Ultrasonic vehicle rangefinder

Patent · Tue Jun 30 00:00:00 EDT 1987

OSTI ID:6192505

Obayashi, H; Kobayashi, H; Takeuchi, K

An ultrasonic rangefinder is described comprising: an oscillator for intermittently generating high frequency signals; a transmitter microphone for emitting an ultrasonic pulse toward a target object when the high frequency signals are received from the oscillator; a receiver microphone for receiving an ultrasonic pulse reflected from the target object; means for measuring the time difference between transmitted and received pulses; means for detecting attenuation vibrations generated in the transmitter microphone after the high frequency signals have been input into the transmitter microphone; means for distinguishing between a malfunction in the rangefinder on a transmission side or a reception side based on the output from the detecting means; the detecting means comprising a switching means for disconnecting the oscillator from the distinguishing means when high frequency signals from the oscillator are input into transmitter microphone.

• Assignee: Nissan Motor Co., Ltd., Yokohama
• Patent Number(s): US 4677595
• OSTI ID: 6192505
• Resource Relation: Patent File Date: Filed date 3 Oct 1984
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
VEHICLES
RANGE FINDERS
DATA TRANSMISSION SYSTEMS
FREQUENCY DEPENDENCE
MECHANICAL VIBRATIONS
OSCILLATORS
PULSE TECHNIQUES
PULSES
REFLECTION
SIGNALS
SWITCHING CIRCUITS
TIME MEASUREMENT
TIMING CIRCUITS
ULTRASONIC WAVES
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
MEASURING INSTRUMENTS
SOUND WAVES
320203* - Energy Conservation
Consumption
& Utilization- Transportation- Land & Roadway