JPS55101880A - Reflection type ultrasonic wave switch - Google Patents
Reflection type ultrasonic wave switchInfo
- Publication number
- JPS55101880A JPS55101880A JP1070479A JP1070479A JPS55101880A JP S55101880 A JPS55101880 A JP S55101880A JP 1070479 A JP1070479 A JP 1070479A JP 1070479 A JP1070479 A JP 1070479A JP S55101880 A JPS55101880 A JP S55101880A
- Authority
- JP
- Japan
- Prior art keywords
- time
- circuit
- reflected wave
- wave
- detection area
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
- G01S15/10—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves
- G01S15/18—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves wherein range gates are used
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE:To prevent malfunction due to reflected wave from the floor surface by a method wherein an object to be detected is removed from the space between the ceiling and floor for a given period of time after power is turned on so that the traveling time of wave in the space is memorized, and at the same time detection area is defined. CONSTITUTION:When power switch for ultrasonic wave switch 14 is turned on, timer circuit 5 is actuated for a specified time, output form receiver 3 is input to the memory 7 via judging circuit 6. When ultrasonic wave go-and-return time t exceeds the time t1 set previously, the circuit 6 stores it as the go-and-return time of reflected wave. At normal operation, the time t stored in the memory 7 is read, gate control circuit 9 forms gate control pulse, which closes and opens the gate circuit 10. This allows the detector 11 to receive reflected wave that comes during a definite period t3, i.e. signal by reflected wave from the object to be detected present in the detection area. This eliminates detection output due to reflected wave from the floor, so that the switching circuit 12 works only when the object 3 is present in the detection area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1070479A JPS55101880A (en) | 1979-01-31 | 1979-01-31 | Reflection type ultrasonic wave switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1070479A JPS55101880A (en) | 1979-01-31 | 1979-01-31 | Reflection type ultrasonic wave switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55101880A true JPS55101880A (en) | 1980-08-04 |
Family
ID=11757674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1070479A Pending JPS55101880A (en) | 1979-01-31 | 1979-01-31 | Reflection type ultrasonic wave switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55101880A (en) |
-
1979
- 1979-01-31 JP JP1070479A patent/JPS55101880A/en active Pending
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