit unit had an on-off circuit in described minute.
5. divide the journey processing circuit unit according to claim 1,3,4 described radar level gauges, it is characterized in that: the output of described short range filtering amplifier section U1:A, U1:B and U2:A connects 12 pin of on-off circuit, the output of intermediate range filtering amplifier section U2:B and U3:A connects 14 pin of on-off circuit, and the output of long-range filtering amplifier section U3:B and U4:A connects 9 pin of on-off circuit; Be subjected to the output of output terminal-10 pin of A1-3 pin and A2-4 foot control system to be respectively: when A1, A2 are low level, on-off circuit output short range signal; When A1 be high level, when A2 is low level, on-off circuit output intermediate range signal; When A2 is high level, on-off circuit output remote signal.
6. radar level gauge according to claim 4 divides the journey processing circuit unit, it is characterized in that: the model of described on-off circuit is AD7512D.
7. radar level gauge according to claim 3 divides the journey processing circuit unit, it is characterized in that: 4 rank are adopted in short range filtering, and cutoff frequency is the Butterworth Hi-pass filter of 2KHz; 2 rank are adopted in intermediate range and long-range filtering, and cutoff frequency is respectively the Butterworth Hi-pass filter of 7.5KHz and 15KHz.
8. radar level gauge according to claim 1 divides the journey processing circuit unit, it is characterized in that: the suppressing portion of the radar of intermediate range self reflection is divided into the wave filter of short range and intermediate range, and the suppressing portion of long-range radar self reflection is divided into short range, intermediate range and three long-range wave filters.
9. radar level gauge according to claim 1 divides the journey processing circuit unit, it is characterized in that: conversion was arranged on 3.6 meters when range changeed intermediate range by short range, conversion was arranged on 3.4 meters when range changeed short range by intermediate range, conversion was arranged on 15.1 meters when range changeed long-range by intermediate range, range during by long-range commentaries on classics intermediate range conversion be arranged on 14.9 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00267568 CN2449244Y (en) | 2000-12-25 | 2000-12-25 | Multi-range processing circuit for radar liquid level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00267568 CN2449244Y (en) | 2000-12-25 | 2000-12-25 | Multi-range processing circuit for radar liquid level meter |
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| Publication Number | Publication Date |
|---|---|
| CN2449244Y true CN2449244Y (en) | 2001-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00267568 Expired - Lifetime CN2449244Y (en) | 2000-12-25 | 2000-12-25 | Multi-range processing circuit for radar liquid level meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI760808B (en) * | 2020-08-04 | 2022-04-11 | 何忠誠 | Radar distance detection device and method |
-
2000
- 2000-12-25 CN CN 00267568 patent/CN2449244Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI760808B (en) * | 2020-08-04 | 2022-04-11 | 何忠誠 | Radar distance detection device and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20101225 Granted publication date: 20010919 |