CN104596648A - High-sensitivity infrared detection system - Google Patents
High-sensitivity infrared detection system Download PDFInfo
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- CN104596648A CN104596648A CN201410658936.3A CN201410658936A CN104596648A CN 104596648 A CN104596648 A CN 104596648A CN 201410658936 A CN201410658936 A CN 201410658936A CN 104596648 A CN104596648 A CN 104596648A
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Abstract
The invention discloses a high-sensitivity infrared detection system. The high-sensitivity infrared detection system is characterized by being formed by a sensor U, a power circuit, a two-stage low-pass filtering and amplifying circuit, a comparison circuit and a conversion circuit; the power circuit and the two-stage low-pass filtering and amplifying circuit are connected with the sensor U; the comparison circuit is connected with the two-stage low-pass filtering and amplifying circuit; the conversion circuit is connected with the comparison circuit and the power circuit; the two-stage low-pass filtering and amplifying circuit is formed by an amplifier P1, an amplifier P2, a capacitor C1, a resistor R1 and the like; a positive electrode and a negative electrode of the capacitor C1 are connected with the sensor U; one end of the resistor R1 is connected with the positive electrode of the capacitor C1; the other end of the resistor R1 is connected with a positive phase input end of the amplifier P1. According to the high-sensitivity infrared detection system, the detection system can be high in receiving sensitivity and high in response due to the double-element type pyroelectric infrared sensor and meanwhile a weak frequency signal received by the sensor can be amplified through the two-stage low-pass filtering and amplifying circuit in an undistorted mode and accordingly the detection result of the detection system can be accurate.
Description
Technical field
The present invention relates to electronic applications, specifically refer to a kind of highly sensitive IR detection system.
Background technology
There is the advantage of its uniqueness due to infrared detection technique thus make it obtain investigation and application widely in military and national defense and civil area, especially under the traction of military requirement and the promotion of correlation technique development, infrared detection technique as new and high technology will be more extensive in the application in future, and status is more important.
Infrared eye sightless infrared energy is transformed into the energy transfer machine that other is easy to the form of energy measured, current infra-red detection is with through being widely used in the middle of people live, the infra-red thermometer commonly used as people uses infra-red detection technology exactly, and it brings and very large makes profit.But current used IR detection system sensitivity is not high and result of detection is not accurate, easily makes people cause erroneous judgement.
Summary of the invention
The object of the invention is to overcome the high and result of detection of current IR detection system sensitivity water not defect accurately, provide a kind of and react fast, that accuracy is high high sensitivity IR detection system.
The following technical scheme of object of the present invention realizes: a kind of highly sensitive IR detection system, by sensor U, all be connected with sensor U the power circuit connect and two-stage low-pass filtering amplifying circuit, be connected with two-stage low-pass filtering amplifying circuit ground connection comparator circuit, forms with the change-over circuit that comparator circuit is connected with power circuit simultaneously, described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, the electric capacity C1 that negative pole and positive pole are all connected with sensor U, one end is connected with the positive pole of electric capacity C1, the resistance R1 that the other end is then connected with the normal phase input end of amplifier P1, negative pole is connected with the negative pole of electric capacity C1, the electric capacity C2 that positive pole is connected with the inverting input of amplifier P1 after resistance R2, be serially connected in the electric capacity C3 between amplifier P1 inverting input and output terminal, negative pole is connected with the output terminal of amplifier P1, the electric capacity C4 that positive pole is connected with the inverting input of amplifier P2 after resistance R3, the resistance R4 be in parallel with resistance R3, and positive pole is connected with the inverting input of amplifier P2, the electric capacity C5 that negative pole is connected with the output terminal of amplifier P2 forms, the normal phase input end of described amplifier P2 is all connected with comparator circuit with output terminal.
Further, described power circuit is by triode Q1, and electric capacity C6, electric capacity C7, resistance R5, resistance R6 form; The emitter of triode Q1 is connected with sensor U, its base stage ground connection, its collector after electric capacity C6 are connected with power supply after resistance R6, and the positive pole of electric capacity C7 is connected with the collector of triode Q1 after resistance R5, minus earth.
Described comparator circuit is by amplifier P3, amplifier P4, triode Q2, the resistance R7 that one end is connected with the normal phase input end of amplifier P2, the other end is then connected with the normal phase input end of amplifier P3, the diode D1 that P pole is connected with the emitter of triode Q2, N pole is connected with the normal phase input end of amplifier P4, be serially connected in the electric capacity C8 between the inverting input of amplifier P4 and output terminal, one end is connected with the output terminal of amplifier P4, resistance R9 that the other end is connected with the output terminal of amplifier P3 after resistance R8 forms; The base stage of described triode Q2 is connected with the output terminal of amplifier P2, collector is connected with the inverting input of amplifier P3, and resistance R8 is connected with change-over circuit with the tie point of resistance R9.
Described change-over circuit comprises amplifier P5, amplifier P6, diode D2, resistance R10; The P pole of diode D2 is connected with the output terminal of amplifier P5, N pole is connected with the normal phase input end of amplifier P6, the normal phase input end of amplifier P5 is connected with resistance R6, inverting input is connected with the tie point of resistance R9 with resistance R8, inverting input ground connection after resistance R10 of amplifier P6.
Described sensor U is the pyroelectric infrared sensor of dual-element type.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the present invention adopts the pyroelectric infrared sensor of dual-element type, make the receiving sensitivity of detection system higher, reaction faster.
(2) the present invention is provided with two-stage low-pass filtering amplifying circuit, the distortionless amplification of Weak frequency signal that it can receive sensor, thus makes the testing result of detection system more accurate.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, high sensitivity IR detection system of the present invention, by sensor U, all be connected with sensor U the power circuit connect and two-stage low-pass filtering amplifying circuit, be connected with two-stage low-pass filtering amplifying circuit ground connection comparator circuit, forms with the change-over circuit that comparator circuit is connected with power circuit simultaneously.In order to make the sensitivity of detection system Signal reception to external world higher, sensor U of the present invention adopts the pyroelectric infrared sensor of dual-element type.
Wherein, two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, the electric capacity C1 that negative pole and positive pole are all connected with sensor U, one end is connected with the positive pole of electric capacity C1, the resistance R1 that the other end is then connected with the normal phase input end of amplifier P1, negative pole is connected with the negative pole of electric capacity C1, the electric capacity C2 that positive pole is connected with the inverting input of amplifier P1 after resistance R2, be serially connected in the electric capacity C3 between amplifier P1 inverting input and output terminal, negative pole is connected with the output terminal of amplifier P1, the electric capacity C4 that positive pole is connected with the inverting input of amplifier P2 after resistance R3, the resistance R4 be in parallel with resistance R3, and positive pole is connected with the inverting input of amplifier P2, the electric capacity C5 that negative pole is connected with the output terminal of amplifier P2 forms, the normal phase input end of described amplifier P2 is all connected with comparator circuit with output terminal.By the effect of two-stage low-pass filtering amplifying circuit, the distortionless amplification of Weak frequency signal that sensor can be received, thus make the testing result of detection system more accurate.
In addition, power circuit processes the voltage being supplied to detection system, makes it meet the needs of system.It is by triode Q1, electric capacity C6, electric capacity C7, resistance R5, and resistance R6 forms; The emitter of triode Q1 is connected with sensor U, its base stage ground connection, its collector after electric capacity C6 are connected with power supply after resistance R6, and the positive pole of electric capacity C7 is connected with the collector of triode Q1 after resistance R5, minus earth.
Comparator circuit is by amplifier P3, amplifier P4, triode Q2, the resistance R7 that one end is connected with the normal phase input end of amplifier P2, the other end is then connected with the normal phase input end of amplifier P3, the diode D1 that P pole is connected with the emitter of triode Q2, N pole is connected with the normal phase input end of amplifier P4, be serially connected in the electric capacity C8 between the inverting input of amplifier P4 and output terminal, one end is connected with the output terminal of amplifier P4, resistance R9 that the other end is connected with the output terminal of amplifier P3 after resistance R8 forms; The base stage of described triode Q2 is connected with the output terminal of amplifier P2, collector is connected with the inverting input of amplifier P3, and resistance R8 is connected with change-over circuit with the tie point of resistance R9.
Change-over circuit converts electric signal to infrared energy and exports, and it comprises amplifier P5, amplifier P6, diode D2, resistance R10; The P pole of diode D2 is connected with the output terminal of amplifier P5, N pole is connected with the normal phase input end of amplifier P6, the normal phase input end of amplifier P5 is connected with resistance R6, inverting input is connected with the tie point of resistance R9 with resistance R8, inverting input ground connection after resistance R10 of amplifier P6.
As mentioned above, just well the present invention can be realized.
Claims (5)
1. a highly sensitive IR detection system, it is characterized in that: by sensor U, all be connected with sensor U the power circuit connect and two-stage low-pass filtering amplifying circuit, be connected with two-stage low-pass filtering amplifying circuit ground connection comparator circuit, forms with the change-over circuit that comparator circuit is connected with power circuit simultaneously, described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, the electric capacity C1 that negative pole and positive pole are all connected with sensor U, one end is connected with the positive pole of electric capacity C1, the resistance R1 that the other end is then connected with the normal phase input end of amplifier P1, negative pole is connected with the negative pole of electric capacity C1, the electric capacity C2 that positive pole is connected with the inverting input of amplifier P1 after resistance R2, be serially connected in the electric capacity C3 between amplifier P1 inverting input and output terminal, negative pole is connected with the output terminal of amplifier P1, the electric capacity C4 that positive pole is connected with the inverting input of amplifier P2 after resistance R3, the resistance R4 be in parallel with resistance R3, and positive pole is connected with the inverting input of amplifier P2, the electric capacity C5 that negative pole is connected with the output terminal of amplifier P2 forms, the normal phase input end of described amplifier P2 is all connected with comparator circuit with output terminal.
2. the highly sensitive IR detection system of one according to claim 1, is characterized in that: described power circuit is by triode Q1, and electric capacity C6, electric capacity C7, resistance R5, resistance R6 form; The emitter of triode Q1 is connected with sensor U, its base stage ground connection, its collector after electric capacity C6 are connected with power supply after resistance R6, and the positive pole of electric capacity C7 is connected with the collector of triode Q1 after resistance R5, minus earth.
3. the highly sensitive IR detection system of one according to claim 2, it is characterized in that: described comparator circuit is by amplifier P3, amplifier P4, triode Q2, one end is connected with the normal phase input end of amplifier P2, the resistance R7 that the other end is then connected with the normal phase input end of amplifier P3, P pole is connected with the emitter of triode Q2, the diode D1 that N pole is connected with the normal phase input end of amplifier P4, be serially connected in the electric capacity C8 between the inverting input of amplifier P4 and output terminal, one end is connected with the output terminal of amplifier P4, the resistance R9 that the other end is connected with the output terminal of amplifier P3 after resistance R8 forms, the base stage of described triode Q2 is connected with the output terminal of amplifier P2, collector is connected with the inverting input of amplifier P3, and resistance R8 is connected with change-over circuit with the tie point of resistance R9.
4. the highly sensitive IR detection system of one according to claim 3, is characterized in that: described change-over circuit comprises amplifier P5, amplifier P6, diode D2, resistance R10; The P pole of diode D2 is connected with the output terminal of amplifier P5, N pole is connected with the normal phase input end of amplifier P6, the normal phase input end of amplifier P5 is connected with resistance R6, inverting input is connected with the tie point of resistance R9 with resistance R8, inverting input ground connection after resistance R10 of amplifier P6.
5. the highly sensitive IR detection system of one according to claim 4, is characterized in that: described sensor U is the pyroelectric infrared sensor of dual-element type.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410658936.3A CN104596648A (en) | 2014-11-18 | 2014-11-18 | High-sensitivity infrared detection system |
| CN201510310427.6A CN104864967A (en) | 2014-11-18 | 2015-06-08 | High-sensitivity mirror type voltage stabilizing oscillation infrared detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410658936.3A CN104596648A (en) | 2014-11-18 | 2014-11-18 | High-sensitivity infrared detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104596648A true CN104596648A (en) | 2015-05-06 |
Family
ID=53122579
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410658936.3A Pending CN104596648A (en) | 2014-11-18 | 2014-11-18 | High-sensitivity infrared detection system |
| CN201510310427.6A Withdrawn CN104864967A (en) | 2014-11-18 | 2015-06-08 | High-sensitivity mirror type voltage stabilizing oscillation infrared detection system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510310427.6A Withdrawn CN104864967A (en) | 2014-11-18 | 2015-06-08 | High-sensitivity mirror type voltage stabilizing oscillation infrared detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN104596648A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105421982A (en) * | 2015-12-19 | 2016-03-23 | 成都克雷斯达科技有限公司 | Intelligent control system for roller shutter door based on signal processing type selection circuit |
-
2014
- 2014-11-18 CN CN201410658936.3A patent/CN104596648A/en active Pending
-
2015
- 2015-06-08 CN CN201510310427.6A patent/CN104864967A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105421982A (en) * | 2015-12-19 | 2016-03-23 | 成都克雷斯达科技有限公司 | Intelligent control system for roller shutter door based on signal processing type selection circuit |
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| Publication number | Publication date |
|---|---|
| CN104864967A (en) | 2015-08-26 |
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Application publication date: 20150506 |