Communications: electrical – Vehicle detectors – Speed and overspeed
Patent
1992-02-10
1993-10-05
Peng, John K.
Communications: electrical
Vehicle detectors
Speed and overspeed
340937, 364437, 364438, G08G 101
Patent
active
052509460
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a device called VIETEST, registered trade mark, its use and applications for estimating the influence of the environment on the behaviour of a number of persons and/or intelligent animals or conditions present or not on a body of moving body, by the measurement of the speed of the group, measured individually and sorted, preferably before and after a change in the environment.
BACKGROUND OF THE INVENTION
There exist apparatus in the field of traffic:
a speed measurer which with the aid of a Doppler effect captures the instantaneous and precise measurement of speed with the essential aim of its reduction
a measuring traffic station which shows with the aid of electromagnetic loops the average speed of a group of vehicles, the spread, the number of vehicles exceeding a speed threshold.
These materials are highly priced and inconvenient: for the first, FF50,000, and the cost of the case for the second, FF100,000 and the cost of the armour. Moreover, the procedure necessary with the second by the civil engineers costs about FF30,000 to set up for each measurement point.
OBJECTS OF THE INVENTION
The device according to the invention offers a solution which is more practical, less inconvenient, faster in its operation, more sophisticated, economical.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is representative of the device
FIG. 2 is representative of the method
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The device comprises a case (1) housed in the inside of an artificial envelope, for example, attache case, bag, case preferably provided with a handle for transport, orientation, measurement while in motion or stationary or an outliner. According to a variation, the envelope is or simulates a natural element such as a stone, or the branch of a tree.
A programmable display (3) is fixed on the case to set the chosen speed threshold, two counters (4) and (5), one indicating the number of moving bodies exceeding the programmed speed threshold and the other preferably located underneath to indicate the total number of moving bodies, the reader of the two counters instantly provides a report for example 6/35 before adjustment, 2/52 after adjustment. That is to say the approximate reduction of 17% to 4% in the exceeding of the threshold which is shown by the active second adjustment indicates a significant slowing down of 17-4=13% in the sense of better safety.
It is significant that the difference in percentage is noteworthy in that it does not require a fine precision of measure on the one hand of reduction of the number of gaps, and on the hand a total obliteration of a one sided positional distortion.
In the interior of the case are the electronic components for a Doppler effect sensor (6) or the like, an amplifier stage (7), a logic state (8) to control the counters and one or more cells or batteries (9). The sensor extends across the case and the envelope without the extra need of other items. The Doppler effect sensor delivers for every passage of movement of the body a signal of very low amplitude at a frequency which is proportional to the speed of movement of the body. This signal is applied (see FIG. 2) to an impedance adjustment circuit (10) followed by a derivative filter (11) to ensure elimination of components continuously delivered by the sensor.
A variable gain amplifier (12) increases the amplitude of the signal drawn from the pass band filter (13) the included band (100 Hz to 10000 Hz) ensuring an amplification of the useful signal. This signal is inverted by a "trigger" (14) to a variable entry threshold and the purpose of providing a signal between 0V and 5V.
The device comprises an amplification part. The following signal is oriented opposite a state called "logic". It contains 3 things. They are as follows:
a monostable (15) which the voltage time peaks at the exit are at 500 ms for example. The peaks are variable between 200 ms and 2s, dependant on the speed of the moving body at a given point. This represents the maximum passage of
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Centre d'Etudes Techniques de l'Equipment de l'Est Service Exter
Peng John K.
Ryan Matthew K.
Tong Nina
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