| 摘要 |
The apparatus employs transmission and reflection of sonic impulses in water to detect foreign objects. A matrix sequentially and successively primes, individually and at a prescribed rate, each of a plurality of bulbs commencing with transmission of each pulse. Detection of a reflected pulse energizes the bulbs at the time of reception of such pulse. Since the rate of sequencing of the bulbs is fixed and the rate of transmission of sound in water is a constant, depth is indicated by the bulb illuminated by the reflected pulse. Range switching is accomplished by changing in discrete increments the rate of sequencing of the matrix. A one-shot multivibrator is employed to energize the bulbs to insure uniform illumination in spite of large variations in reflected energy.
|
