CN2191437Y

CN2191437Y - Computerized autocontrol frequency selective detector

Info

Publication number: CN2191437Y
Application number: CN 94205469
Authority: CN
Inventors: 韩冬; 刘仁杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-25
Filing date: 1994-03-25
Publication date: 1995-03-08
Anticipated expiration: 2004-03-25

Abstract

The utility model relates to a portable computerized automatic control frequency selecting and geophysical prospecting detector which utilizes the natural alternating electric field to prospect the underground hydrology, the engineering geology, etc. A microcomputer is adopted as a central intelligent controller, and a liquid crystal display and a printer are provided, so that the automatic control signal collecting voltage gain and frequency selection is realized. The utility model can carry out continuous automatic detection and can also store the collected data, analyze the field data, and display and print the output. The utility model also has the functions of power down protection for data, supply voltage monitoring, etc. and has the advantages of small size low energy consumption, reliable work, convenient operation, and high work efficiency.

Description

Computerized autocontrol frequency selective detector

The utility model relates to a kind of portable microcomputer automatic control frequency-selecting measuring instrument that utilizes natural alternative electric field to carry out geophysical survey (abbreviation physical prospecting).

Utilizing the natural alternative electric field frequency-selecting method to carry out geologic prospecting is the new geophysical prospecting method that development in recent years is got up, and it is effective to have been facts have proved.At present, this type of surveying instrument mainly is to use the artificial figure signal decay of mechanical type waver to realize frequency-selecting, use reading gauge outfit or digital indicator to carry out data output, need to each measuring point carry out artificial reading when surveying in the open air, and make clerking, and carrying out indoor described point then, abnormal curve draws, carry out the data comparative analysis again, obtain the geology conclusion.This instrument can not be realized the in good time processing and the printout of select frequency automatically and data, and the data error of being gathered is bigger, and the work period is long, labour intensity is big.In addition, use a plurality of mechanical type waveres not only operate complicated, be prone to the loose contact situation, can not realize the measurement of moment to several frequency signals, influenced the same timeliness of cluster sampling.

The purpose of this utility model is to overcome the weak point of existing physical prospecting admeasuring apparatus, and a kind of portable natural alternative electric field microcomputer automatic control frequency-selecting physical prospecting admeasuring apparatus is provided.

The purpose of this utility model can adopt following measure to realize:

Microcomputer automatic control frequency-selecting physical prospecting admeasuring apparatus of the present utility model mainly comprises potential electrode probe, input stage, attenuation grade, amplification filtering level, precision rectifying level, analog to digital conversion level, microcomputer interface circuit, central controller, LCD; The output terminal of the operational amplifier U14 of its

input stage inserts

1,2,3,4 pin of the analog switch U13 of attenuation grade respectively by resistance R 2, R3, R4; Public output 3 pin of analog switch U13 are connected with input end 4 pin of the integrated circuit U12 of amplification filtering level, address port 9 pin of analog switch U13 and 10 pin then link with 37 pin and 38 pin of the integrated circuit U5 of microcomputer interface circuit, to realize the automatic control of central controller to the applied signal voltage gain; External clock input end 10 pin of the integrated circuit U12 of amplification filtering level, 11 pin insert output terminal of clock 6 pin of the integrated circuit U5 of microcomputer interface circuit, to be implemented in the select frequency automatically under the central controller controls; Input end 2 pin of output terminal 19 pin of integrated circuit U12 and the integrated circuit U11 of precision rectifying level link; Output terminal 6 pin of integrated circuit U11 are by analog input end 9 pin of the integrated circuit U7 of R13 access analog to digital conversion level, so that the frequency-selecting simulating signal is sent into the analog to digital conversion level after rectification; 1,13,10,6 pin and 3,2,5,11,14 pin of the gate circuit U6 that mark output end 12,23,27,28 pin of integrated circuit U7 and 13,14,15,16 pin insert microcomputer interface circuit are respectively inserted 21,22,23,24 pin of the integrated circuit U5 of microcomputer interface circuit again by 4,7,9,12 pin of gate circuit U6; The

position output terminal

11,18,19 of integrated circuit U7 and 20 pin then directly insert 28,27,26 and 25 pin of integrated circuit U 5 respectively; Integrated circuit U5 directly and central controller link, so that analog signal conversion is become digital signal after interface circuit is sent into central controller stores and handle; On central controller, be connected with keyboard (10) and LCD (9), and be circumscribed with printer (8) on the integrated circuit U5 of microcomputer interface circuit, to carry out man-machine conversation and demonstration in good time, measuring-signal and the response curve of printout after central controller is handled.

Central controller of the present utility model mainly is made up of single chip microcomputer U1, read-only memory U3, electric erasable memory U4, gate circuit U2, U10.

Compare with existing similar surveying instrument; the utility model is owing to adopted microsystem; can adopt microcomputor program control to replace the mechanical type waver; select frequency automatically and continuous automatic measurement have been realized; also have functions such as supply voltage monitoring, power-down data protection, also can handle, show and print the data of gathering in good time, realized the in-situ data analysis; simplify operation, improved the reliability of work efficiency and image data.The utility model volume is little, in light weight, power consumption is low, be fit to open-air the use, can be widely used in aspects such as exploration geology, underground water source, cave, coal mine gob, ancient tomb, underground pipeline, underground cable, underground discarded bombproof, city, have market outlook preferably.

The drawing of accompanying drawing is described as follows:

Fig. 1 is a theory diagram of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

The utility model is done with detailed description below with reference to embodiment (accompanying drawing):

Fig. 1 is a theory diagram of the present utility model, and wherein: M, N are the potential electrode probe, and 1 is input stage, 2 is attenuation grade, 3 is the amplification filtering level, and 4 is the precision rectifying level, and 5 is the analog to digital conversion level, 6 is microcomputer interface circuit, 7 is central controller, and 8 is printer, and 9 is LCD, 10 is keyboard, and 11 is reset circuit.

Its principle of work is: potential electrode probe M, N send the signal that collects into input stage, send into attenuation grade after amplifying; Central controller is controlled the gain voltage signal of input attenuation level automatically by interface circuit, then signal is sent into the amplification filtering level; The logical centre frequency of the band of amplifilter can realize the select frequency automatically function also by the central controller decision; Send into the precision rectifying level through amplification, frequency-selecting, filtered signal and carry out rectification, thereafter sending into the analog to digital conversion level is digital signal with analog signal conversion, further send into central controller by interface circuit again and handle in good time, store, data after will handling at last and response curve show output and printout.

Circuit structure of the present utility model as shown in Figure 2, wherein: input stage (1) is made up of operational amplifier U14, resistance R 1, capacitor C 1, has high input impedance; Analog switch U13, resistance R 2, R3, R4, R5 form automatic attenuation grade (2); Integrated circuit U12, capacitor C 2, C3, resistance R 6, R7, R8, R9, R10, R11 etc. constitute amplification filtering level (3), its enlargement factor is by the peripheral resistance decision of U12, U12 has also constituted bandpass filter simultaneously, select frequency automatically under central controller (7) control; Integrated circuit U11, diode D1, D2, capacitor C 4, C5 and resistance R 12 etc. are formed precision rectifying level (4); Integrated circuit U7, U8, U9, capacitor C 6, C7, C8, C9, C11 and resistance R 13, R14, R15, R21, R22 etc. form analog to digital conversion level (5); Integrated circuit U5, U6 constitute emblem interface circuit (6); Integrated circuit U1, U2, U3, U4, U10 etc. constitute single-chip microprocessor system, play central controller (7) effect in whole instrument; Wherein U1 is that single-chip microcomputer, U3 are that read-only memory, U4 are the electric erasable memories; Integrated circuit U15, diode D3, capacitor C 10.Resistance R 16 and button S1 constitute reset circuit; Integrated circuit U16, diode D4, D5, resistance R 17, R18, R19, R20, etc. form supply voltage monitoring circuit; 8 is printer, and 9 is that LCD, 10 is keyboard.

The output terminal of the operational amplifier U14 of input stage (1)

inserts input end

1,2,3,4 pin of the analog switch U13 of attenuation grade (2) respectively by R2, R3, R4, the potential electrode signal that M, N gather of popping one's head in is sent into attenuation grade (2) after amplifying.4 pin of public output 3 pin of analog switch U13 and the integrated circuit U12 of amplification filtering level (3) link, address port 9 pin of analog switch U13 and 10 pin then connect with 37 pin and 38 pin of the integrated circuit U5 of microcomputer interface circuit (6), make attenuation grade be subjected to the control of central controller (7), thereby realize automatic control the applied signal voltage gain.External clock input end 10 pin of the integrated circuit U12 of amplification filtering level (3), 11 pin connect with output terminal of clock 6 pin of the integrated circuit U5 of microcomputer interface circuit (6), at this moment, integrated circuit U12 has constituted bandpass filter, its centre frequency is by central controller (7) control, thus the realization select frequency automatically; Output terminal 19 pin of integrated circuit U12 will be sent into precision rectifying level (4) through the frequency-selecting signal of frequency-selecting amplification filtering and carry out rectification by input end 2 pin that R12 inserts precision rectifying level (4) integrated circuit U11.Output terminal 6 pin of integrated circuit U11 link through analog input end 9 pin of the integrated circuit U7 of R13 and analog to digital conversion level (5).Be connected to pedestal generator U8 on the reference voltage terminal of integrated circuit U7, U8 provides reference power supply by integrated circuit; Mark output end 12,23,27,28 pin of integrated circuit U7 and 13,14,15,16 pin are 1,13,10,6 pin and 3,2,5,11,14 pin of the gate circuit U6 of access interface circuit (6) respectively, are inserted 21,22,23,24 pin of integrated circuit U 5 again by 4,7,9, the 12 pin output of gate circuit U6; The

position output terminal

11,18,19 of integrated circuit U7 and 20 pin then directly insert 28,27,26 and 25 pin of integrated circuit U 5 respectively; Integrated circuit U5 directly connects with central controller (7), the frequency-selecting analog signal conversion is become digital signal after interface circuit is sent into central controller handles and store.On the integrated circuit U5 of interface circuit (6), be circumscribed with printer (8), with data and the response curve of in good time printing after acquisition process.Be connected to LCD (9) in the outside of central controller (7), can show data and response curve after acquisition process in good time.Reset circuit (11) is connected on the integrated circuit U1 of LCD (9) and central controller.Central controller (7) outside also is associated with keyboard (10), in order to realize man-machine conversation.The V+ end of circuit voltage observation circuit connects with the V+ end of the V+ end of amplification filtering level (3) and precision rectifying level (4).

The integrated circuit inventory that is adopted in the utility model is as follows:

U1 is that model is 8031 one chip microcomputer; U2 is that model is the gate circuit of 74LS373; U3 is that model is 2764 ROM (read-only memory); U4 is that model is 2864 electricity erasable memorizer; U5 is that model is 8155 interface circuit; U6 is that model is the gate circuit of 74LS157; U7 is that model is 7135 A/D converter; U8 is that model is 1403 reference power supply; U9 is that model is 4069 gate circuit; U10 is that model is the gate circuit of GAL16V8; U11 is that model is the AC/DC changeover switch of LM736; U12 is that model is the switching capacity filter of MF10; U13 is that model is 4052 gate circuit; U14 is that model is the operational amplifier of OP-07; U15 is that model is the gate circuit of 74LS14; U16 is that model is four comparers of LM339; The 9th, model is the LCD of DMF5005N; The 8th, model is the mini-printer of TP μ P-40.

Claims

1, a kind of microcomputer automatic control frequency-selecting physical prospecting admeasuring apparatus, it comprises potential electrode probe, input stage, attenuation grade, amplification filtering level, precision rectifying level, analog to digital conversion level, microcomputer interface circuit, central controller, LCD, it is characterized in that:

The output terminal of the operational amplifier U14 of input stage inserts 1,2,3,4 pin of the analog switch U13 of attenuation grade respectively by resistance R 2, R3, R4;

Input end 4 pin of public output 3 pin of analog switch U13 and the integrated circuit U12 of amplification filtering level link, and address port 9 pin of analog switch U13 and 10 pin then link with 37 pin and 38 pin of the integrated circuit U5 of microcomputer interface circuit;

External clock input end 10 pin of the integrated circuit U12 of amplification filtering level, 11 pin insert output terminal of clock 6 pin of the integrated circuit U5 of microcomputer interface circuit, to be implemented in the select frequency automatically under the central controller controls; Input end 2 pin of output terminal 19 pin of integrated circuit U12 and the integrated circuit U11 of precision rectifying level link;

Output terminal 6 pin of integrated circuit U11 insert analog input end 9 pin of the integrated circuit U7 of analog to digital conversion level by R13;

1,13,10,6 pin and 3,2,5,11,14 pin of the gate circuit U6 that mark output end 12,23,27,28 pin of integrated circuit U7 and 13,14,15,16 pin insert microcomputer interface circuit are respectively inserted 21,22,23,24 pin of the integrated circuit U5 of microcomputer interface circuit again by 4,7,9,12 pin of gate circuit U6; The position output terminal 11,18,19 of integrated circuit U7 and 20 pin then directly insert 28,27,26 and 25 pin of integrated circuit U 5 respectively; Integrated circuit U5 directly and central controller link;

On central controller, be connected with keyboard (10) and LCD (9), and be circumscribed with printer (8) on the integrated circuit U5 of microcomputer interface circuit.

2, microcomputer select frequency automatically physical prospecting admeasuring apparatus according to claim 1 is characterized in that central controller is made up of single chip microcomputer U1, read-only memory U3, electric erasable memory U4, gate circuit U2, U10.