Interface circuit for oil product interface intelligent detector and signal processing method
An interface circuit and signal processing technology, which is applied to the data transmission and processing of oil interface intelligent detectors, and the field of sequential oil delivery detection equipment, can solve the problems of unstable operation of the interface circuit, complex circuit structure, and difficult detection, so as to improve detection The effect of precision and accuracy, simple circuit structure, and strong anti-interference ability
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Embodiment 1
[0056] Embodiment 1: The present invention is applied to the interface circuit of the oil interface intelligent detector
[0057] The invention provides an interface circuit for an intelligent oil interface detector, which is used to solve the problems that the circuit structure is too complicated and the operation of the interface circuit is unstable when the existing interface circuit is applied to the oil interface intelligent detector.
[0058] An interface circuit applied to an oil interface intelligent detector proposed by an embodiment of the present invention, the interface circuit includes an AD interface circuit, a DA interface circuit, a communication interface and a power supply interface;
[0059] The AD interface circuit is used for the connection of the AD conversion circuit;
[0060] The DA interface circuit is used for the connection of the DA converter;
[0061] The communication interface is used for RS-485 serial bus connection;
[0062] The power interfa...
Embodiment 2
[0072] Embodiment 2: The present invention is applied to the output signal calibration method of the oil interface intelligent detector
[0073] The light intensity reflected back by the probe is different in different media, so the signal measurement value (I / V) is also different. For example, put the probe into water, 95# gasoline, 92# gasoline, 98# gasoline and 0# diesel, The test data is as shown in Table 1, and the interface circuit of the present invention is used to directly output the signal, and the calculated output percentage is as shown in Table 1:
[0074] Table 1 Media original test data and output percentage
[0075] medium Raw signal (V) Original percentage (%) water 4.29 95 95# gasoline 2.32 42 92# gasoline 2.06 35 98# gasoline 2.01 33 0# diesel 0.94 5
[0076] It can be seen from the above table that the output percentage difference between 92# and 98# gasoline is very small, which is not conducive to clear...
Embodiment 3
[0085] Embodiment 3: The signal automatic gain adjustment method applied to the oil interface intelligent detector
[0086] The invention provides an automatic signal gain adjustment method applied to an oil interface intelligent detector. When the length of the optical fiber from the probe of the oil interface intelligent detector to the interface circuit is greater than 2km and the output signal is less than 0.8V, the signal automatic gain adjustment method is used , the signal automatic gain adjustment method includes the following steps:
[0087] (1) Initialize the ADC chip first, then configure the AD gain, G=1, s_Flag=1.
[0088] (2) Collect the optical fiber return signal, collect 10 in total, and collect once every 30mS.
[0089] (3) Use the median average filtering method to obtain V0 for the collected 10 values.
[0090] (4) Judgment If s_Flag=0, then display signal V.
[0091](5) If s_Flag is not equal to 0, V0<0.25V, configure AD gain, G=16, s_Flag=0; 0.25V
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Abstract
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