JPS5542080A - Snow fall meter - Google Patents
Snow fall meterInfo
- Publication number
- JPS5542080A JPS5542080A JP11640878A JP11640878A JPS5542080A JP S5542080 A JPS5542080 A JP S5542080A JP 11640878 A JP11640878 A JP 11640878A JP 11640878 A JP11640878 A JP 11640878A JP S5542080 A JPS5542080 A JP S5542080A
- Authority
- JP
- Japan
- Prior art keywords
- seconds
- wave transmission
- wave
- time
- counter
- 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
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE: To prevent wrong operation due to noises, by detemining the time from wave transmission to wave reception in each measurement cycle, obtaining an average time t and picking out only signals received during a period from t-t1 seconds to t+t2 seconds after the wave transmission as received wave pulses.
CONSTITUTION: A counter 14 starts counting clock pulses, by t1 seconds earlier than the wave transmission. When the outputs of an averaging circuit 12 and a counter 14 have become equal to each other, the counter 14 stops counting. The time from the generation of a wave transmission control signal to the stoppage of the clock pulses is t-t1 seconds. The width of pulses, which are produced by a monostable multivibrator 16, is set at t1+t2 seconds. The rising time and falling time of a gate signal are t-t1 seconds and t+t2 seconds. A logical circuit 17 is controlled by the gate signal so that only the signals received during the period from t-t1 seconds to t+t2 seconds after the wave transmission can be picked out as normal received wave inputs.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11640878A JPS586913B2 (en) | 1978-09-20 | 1978-09-20 | snow gauge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11640878A JPS586913B2 (en) | 1978-09-20 | 1978-09-20 | snow gauge |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5542080A true JPS5542080A (en) | 1980-03-25 |
JPS586913B2 JPS586913B2 (en) | 1983-02-07 |
Family
ID=14686310
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11640878A Expired JPS586913B2 (en) | 1978-09-20 | 1978-09-20 | snow gauge |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS586913B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0341109U (en) * | 1989-08-29 | 1991-04-19 |
-
1978
- 1978-09-20 JP JP11640878A patent/JPS586913B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS586913B2 (en) | 1983-02-07 |
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