Device for transit time measurement and method

In a device for the transit time measurement of electric, electromagnetic and acoustic signals, particularly supersonic signals, of at least one predetermined frequency range, having a signal transmitter for the sending of measurement signals to an object and a signal receiver for receiving the measurement signals reflected by the object of a substantially predetermined frequency and having a time measuring device for determining the transit time of the measurement signals between the device and the object, from which the distance of the object from the device can be derived, the improvement comprising

• signal generator means (6) for both at least triggering the signal transmitter (10, L.sub.01) and for controlling the signal receiver (1-8),
• filter stage means (1) for tuning the signal receiver, said filter stage means being connected with said signal generator,
• said signal generator means (6) is a reference oscillator of said filter stage means,
• said filter stage means is a frequency-selective filter (1) having a phase control circuit (2),
• said filter has a phase detector (8),
• operational amplifier means (S.sub.2) has an output for feeding an output signal thereof to said phase detector (8) of said filter (1) which has said phase control circuit (2).

In a device for the transit time measurement of electric, electromagnetic and acoustic signals, particularly supersonic signals, of at least one predetermined frequency range, having a signal transmitter for the sending of measurement signals to an object and a signal receiver for receiving the measurement signals reflected by the object of a substantially predetermined frequency and having a time measuring device for determining the transit time of the measurement signals between the device and the object, from which the distance of the object from the device can be derived, the improvement comprising

• signal generator means (6) for both at least triggering the signal transmitter (10, L.sub.01) and for controlling the signal receiver (1-8),
• filter stage means (1) for tuning the signal receiver, said filter stage means being connected with said signal generator,
• said signal generator means (6) is a reference oscillator of said filter stage means,
• said filter stage means is a frequency-selective filter (1) having a phase control circuit (2),
• means for feeding a signal for frequency modulation (from 27) of a transmission signal to said reference oscillator of said filter having said phase control circuit (2) at least over a partial region of each transmission pulse sent out by said signal transmitter (19 or 21).

A device for the transit time measurement of electric, electromagnetic and acoustic signals, particularly ultrasonic signals, of at least one predetermined frequency range, having a signal transmitter for sending measurement transmission signals to an object and a signal receiver for receiving the measurement transmission signals reflected by the object, as well as a time measurement device for determining the transit time for the measurement transmission signals between the device and the object from which the distance of the object from the device can be derived, comprising

• signal generator means (6) for both at least triggering the signal transmitter (10, L.sub.01) and for controlling the signal receiver (1-8),
• filter stage means (1) for tuning the signal receiver, said filter stage means being connected with said signal generator,
• a transformer (L.sub.01) having a primary winding (10),
• at least one signal transducer connected with said transformer,
• a current generator means (25) for amplification control of the signal receiver (S.sub.1, S.sub.2, 1, 2-8),
• a clock generator stage means (12) for controlling the transmission and reception operation of the device for the transit time measurement, said clock generator means has a periodic output pulse (U.sub.aA) at least for the indirect actuation of said primary winding (16) of said transformer (L.sub.01), for triggering said current generator (25), and for at least indirect production of a starting pulse for the transit time measurement period.

A device for the transit time measurement of electric, electromagnetic and acoustic signals, and particularly ultrasonic signals of at least one predetermined frequency range, having a signal transmitter for the sending of measurement signals to an object and a signal receiver having at least one reception amplifier for the measurement signals reflected by the object and transduced by means of a signal transducer, and a time measuring device for determining the transit time of the measurement signals between the device and the object from which time the distance of the object from the device can be derived, comprising

• signal generator means (6) for both at least triggering the signal transmitter (10, L.sub.01) and for controlling the signal receiver (1-8),
• filter stage means (1) for tuning the signal receiver, said filter stage means being connected with said signal generator,
• at least one receiver amplifier (S.sub.1),
• transistors (T.sub.3, T.sub.4) and first means for control of the amplification of said at least one receiver amplifier (S.sub.1) as a function of the transit time and current, by a signal (U.sub.co3) which changes linearly over the time of the transmission pulse at least over a part of the duration, for triggering said transistors (T.sub.3, T.sub.4),
• said transistors have load circuits,
• ohmic resistances (R.sub.1, R.sub.2) connected in said load circuits of said transistors, respectively,
• base series resistors connected to the base of said transistors, respectively,
• said transistors (T.sub.3, T.sub.4) are triggered by said first means via said base series resistors,
• a semi-conductor path (D, S) is connected in parallel to one of said ohmic resistance (R.sub.L),
• said semi-conductor path (D, S) being triggered at least indirectly also by said changing signal (U.sub.co3), whereby the entire current (I.sub.S =I.sub.1 +I.sub.L +I.sub.F) through said ohmic resistances (R.sub.L, R.sub.1) and the said semi-conductor path (D, S, TS) varying in value with time resulting in a non-linear, preferably adapted logarithmic or exponential course during reception-readiness time of the measurement signal receiver (1-8).