JPH0312128U - - Google Patents
Info
- Publication number
- JPH0312128U JPH0312128U JP7317889U JP7317889U JPH0312128U JP H0312128 U JPH0312128 U JP H0312128U JP 7317889 U JP7317889 U JP 7317889U JP 7317889 U JP7317889 U JP 7317889U JP H0312128 U JPH0312128 U JP H0312128U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- voltage
- frequency
- reference voltage
- outputting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims 3
- 230000010355 oscillation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Measuring Volume Flow (AREA)
Description
第１図は本考案の１実施例の構成を示すブロツ
ク図、第２図は本考案の他の実施例の構成を示す
ブロツク図、第３図は従来の渦センサの断面を示
す縦断面図、第４図は第３図に示す渦センサに接
続される変換回路を示すブロツク図、第５図は第
３図に示す渦センサの圧電素子に生じる電荷の状
態を説明する説明図、第６図は第３図に示す渦セ
ンサに発生する揚力方向のノイズを除去する構成
を説明する説明図、第７図は従来の第２の変換回
路の構成を示すブロツク図、第８図は第７図に示
す変換回路の動作を説明する特性図である。
１６，１７…圧電素子、１９，２０…チヤージ
コンバータ、２３…ローパスフイルタ、２５，４
３…シユミツトトリガ、４０，４７…コンパレー
タ、４５…周波数／電圧変換器、４６…基準電圧
源、ＳＶＯ０〜ＳＶ２，ＳＡ１…渦信号、Ｅｒ…
基準電圧、Ｓ０ｆｆ…オフ信号。
Fig. 1 is a block diagram showing the structure of one embodiment of the present invention, Fig. 2 is a block diagram showing the structure of another embodiment of the present invention, and Fig. 3 is a vertical sectional view showing the cross section of a conventional vortex sensor. , FIG. 4 is a block diagram showing a conversion circuit connected to the vortex sensor shown in FIG. 3, FIG. The figure is an explanatory diagram illustrating a configuration for removing noise in the lift direction generated in the vortex sensor shown in Figure 3, Figure 7 is a block diagram showing the configuration of a conventional second conversion circuit, and Figure 8 is a block diagram illustrating the configuration of a conventional second conversion circuit. FIG. 3 is a characteristic diagram illustrating the operation of the conversion circuit shown in the figure. 16, 17... Piezoelectric element, 19, 20... Charge converter, 23... Low pass filter, 25, 4
3... Schmitt trigger, 40, 47... Comparator, 45... Frequency/voltage converter, 46... Reference voltage source, SVO0 to SV2 , SA1 ... Eddy signal, Er...
Reference voltage, S 0 ff...off signal.
Claims (1)
手段と、この信号変換手段の出力の周波数を検出
して周波数信号として出力する周波数検出手段と
、この周波数信号を電圧信号に変換する周波数／
電圧変換手段と、前記信号変換手段の出力の振幅
を検出して振信号として出力する振幅検出手段と
、前記電圧信号と前記振幅信号とを比較し前記電
圧信号が所定値以上の状態で前記電圧信号が前記
振幅信号に対して小さいときにオフ信号を出力す
るノイズ判別手段と、前記所定値とほぼ同じ値に
設定された基準電圧を発生させれる基準電圧発生
手段と、この基準電圧と前記電圧信号とを比較し
この基準電圧より前記電圧信号が小さいときに前
記オフ信号を出力するように制御する比較手段と
、前記オフ信号のにより前記周波数検出手段の出
力周波数をオフとするゲート手段とを具備するこ
とを特徴とする渦流量変換器。 A signal conversion means for converting the measured flow rate into a vortex signal and outputting it; a frequency detection means for detecting the frequency of the output of the signal conversion means and outputting it as a frequency signal; and a frequency detection means for converting the frequency signal into a voltage signal.
voltage converting means; amplitude detecting means for detecting the amplitude of the output of the signal converting means and outputting it as an oscillation signal; comparing the voltage signal and the amplitude signal; a noise discriminator that outputs an off signal when the signal is smaller than the amplitude signal; a reference voltage generator that generates a reference voltage set to approximately the same value as the predetermined value; and the reference voltage and the voltage. a comparison means for comparing the voltage signal with a reference voltage and outputting the off signal when the voltage signal is smaller than the reference voltage; and a gate means for turning off the output frequency of the frequency detection means in response to the off signal. A vortex flow rate converter comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7317889U JPH0626814Y2 (en) | 1989-06-22 | 1989-06-22 | Vortex flow converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7317889U JPH0626814Y2 (en) | 1989-06-22 | 1989-06-22 | Vortex flow converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0312128U true JPH0312128U (en) | 1991-02-07 |
| JPH0626814Y2 JPH0626814Y2 (en) | 1994-07-20 |
Family
ID=31611773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7317889U Expired - Fee Related JPH0626814Y2 (en) | 1989-06-22 | 1989-06-22 | Vortex flow converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0626814Y2 (en) |
-
1989
- 1989-06-22 JP JP7317889U patent/JPH0626814Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0626814Y2 (en) | 1994-07-20 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |