CN115311810B - Infrared ray fire source early warning detecting system - Google Patents
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- CN115311810B CN115311810B CN202210940117.2A CN202210940117A CN115311810B CN 115311810 B CN115311810 B CN 115311810B CN 202210940117 A CN202210940117 A CN 202210940117A CN 115311810 B CN115311810 B CN 115311810B
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
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- Fire-Detection Mechanisms (AREA)
Abstract
The present disclosure provides an infrared fire source early warning detection system, comprising: the detection end of the infrared sensing unit detects infrared rays radiated by the fire source; the modulating end of the modulating unit is arranged between the detecting end of the infrared sensing unit and the fire source; the input end of the phase-sensitive detection unit is electrically connected with the output end of the infrared sensing unit and the output end of the modulation unit; and the output end of the phase-sensitive detection unit is electrically connected with the input end of the display unit. In the infrared fire source early warning detection system disclosed by the disclosure, fire disaster early warning is carried out by detecting the infrared rays radiated by the fire source, so that operators can judge the occurrence of the fire disaster in time, the fire disaster is eliminated in sprouting, larger life and property loss is avoided, and the production safety is effectively improved.
Description
Technical Field
The disclosure relates to the technical field of fire source early warning, in particular to an infrared fire source early warning detection system.
Background
Fire is a major hidden trouble in production, and timely finding and processing is an important means for avoiding fire spreading, but most of the current fire detection devices are in a larger state when detecting the fire, so that the larger fire is difficult to timely destroy, and particularly in the fields of coal and the like, larger life and property losses are extremely easy to cause.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
For this reason, the purpose of this disclosure is to provide an infrared ray fire source early warning detecting system.
To achieve the above object, the present disclosure provides an infrared fire source early warning detection system, including: the detection end of the infrared sensing unit detects infrared rays radiated by the fire source; the modulating end of the modulating unit is arranged between the detecting end of the infrared sensing unit and the fire source; the input end of the phase-sensitive detection unit is electrically connected with the output end of the infrared sensing unit and the output end of the modulation unit; the output end of the phase-sensitive detection unit is electrically connected with the input end of the display unit, and the phase-sensitive detection unit outputs a signal to the display unit according to the comparison result of the output signal of the infrared sensing unit and the output signal of the modulation unit so that the display unit displays the temperature of the fire source.
Optionally, the infrared sensing unit includes: a thermistor that detects infrared rays radiated from the fire source; the first end of the compensation resistor is connected with the first end of the thermistor; the positive electrode of the first power supply is connected with the second end of the thermistor, and the negative electrode of the first power supply is grounded; and the anode of the second power supply is connected with the cathode of the first power supply, and the cathode of the second power supply is connected with the second end of the compensation resistor.
Optionally, the early warning detection system further includes: an optical unit, the optical unit comprising: the convex lens is arranged between the fire source and the thermistor, the focus of the convex lens is positioned on the thermistor, the flat mirror is arranged between the convex lens and the fire source, and the flat mirror is made of zinc sulfide materials.
Optionally, the early warning detection system further includes: the input end of the first amplifying unit is electrically connected with the output end of the infrared sensing unit; the input end of the second amplifying unit is electrically connected with the output end of the first amplifying unit, and the output end of the second amplifying unit is connected with the input end of the phase-sensitive detection unit.
Optionally, the first amplifying unit includes: the negative electrode of the third power supply is grounded; a tenth resistor, wherein the second end of the tenth resistor is connected with the positive electrode of the third power supply; a fifth capacitor, wherein a first end of the fifth capacitor is connected with a first end of the tenth resistor, and a second end of the fifth capacitor is grounded; the first end of the first capacitor is connected with the output end of the infrared sensing unit; the first end of the first resistor is connected with the first end of the tenth resistor; the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with the negative electrode of the third power supply; the first end of the third resistor is connected with the second end of the first capacitor, and the second end of the third resistor is connected with the first end of the second resistor; the base electrode of the first triode is connected with the first end of the third resistor, and the collector electrode of the first triode is connected with the first end of the tenth resistor; the first end of the fourth resistor is connected with the emitter of the first triode, and the second end of the fourth resistor is connected with the negative electrode of the third power supply; the first end of the second capacitor is connected with the first end of the second resistor, and the second end of the second capacitor is connected with the emitter of the first triode; the first end of the third capacitor is connected with the second end of the second capacitor; a first end of the sixth resistor is connected with the second end of the third capacitor, and the second end of the sixth resistor is connected with the negative electrode of the third power supply; a fifth resistor, wherein a first end of the fifth resistor is connected with a first end of the tenth resistor, and a second end of the fifth resistor is connected with a second end of the third capacitor; a seventh resistor, wherein a first end of the seventh resistor is connected with a first end of the tenth resistor; the base electrode of the second triode is connected with the second end of the fifth resistor, and the collector electrode of the second triode is connected with the second end of the seventh resistor; the first end of the eighth resistor is connected with the emitter of the second triode, and the second end of the eighth resistor is connected with the negative electrode of the third power supply; the first end of the fourth capacitor is connected with the emitter of the second triode, and the second end of the fourth capacitor is connected with the negative electrode of the third power supply; the base electrode of the third triode is connected with the second end of the seventh resistor, and the collector electrode of the third triode is connected with the first end of the tenth resistor; and the first end of the ninth resistor is connected with the emitter of the third triode, and the second end of the ninth resistor is connected with the negative electrode of the third power supply.
Optionally, the second amplifying unit includes: an eleventh resistor, a first end of the eleventh resistor being connected to the first end of the tenth resistor; the first end of the attenuator is connected with the emitter of the third triode, and the third end of the attenuator is connected with the second end of the eleventh resistor; a twelfth resistor, a first end of which is connected with the fourth end of the attenuator, and a second end of which is connected with the negative electrode of the third power supply; a twenty-first resistor, a first end of which is connected with a second end of the tenth resistor, and a second end of which is connected with an anode of the third power supply; an eleventh capacitor, a first end of the eleventh capacitor is connected with a first end of the twenty-first resistor, and a second end of the eleventh capacitor is grounded; a thirteenth resistor, a first end of the thirteenth resistor being connected to a first end of the twenty-first resistor; the base electrode of the fourth triode is connected with the second end of the attenuator, and the collector electrode of the fourth triode is connected with the second end of the thirteenth resistor; a fourteenth resistor, wherein a first end of the fourteenth resistor is connected with the emitter of the fourth triode, and a second end of the fourteenth resistor is connected with the negative electrode of the third power supply; a first end of the sixth capacitor is connected with the emitter of the fourth triode, and a second end of the sixth capacitor is connected with the negative electrode of the third power supply; a seventh capacitor, wherein a first end of the seventh capacitor is connected with a second end of the thirteenth resistor; a seventeenth resistor, a first end of the seventeenth resistor being connected to a first end of the twenty-first resistor; the base electrode of the fifth triode is connected with the second end of the seventh capacitor, and the collector electrode of the fifth triode is connected with the second end of the seventeenth resistor; an eighteenth resistor, wherein a first end of the eighteenth resistor is connected with the emitter of the fifth triode, and a second end of the eighteenth resistor is connected with the negative electrode of the third power supply; a fifteenth resistor, wherein a first end of the fifteenth resistor is connected with a second end of the seventh capacitor; a sixteenth resistor, a first end of the sixteenth resistor being connected to a second end of the fifteenth resistor; an eighth capacitor, wherein a first end of the eighth capacitor is connected with a first end of the sixteenth resistor, and a second end of the eighth capacitor is connected with a negative electrode of the third power supply; a ninth capacitor, a first end of which is connected with a second end of the sixteenth resistor; a nineteenth resistor, a first terminal of the nineteenth resistor being connected to a first terminal of the twenty-first resistor; the base electrode of the sixth triode is connected with the second end of the ninth capacitor, and the collector electrode of the sixth triode is connected with the second end of the nineteenth resistor; a twentieth resistor, wherein a first end of the twentieth resistor is connected with the emitter of the sixth triode, and a second end of the twentieth resistor is connected with the negative electrode of the third power supply; a twenty-second resistor, a first end of the twenty-second resistor being connected to a first end of the twenty-first resistor; a twenty-third resistor, wherein a first end of the twenty-third resistor is connected with a second end of the twenty-second resistor, and a second end of the twenty-third resistor is connected with a negative electrode of the third power supply; a twenty-fourth resistor, wherein a first end of the twenty-fourth resistor is connected with a second end of the ninth capacitor; the first end of the potentiometer is connected with the second end of the twenty-fourth resistor, and the second end of the potentiometer is connected with the third end of the potentiometer; and the first end of the tenth capacitor is connected with the second end of the nineteenth resistor, and the second end of the tenth capacitor is connected with the third end of the potentiometer and the input end of the phase sensitive detection unit.
Optionally, the modulation unit includes: the modulating disc is positioned between the fire source and the flat mirror, and is rotatably arranged relative to the flat mirror, and a light through hole is formed in the modulating disc; the magnetic steel is arranged on the modulation disc; the driving end of the driving unit is magnetically connected with the magnetic steel, and the driving unit drives the magnetic steel to rotate so that the light through hole rotates relative to the flat mirror.
Optionally, the driving unit includes: the first inductor is magnetically connected with the magnetic steel; a thirteenth capacitor, a first end of the thirteenth capacitor is connected with a first end of the first inductor; the second inductor is magnetically connected with the magnetic steel, and the second end of the second inductor is connected with the second end of the first inductor; a twelfth capacitor, a first end of which is connected to the first end of the second inductor, and a second end of which is connected to the second end of the thirteenth capacitor; a twenty-fifth resistor, a first end of the twenty-fifth resistor being connected to the first end of the twelfth capacitor, a second end of the twenty-fifth resistor being connected to the second end of the twelfth capacitor; the positive electrode of the fourth power supply is connected with the second end of the second inductor; a seventh triode, wherein the seventh triode is an NPN type, the base electrode of the seventh triode is connected with the second end of the thirteenth capacitor, the collector electrode of the seventh triode is connected with the first end of the thirteenth capacitor, and the emitter electrode of the seventh triode is connected with the negative electrode of the fourth power supply; a twenty-sixth resistor, wherein a first end of the twenty-sixth resistor is connected with the collector electrode of the seventh triode; a twenty-seventh resistor, a first end of the twenty-seventh resistor being connected to a second end of the twenty-sixth resistor; a fourteenth capacitor, a first end of the fourteenth capacitor is connected with the first end of the twenty-sixth resistor, and a second end of the fourteenth capacitor is connected with the second end of the twenty-sixth resistor; the base electrode of the eighth triode is connected with the second end of the twenty-seventh resistor; a twenty-eighth resistor, wherein the second end of the twenty-eighth resistor is connected with the collector electrode of the eighth triode; a twenty-ninth resistor, wherein a first end of the twenty-ninth resistor is connected with the emitter of the eighth triode; the positive electrode of the fifth power supply is connected with the first end of the twenty-eighth resistor, the negative electrode of the fifth power supply is connected with the second end of the twenty-ninth resistor, and the negative electrode of the fifth power supply is grounded; the anode of the first diode is connected with the second end of the twenty-ninth resistor, and the cathode of the first diode is connected with the base electrode of the eighth triode; a thirty-first resistor, a first end of the thirty-first resistor being connected to a first end of the twenty-eighth resistor; a thirty-second resistor, a first end of the thirty-second resistor being connected to a first end of the thirty-second resistor; a second diode, the anode of which is connected with the second end of the thirty-second resistor; a thirty-third resistor, a first end of the thirty-third resistor being connected to the cathode of the second diode, a second end of the thirty-third resistor being connected to the second end of the twenty-ninth resistor; a ninth triode, wherein the base electrode of the ninth triode is connected with the second end of the thirty-second resistor, the collector electrode of the ninth triode is connected with the second end of the thirty-second resistor, and the emitter electrode of the ninth triode is connected with the second end of the twenty-ninth resistor; a fifteenth capacitor, wherein a first end of the fifteenth capacitor is connected with a second end of the twenty-eighth resistor, and a second end of the fifteenth capacitor is connected with a cathode of the second diode; a thirty-first resistor, a first end of the thirty-first resistor being connected to a second end of the thirty-first resistor; a thirty-fifth resistor, a first end of the thirty-fifth resistor being connected to a second end of the thirty-first resistor, a second end of the thirty-fifth resistor being connected to a second end of the thirty-third resistor; a thirty-fourth resistor, a first end of the thirty-fourth resistor being connected to a first end of the thirty-second resistor; a sixteenth capacitor, a first end of the sixteenth capacitor is connected with a second end of the thirty-fourth resistor, and a second end of the sixteenth capacitor is connected with a second end of the thirty-fourth resistor; and the thirteenth electrode tube is an NPN type, the base electrode of the thirteenth electrode tube is connected with the second end of the thirty-first resistor, the collector electrode of the thirteenth electrode tube is connected with the second end of the thirty-fourth resistor, and the emitter electrode of the thirteenth electrode tube is connected with the second end of the thirty-fifth resistor.
Optionally, the phase sensitive detection unit further includes: a seventeenth capacitor, a first end of the seventeenth capacitor being connected to a second end of the thirty-first resistor; a thirty-eighth resistor, wherein a second end of the thirty-eighth resistor is connected with a second end of the seventeenth capacitor; a nineteenth capacitor, wherein a first end of the nineteenth capacitor is connected with a second end of the tenth capacitor; a thirty-sixth resistor, a second terminal of the thirty-sixth resistor being connected to a second terminal of the nineteenth capacitor; an eleventh triode, wherein the eleventh triode is PNP, the base electrode of the eleventh triode is connected with the first end of the thirty-eighth resistor, the collector electrode of the eleventh triode is connected with the negative electrode of the fifth power supply, and the emitter electrode of the eleventh triode is connected with the first end of the thirty-sixth resistor; a thirty-ninth resistor, a second terminal of the thirty-ninth resistor being connected to a second terminal of the seventeenth capacitor; a thirty-seventh resistor, a first end of the thirty-seventh resistor being connected to a second end of the thirty-sixth resistor; a twelfth triode, wherein the twelfth triode is an NPN type, the base electrode of the twelfth triode is connected with the first end of the thirty-ninth resistor, the collector electrode of the twelfth triode is connected with the negative electrode of the fifth power supply, and the emitter electrode of the twelfth triode is connected with the second end of the thirty-seventh resistor; and the first end of the eighteenth capacitor is connected with the first end of the thirty-sixth resistor and the first end of the display unit, and the second end of the eighteenth capacitor is connected with the second end of the thirty-seventh resistor and the second end of the display unit.
Optionally, the early warning detection system further includes: the positive electrode of the alarm unit is connected with the positive electrode of the fifth power supply, the negative electrode of the alarm unit is connected with the negative electrode of the fifth power supply, and the signal input end of the alarm unit is connected with the second end of the tenth capacitor.
The technical scheme provided by the disclosure can comprise the following beneficial effects:
the fire disaster early warning mode is carried out by detecting the infrared rays radiated by the fire source, so that operators can judge the occurrence of the fire disaster in time, the fire disaster is eliminated in the sprouting process, the larger life and property loss is avoided, and the production safety is effectively improved.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic circuit diagram of an infrared fire source early warning detection system according to an embodiment of the disclosure;
FIG. 2 is a schematic circuit diagram of an infrared fire source early warning detection system according to an embodiment of the disclosure;
FIG. 3 is a schematic view of an optical unit in an infrared fire source early warning detection system according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a modulating unit in an infrared fire source early warning detection system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a modulation disc in an infrared fire source early warning detection system according to an embodiment of the present disclosure;
as shown in the figure: 1. the infrared sensing unit, 2, the modulating unit, 3, the phase sensitive detecting unit, 4, the display unit, 5, the convex lens, 6, the flat mirror, 7, the modulating disc, 8, the magnetic steel, 9, the light hole;
ra, thermistor, rb, compensation resistor, rc, potentiometer, R1, first resistor, R2, second resistor, R3, third resistor, R4, fourth resistor, R5, fifth resistor, R6, sixth resistor, R7, seventh resistor, R8, eighth resistor, R9, ninth resistor; r10, tenth resistor, R11, eleventh resistor, R12, twelfth resistor, R13, thirteenth resistor, R14, fourteenth resistor, R15, fifteenth resistor, R16, sixteenth resistor, R17, seventeenth resistor, R18, eighteenth resistor, R19, nineteenth resistor, R20, twentieth resistor, R21, twenty first resistor, R22, twenty second resistor, R23, twenty third resistor, R24, twenty fourth resistor, R25, twenty fifth resistor, R26, twenty sixth resistor, R27, twenty seventh resistor, R28, twenty eighth resistor, R29, twenty ninth resistor, R30, thirty third resistor, R31, thirty first resistor, R32, thirty second resistor, R33, thirty third resistor, R34, thirty fourth resistor, R35, thirty fifth resistor, R36, thirty sixth resistor, R37, thirty seventh resistor, R38, eight resistor, R39, thirty ninth resistor;
C1, first capacitance, C2, second capacitance, C3, third capacitance, C4, fourth capacitance, C5, fifth capacitance, C6, sixth capacitance, C7, seventh capacitance, C8, eighth capacitance, C9, ninth capacitance, C10, tenth capacitance, C11, eleventh capacitance, C12, twelfth capacitance, C13, thirteenth capacitance, C14, fourteenth capacitance, C15, fifteenth capacitance, C16, sixteenth capacitance, C17, seventeenth capacitance, C18, eighteenth capacitance, C19, nineteenth capacitance;
q1, a first triode, Q2, a second triode, Q3, a third triode, Q4, a fourth triode, Q5, a fifth triode, Q6, a sixth triode, Q7, a seventh triode, Q8, an eighth triode, Q9, a ninth triode, Q10, a thirteenth triode, Q11, an eleventh triode, Q12 and a twelfth triode;
u1, a first power supply, U2, a second power supply, U3, a third power supply, U4, a fourth power supply, U5 and a fifth power supply;
d1, a first diode, D2, a second diode;
A. an attenuator;
TI, microampere table.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
As shown in fig. 1, the embodiment of the disclosure provides an infrared fire source early warning detection system, which comprises an infrared sensing unit 1, a modulation unit 2, a phase-sensitive detection unit 3 and a display unit 4, wherein the detection end of the infrared sensing unit 1 detects infrared rays radiated by a fire source, the modulation end of the modulation unit 2 is arranged between the detection end of the infrared sensing unit 1 and the fire source, the input end of the phase-sensitive detection unit 3 is electrically connected with the output end of the infrared sensing unit 1 and the output end of the modulation unit 2, the output end of the phase-sensitive detection unit is electrically connected with the input end of the display unit 4, and the phase-sensitive detection unit 3 outputs signals to the display unit 4 according to the comparison result of the output signals of the infrared sensing unit 1 and the output signals of the modulation unit 2, so that the display unit 4 displays the temperature of the fire source.
It can be understood that the infrared rays radiated by the fire source are modulated by the modulating unit 2, then detected by the infrared sensing unit 1 and converted into temperature electric signals, and sent to the phase-sensitive detecting unit 3, meanwhile, the modulating unit 2 provides a reference temperature threshold for the phase-sensitive detecting unit 3, and the phase-sensitive detecting unit 3 compares the temperature electric signals output by the infrared sensing unit 1 with the temperature threshold electric signals output by the modulating unit 2 according to the temperature electric signals output by the infrared sensing unit 1, so that the display unit 4 displays the temperature of the fire source.
The fire disaster early warning mode by detecting the infrared rays radiated by the fire source enables operators to judge the occurrence of the fire disaster in time, so that the fire disaster is eliminated in the sprouting, the larger life and property loss is avoided, and the production safety is effectively improved.
The fire source is an object that is easy to burn, for example: coal briquettes, wood briquettes, etc.
The reference temperature threshold value provided by the modulation unit 2 for the phase sensitive detection unit 3 may be set according to actual needs, and is not limited herein.
When the early warning detection system is applied to the field of coal, the oxidation conditions of the coal are different, and the infrared rays radiated by the early warning detection system are different, so that the oxidation conditions of the coal can be obtained by detecting the infrared rays radiated by the coal, and then early warning is carried out before the coal is burnt, so that operators can timely kill fire disasters in sprouting.
As shown in fig. 2, in some embodiments, the infrared sensing unit 1 includes a thermistor Ra, a compensation resistor Rb, a first power supply U1 and a second power supply U2, the thermistor Ra detects infrared rays radiated by a fire source, a first end of the compensation resistor Rb is connected to a first end of the thermistor Ra, an anode of the first power supply U1 is connected to a second end of the thermistor Ra, a cathode of the first power supply U1 is grounded, an anode of the second power supply U2 is connected to a cathode of the first power supply U1, and a cathode of the second power supply U2 is connected to a second end of the compensation resistor Rb.
It will be appreciated that the thermistor Ra is used for receiving infrared radiation of fire source, the compensation resistor Rb is used for temperature compensation, the first power supply U1 and the second power supply U2 are used for providing bias voltage, when infrared radiation of fire source is not received, the thermistor Ra, the compensation resistor Rb, the first power supply U1 and the second power supply U2 form a stable bridge structure, when infrared radiation of fire source is received, the resistance value of the thermistor Ra is reduced along with the rising of temperature, so that the bridge is unbalanced, and then an electric signal is output, so as to realize temperature detection.
It should be noted that, the thermistor Ra may be a semiconductor sheet made of oxides of manganese, cobalt and nickel, and the semiconductor sheet has a temperature coefficient of-4%, can detect radiant energy of milliwatt level, works at room temperature without refrigeration, and effectively ensures high sensitivity of the early warning detection system.
The compensation resistor Rb can be shielded by a shielding net, a shielding case, etc., so that the compensation resistor Rb is only used for temperature compensation, and the stable detection of the infrared sensor unit 1 on the infrared rays is ensured.
The range of resistance change of the thermistor Ra can be set according to actual needs, and is not limited herein.
The resistance value of the compensation resistor Rb may be set according to actual needs, and is not limited herein.
The output voltage values of the first power supply U1 and the second power supply U2 may be set according to actual needs, for example: the output voltage values of the first power supply U1 and the second power supply U2 are 15V.
As shown in fig. 3, in some embodiments, the early warning detection system further includes an optical unit including a convex lens 5 and a flat mirror 6, the convex lens 5 is disposed between the fire source and a thermistor Ra, a focal point of the convex lens 5 is located on the thermistor Ra, the flat mirror 6 is disposed between the convex lens 5 and the fire source, and the flat mirror 6 is made of zinc sulfide material.
It can be understood that the infrared rays radiated by the fire source sequentially pass through the flat mirror 6 and the convex lens 5 and then reach the thermistor Ra, wherein the infrared rays radiated by the fire source can be focused on the thermistor Ra through the arrangement of the convex lens 5, so that the receiving area of the thermistor Ra is greatly reduced, the noise of the thermistor Ra is reduced, and the detection capability of the infrared sensing unit 1 is improved; by providing the flat mirror 6 made of zinc sulfide material, the convex lens 5 and the thermistor Ra and other components are effectively protected, so that the stability of the infrared sensor unit 1 is higher.
It should be noted that a cylindrical structure may be provided, the flat mirror 6 is disposed at one end of the cylindrical structure, and the convex lens 5 and the infrared sensor unit 1 are disposed in the cylindrical structure, so as to ensure stable detection of the infrared sensor unit 1. The dimensions of the convex lens 5 and the flat lens 6 can be set according to practical needs, wherein the infrared rays transmitted by the flat lens 6 and the convex lens 5 should ensure that the radiation energy variation value received by the thermistor Ra is larger than the noise equivalent power of the thermistor itself.
The convex lens 5 may be a germanium lens, which is not transparent to visible light and ultraviolet light, but transparent to infrared light, and can make the thermistor Ra obtain a spectral response of 2-18 μm, so that stable detection of the infrared sensor unit 1 can be ensured, and the flat mirror 6 made of zinc sulfide material can prevent the germanium lens from being damaged by water vapor, dust, etc., and prevent the coating film of the germanium lens from falling off. Wherein, the transmittance of zinc sulfide is 70% in the spectral range of 1-13 μm, which can ensure the stable detection of the infrared sensor unit 1.
The optical unit may have a field of view of 1.5 degrees by 1.5 degrees, with a measurable target volume of 50 square centimeters 5 meters away from the fire source, with the most accurate measurement when the fire source is detected to fill the field of view of the optical unit.
In some embodiments, the early warning detection system further includes a first amplifying unit, an input end of the first amplifying unit is electrically connected to an output end of the infrared sensing unit 1, an input end of the second amplifying unit is electrically connected to an output end of the first amplifying unit, and an output end of the second amplifying unit is connected to an input end of the phase sensitive detecting unit 3.
It can be understood that the amplification of the output signal of the infrared sensing unit 1 is realized through the arrangement of the first amplifying unit and the second amplifying unit, so that the sensitivity of the early warning detection system is effectively improved.
As shown in fig. 2, in some embodiments, the first amplifying unit includes a third power supply U3, a tenth resistor R10, a fifth capacitor C5, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a first triode Q1, a fourth resistor R4, a second capacitor C2, a third capacitor C3, a sixth resistor R6, a fifth resistor R5, a seventh resistor R7, a second triode Q2, an eighth resistor R8, a fourth capacitor C4, a third triode Q3, and a ninth resistor R9, the negative electrode of the third power supply U3 is grounded, the second end of the tenth resistor R10 is connected to the positive electrode of the third power supply U3, the first end of the fifth capacitor C5 is connected to the first end of the tenth resistor R10, the second end of the fifth capacitor C5 is grounded, the first end of the first capacitor C1 is connected to the output end of the infrared sensing unit 1, the first end of the first resistor R1 is connected to the first end of the tenth resistor R10, the first end of the second resistor R2 is connected to the first end of the first resistor R1, the second end of the second resistor R2 is connected with the negative electrode of the third power supply U3, the first end of the third resistor R3 is connected with the second end of the first capacitor C1, the second end of the third resistor R3 is connected with the first end of the second resistor R2, the first triode Q1 is NPN type, the base electrode of the first triode Q1 is connected with the first end of the third resistor R3, the collector electrode of the first triode Q1 is connected with the first end of the tenth resistor R10, the first end of the fourth resistor R4 is connected with the emitter electrode of the first triode Q1, the second end of the fourth resistor R4 is connected with the negative electrode of the third power supply U3, the first end of the second capacitor C2 is connected with the first end of the second resistor R2, the second end of the second capacitor C2 is connected with the emitter electrode of the first triode Q1, the first end of the third capacitor C3 is connected with the second end of the second capacitor C2, the first end of the sixth resistor R6 is connected with the second end of the third capacitor C3, the second end of the sixth resistor R6 is connected with the negative electrode of the third power supply U3, the first end of the fifth resistor R5 is connected with the first end of the tenth resistor R10, the second end of the fifth resistor R5 is connected with the second end of the third capacitor C3, the first end of the seventh resistor R7 is connected with the first end of the tenth resistor R10, the second triode Q2 is NPN, the base electrode of the second triode Q2 is connected with the second end of the fifth resistor R5, the collector electrode of the second triode Q2 is connected with the second end of the seventh resistor R7, the first end of the eighth resistor R8 is connected with the emitter electrode of the second triode Q2, the second end of the eighth resistor R8 is connected with the negative electrode of the third power supply U3, the first end of the fourth capacitor C4 is connected with the emitter electrode of the second triode Q2, the second end of the fourth capacitor C4 is connected with the negative electrode of the third power supply U3, the third triode Q3 is NPN, the base electrode of the third triode Q3 is connected with the third resistor R7, the first end of the third triode Q3 is connected with the emitter electrode of the third resistor Q9 is connected with the third triode Q3, and the third triode Q9 is connected with the negative electrode of the third resistor Q9.
It can be understood that the third power supply U3 provides the working voltage for the first amplifying unit, and the output voltage of the third power supply U3 can meet the use of the first amplifying unit through the voltage division effect of the tenth resistor R10, and meanwhile, through the arrangement of the fifth capacitor C5, the harmful cross connection influence of the second amplifying unit on the first amplifying unit is effectively reduced, and the stable amplification of the first amplifying unit on the output signal of the infrared sensing unit 1 is ensured;
the bias voltage is provided for the first triode Q1 through the arrangement of the first resistor R1, the second resistor R2, the third resistor R3 and other components, so that the first triode Q1 amplifies the voltage signal output by the infrared sensing unit 1, and meanwhile, the input impedance of the first amplifying unit is further improved through the voltage feedback of the second capacitor C2, so that the high-output impedance of the infrared sensing unit 1 is adapted;
the bias voltage is provided for the second triode Q2 and the third triode Q3 through the arrangement of the parts such as the fifth resistor R5, the seventh resistor R7 and the eighth resistor R8, and the emitter of the third triode Q3 is used as the integral output through the direct coupling of the second triode Q2 and the third triode Q3, so that the integral output impedance is reduced while the output signal of the infrared sensing unit 1 is continuously amplified, the adaptation to the second amplifying unit is ensured, the integral has stronger anti-interference capability, and the stable amplification of the output signal of the infrared sensing unit 1 by the first amplifying unit is ensured.
It should be noted that, the output voltage value of the third power supply U3 may be set according to actual needs, for example: 15V, and the working voltage value of the first amplifying unit after the voltage division of the tenth resistor R10 may also be set according to actual needs, for example: 8.5V.
The NPN type first transistor Q1, the second transistor Q2, and the third transistor Q3 each include two N (Negative) type semiconductors and one P (Positive) type semiconductor, the P type semiconductor is disposed between the two N type semiconductors, and the first transistor Q1, the second transistor Q2, and the third transistor Q3 each include a Base (Base), an Emitter (Emitter), and a Collector (Collector), and are turned off between the Emitter and the Collector, and turned on between the Emitter and the Collector, when turned on.
The resistance values of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 may be set according to actual needs, and are not limited herein.
The capacitance values of the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 may be set according to actual needs, which is not limited herein.
As shown in fig. 2, in some embodiments, the second amplifying unit includes an eleventh resistor R11, an attenuator a, a twelfth resistor R12, a twenty-first resistor R21, an eleventh capacitor C11, a thirteenth resistor R13, a fourth transistor Q4, a fourteenth resistor R14, a sixth capacitor C6, a seventh capacitor C7, a seventeenth resistor R17, a fifth transistor Q5, an eighteenth resistor R18, a fifteenth resistor R15, a sixteenth resistor R16, an eighth capacitor C8, a ninth capacitor C9, a nineteenth resistor R19, a sixth transistor Q6, a twentieth resistor R20, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a potentiometer Rc, and a tenth capacitor C10, a first end of the eleventh resistor R11 being connected to a first end of the tenth resistor R10, a first end of the attenuator a being connected to an emitter of the third transistor Q3, a third end of the attenuator a being connected to a second end of the eleventh resistor R11, the first end of the twelfth resistor R12 is connected with the fourth end of the attenuator A, the second end of the twelfth resistor R12 is connected with the negative electrode of the third power supply U3, the first end of the twenty-first resistor R21 is connected with the second end of the tenth resistor R10, the second end of the twenty-first resistor R21 is connected with the positive electrode of the third power supply U3, the first end of the eleventh capacitor C11 is connected with the first end of the twenty-first resistor R21, the second end of the eleventh capacitor C11 is grounded, the first end of the thirteenth resistor R13 is connected with the first end of the twenty-first resistor R21, the fourth triode Q4 is NPN type, the base electrode of the fourth triode Q4 is connected with the second end of the attenuator A, the collector electrode of the fourth triode Q4 is connected with the second end of the thirteenth resistor R13, the first end of the fourteenth resistor R14 is connected with the emitter electrode of the fourth triode Q4, the second end of the fourteenth resistor R14 is connected with the negative electrode of the third power supply U3, the first end of the sixth capacitor C6 is connected with the emitter of the fourth triode Q4, the second end of the sixth capacitor C6 is connected with the cathode of the third power supply U3, the first end of the seventh capacitor C7 is connected with the second end of the thirteenth resistor R13, the first end of the seventeenth resistor R17 is connected with the first end of the twenty-first resistor R21, the fifth triode Q5 is NPN type, the base of the fifth triode Q5 is connected with the second end of the seventh capacitor C7, the collector of the fifth triode Q5 is connected with the second end of the seventeenth resistor R17, the first end of the eighteenth resistor R18 is connected with the cathode of the third power supply U3, the first end of the fifteenth resistor R15 is connected with the second end of the seventh capacitor C7, the first end of the sixteenth resistor R16 is connected with the second end of the fifteenth resistor R15, the first end of the eighth capacitor C8 is connected with the third end of the sixteenth resistor R16, the base of the sixteenth resistor R6 is connected with the twenty-third end of the twenty-third resistor R6, the twenty-third end of the nineteenth resistor R6 is connected with the twenty-third end of the twenty-third resistor R3, the twenty-fourth resistor R22 is connected with the cathode of the twenty-third resistor R6, the twenty-fourth resistor R9 is connected with the twenty-third end of the twenty-third resistor R6 is connected with the twenty-third end of the twenty-third resistor R3, the twenty-fourth resistor R20 is connected with the twenty-third end of the twenty-third resistor R18, the twenty-fourth resistor is connected with the twenty-third end of the twenty-third resistor R3, the twenty-third end is connected with the twenty-third resistor, the first end of the twenty-fourth resistor R24 is connected to the second end of the ninth resistor C9, the first end of the potentiometer Rc is connected to the second end of the twenty-fourth resistor R24, the second end of the potentiometer Rc is connected to the third end of the potentiometer Rc, the first end of the tenth capacitor C10 is connected to the second end of the nineteenth resistor R19, and the second end of the tenth capacitor C10 is connected to the third end of the potentiometer Rc and the input end of the phase sensitive detection unit 3.
It can be understood that the third power supply U3 provides the working voltage for the second amplifying unit, and the voltage division effect of the twenty-first resistor R21 makes the output voltage of the third power supply U3 meet the requirement of the second amplifying unit, and meanwhile, through the arrangement of the eleventh capacitor C11, the harmful cross connection between the first amplifying unit and the second amplifying unit is effectively reduced, so that the stable amplification of the output signal of the infrared sensing unit 1 by the second amplifying unit is ensured;
the attenuator A receives the output signal of the first amplifying unit and outputs the signal to the fourth triode Q4 of the second amplifying unit, so that impedance matching between the first amplifying unit and the second amplifying unit is improved, and stable amplification of the output signal of the infrared sensing unit 1 by the second amplifying unit is ensured;
by means of arrangement of components such as an eleventh resistor R11, a twelfth resistor R12 and a seventeenth resistor R17, bias voltages are provided for a fourth triode Q4 and a fifth triode Q5, so that the fourth triode Q4 and the fifth triode Q5 carry out secondary amplification on voltage signals output by an infrared sensing unit 1, high sensitivity of an early warning detection system is guaranteed, meanwhile, the seventeenth resistor R17 is connected with a collector electrode of the fourth triode Q4, and through arrangement of a sixteenth resistor R16 and an eighth capacitor C8, alternating voltage output by the seventeenth resistor R17 is short-circuited through the eighth capacitor C8, and further gain of a second amplifying unit is improved, and stability of a direct current working point is guaranteed;
Through the arrangement of the twenty-fourth resistor R24, the potentiometer Rc, the tenth capacitor C10 and other components, and by utilizing the characteristic that the collector and emitter outputs of the sixth triode Q6 are reversed, the output signal of the second amplifying unit can be phase-shifted within 180 degrees when the resistance value of the potentiometer Rc is regulated, so that the adaptation of the second amplifying unit to the phase-sensitive detection unit 3 is ensured;
it should be noted that, the working voltage value of the second amplifying unit after the voltage division of the twenty-first resistor R21 may be set according to actual needs, for example: 9V.
The fourth triode Q4, the fifth triode Q5 and the sixth triode Q6 of NPN type all comprise two N type semiconductors and one P type semiconductor, the P type semiconductor is arranged between the two N type semiconductors, the fourth triode Q4, the fifth triode Q5 and the sixth triode Q6 all comprise a base electrode, an emitter electrode and a collector electrode, in the off state, the emitter electrode and the collector electrode are disconnected, and in the on state, the emitter electrode and the collector electrode are conducted.
The resistance values of the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the twentieth resistor R20, the twenty first resistor R21, the twenty second resistor R22, the twenty third resistor R23, and the twenty fourth resistor R24 may be set according to actual needs, and are not limited herein.
The capacitance values of the sixth capacitance C6, the seventh capacitance C7, the eighth capacitance C8, the ninth capacitance C9, the tenth capacitance C10, and the eleventh capacitance C11 may be set according to actual needs, and are not limited herein.
The type of the attenuator a may be set according to actual needs, and is not limited herein.
The potentiometer Rc comprises a first end, a second end and a third end, the potentiometer Rc is generally composed of a resistor body and movable brushes, the first end and the second end of the potentiometer Rc are arranged at two ends of the resistor body, the third end of the potentiometer Rc is arranged on the brushes, and when the brushes move along the resistor body, the potentiometer Rc obtains a resistance value which is in a certain relation with the displacement of the brushes. The specific resistance value of the potentiometer Rc may be set according to actual needs, and is not limited herein.
It is possible to reduce the capacitance values of the fifth capacitor C5 and the eleventh capacitor C11 and to increase the resistance values of the tenth resistor R10 and the twenty-first resistor R21 to prevent the occurrence of the self-oscillation problem while satisfying the amplification actions of the first amplification unit and the second amplification unit.
As shown in fig. 3, 4 and 5, in some embodiments, the modulating unit 2 includes a modulating disc 7, a magnetic steel 8 and a driving unit, the modulating disc 7 is located between the fire source and the flat mirror 6, the modulating disc 7 is rotatably disposed relative to the flat mirror 6, a light-passing hole 9 is disposed on the modulating disc 7, the magnetic steel 8 is disposed on the modulating disc 7, a driving end of the driving unit is magnetically connected with the magnetic steel 8, and the driving unit drives the magnetic steel 8 to rotate so that the light-passing hole 9 rotates relative to the flat mirror 6.
It can be understood that the driving unit generates a variable magnetic field to enable the magnetic steel 8 to rotate, the magnetic steel 8 rotates to drive the modulation disc 7 to rotate, and the modulation disc 7 rotates to drive the light-passing hole 9 to rotate relative to the flat mirror 6, so that infrared rays of fire source radiation are converted into alternating radiation, and the alternating radiation is input into the phase-sensitive detection unit 3 after being amplified by the first amplifying unit and the second amplifying unit, and high-sensitivity detection is achieved.
It should be noted that a cover structure may be provided, the modulation disk 7 is fixed at one end of the cover structure, the other end of the cover structure is rotatably sleeved on the cylinder structure, and the magnetic steel 8 is fixed on the cover structure.
The mounting position and the magnetic pole orientation of the magnetic steel 8 can be set according to actual needs, and are not limited herein.
The size of the light-transmitting hole 9 can be set according to actual needs, for example: the light-passing holes 9 make the width of the blades formed on the reticle 7 equal to one quarter of the circumference of the reticle 7.
As shown in fig. 2, in some embodiments, the driving unit includes a first inductor, a thirteenth capacitor C13, a second inductor, a twelfth capacitor C12, a twenty-fifth resistor R25, a fourth power supply U4, a seventh triode Q7, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a fourteenth capacitor C14, an eighth triode Q8, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a fifth power supply U5, a first diode D1, a thirty-second resistor R30, a thirty-second resistor R32, a second diode D2, a thirty-third resistor R33, a ninth triode Q9, a fifteenth capacitor C15, a thirty-first resistor R31, a thirty-fifth resistor R35, a thirty-fourth resistor R34, a sixteenth capacitor C16, and a thirteenth diode Q10, the first inductor is magnetically connected to the magnetic steel 8, a first end of the thirteenth capacitor C13 is magnetically connected to a first end of the first inductor, the second inductor is magnetically connected to the magnetic steel 8, the second end of the second inductor is connected with the second end of the first inductor, the first end of the twelfth capacitor C12 is connected with the first end of the second inductor, the second end of the twelfth capacitor C12 is connected with the second end of the thirteenth capacitor C13, the first end of the twenty-fifth resistor R25 is connected with the first end of the twelfth capacitor C12, the second end of the twenty-fifth resistor R25 is connected with the second end of the twelfth capacitor C12, the positive electrode of the fourth power supply U4 is connected with the second end of the second inductor, the seventh triode Q7 is NPN type, the base electrode of the seventh triode Q7 is connected with the second end of the thirteenth capacitor C13, the collector electrode of the seventh triode Q7 is connected with the first end of the thirteenth capacitor C13, the emitter electrode of the seventh triode Q7 is connected with the negative electrode of the fourth power supply U4, the first end of the twenty-sixth resistor R26 is connected with the collector electrode of the seventh triode Q7, the first end of the twenty-seventh resistor R27 is connected with the second end of the twenty-sixth resistor R26, the first end of the fourteenth capacitor C14 is connected with the first end of a twenty-sixth resistor R26, the second end of the fourteenth capacitor C14 is connected with the second end of a twenty-sixth resistor R26, the eighth triode Q8 is of NPN type, the base of the eighth triode Q8 is connected with the second end of a twenty-seventh resistor R27, the second end of a twenty-eighth resistor R28 is connected with the collector of the eighth triode Q8, the first end of a twenty-ninth resistor R29 is connected with the emitter of the eighth triode Q8, the positive electrode of a fifth power supply U5 is connected with the second end of a twenty-eighth resistor R28, the negative electrode of the fifth power supply U5 is grounded, the anode of a first diode D1 is connected with the second end of the twenty-ninth resistor R29, the first end of a thirty-eighth resistor R30 is connected with the first end of the eighth resistor R28, the second end of a thirty-second resistor R32 is connected with the third end of a thirty-eighth resistor R9, the third end of a thirty-eighth resistor R30 is connected with the third end of a thirty-eighth resistor R9, the base of a thirty-eighth resistor R9 is connected with the thirty-eighth resistor R9, the thirty-eighth resistor R9 is connected with the third end of a thirty-eighth resistor R30, the thirty-eighth resistor R9 is connected with the thirty-eighth resistor R9, the third end of the thirty-eighth resistor R9 is connected with the thirty-eighth resistor R9, the thirty-eighth resistor is connected with the cathode of the third resistor R2 is connected with the cathode of the third resistor is 1, the third electrode is connected with the third electrode is, the first end of the thirty-fifth resistor R35 is connected with the second end of the thirty-first resistor R31, the second end of the thirty-fifth resistor R35 is connected with the second end of the thirty-third resistor R33, the first end of the thirty-fourth resistor R34 is connected with the first end of the thirty-second resistor R32, the first end of the sixteenth capacitor C16 is connected with the second end of the thirty-second resistor R32, the second end of the sixteenth capacitor C16 is connected with the second end of the thirty-fourth resistor R34, the thirteenth pole tube Q10 is NPN, the base electrode of the thirteenth pole tube Q10 is connected with the second end of the thirty-first resistor R31, the collector electrode of the thirteenth pole tube Q10 is connected with the second end of the thirty-fourth resistor R34, and the emitter electrode of the thirteenth pole tube Q10 is connected with the second end of the thirty-fifth resistor R35.
It can be understood that the fourth power supply U4 provides an operating voltage for the first inductor, the thirteenth capacitor C13, the twelfth capacitor C12, etc. to ensure stable driving of the modulation unit 2, and the fifth power supply U5 provides an operating voltage for the eighth triode Q8, the ninth triode Q9, etc. to provide a reference temperature threshold for the phase sensitive detection unit 3;
through the arrangement of the thirteenth capacitor C13, the twelfth capacitor C12 and other components, a variable magnetic field is generated on the first inductor, so that the magnetic steel 8 is driven to rotate by the variable magnetic field, and further the rotation of the modulation disc 7 is realized;
meanwhile, the second inductor senses the rotation of the magnetic steel 8 and outputs a pulse signal to the seventh triode Q7, the seventh triode Q7 is enabled to transmit the pulse signal to the eighth triode Q8 through the arrangement of the twenty-sixth resistor R26, the fourteenth capacitor C14 and other components, the eighth triode Q8 is enabled to form a phase inverter circuit through the arrangement of the twenty-seventh resistor R27, the twenty-eighth resistor R28 and other components, the pulse signal is shaped, the shaping signal is enabled to transmit to the ninth triode Q9 and the thirteenth triode Q10 through the differentiation of the fifteenth capacitor C15 and the thirty-third resistor R33, the thirty-first resistor R31, the thirty-second resistor R32 and other components are arranged, the ninth triode Q9 and the tenth triode Q10 form a timing monostable trigger, and the timing monostable trigger outputs a square wave with the same frequency and the same phase as the second amplifying circuit to the phase-sensitive circuit, and therefore the reference temperature threshold is provided for the phase-sensitive detection circuit.
It should be noted that, the output voltage value of the fourth power supply U4 may be set according to actual needs, for example: 3V.
The output voltage value of the fifth power supply U5 may be set according to actual needs, for example: 3V. The working voltage values of the inverter circuit and the timing monostable trigger can be set according to actual needs, for example: 9V.
The seventh triode Q7, the eighth triode Q8, the ninth triode Q9 and the tenth triode Q10 of NPN type comprise two N type semiconductors and one P type semiconductor, the P type semiconductors are arranged between the two N type semiconductors, the seventh triode Q7, the eighth triode Q8, the ninth triode Q9 and the tenth triode Q10 comprise a base electrode, an emitter electrode and a collector electrode, the emitter electrode and the collector electrode are disconnected in the cut-off state, and the emitter electrode and the collector electrode are connected in the conduction state.
The inductance values of the first inductor and the second inductor may be set according to actual needs, and are not limited herein.
The resistance values of the twenty-fifth resistor R25, the twenty-sixth resistor R26, the twenty-seventh resistor R27, the twenty-eighth resistor R28, the twenty-ninth resistor R29, the thirty-third resistor R30, the thirty-first resistor R31, the thirty-second resistor R32, the thirty-third resistor R33, the thirty-fourth resistor R34, and the thirty-fifth resistor R35 may be set according to actual needs, and are not limited herein.
The capacitance values of the twelfth capacitance C12, the thirteenth capacitance C13, the fourteenth capacitance C14, the fifteenth capacitance C15 and the sixteenth capacitance C16 may be set according to actual needs, and are not limited herein.
The types of the first diode D1 and the second diode D2 may be set according to actual needs, and are not limited herein.
As shown in fig. 2, in some embodiments, the phase sensitive detection unit 3 further includes a seventeenth capacitor C17, a thirty-eighth resistor R38, a nineteenth capacitor C19, a thirty-sixth resistor R36, an eleventh transistor Q11, a thirty-ninth resistor R39, a thirty-seventh resistor R37, a twelfth transistor Q12, and an eighteenth capacitor C18, wherein a first end of the seventeenth capacitor C17 is connected to a second end of the thirty-third resistor R30, a second end of the thirty-eighth resistor R38 is connected to a second end of the seventeenth capacitor C17, a first end of the nineteenth capacitor C19 is connected to a second end of the tenth capacitor C10, a second end of the thirty-sixth resistor R36 is connected to a second end of the nineteenth capacitor C19, the eleventh transistor Q11 is a PNP, a base of the eleventh transistor Q11 is connected to a first end of the thirty-eighth resistor R38, a collector of the eleventh transistor Q11 is connected to a negative electrode of the fifth power supply U5, an emitter of the eleventh transistor Q11 is connected to a third end of the thirty-sixth resistor R36, a second end of the thirty-eighth resistor R36 is connected to a third end of the thirty-eighth resistor R12, a third end of the thirty-eighth resistor R37 is connected to a thirty-eighth resistor R12, a third end of the thirty-eighth transistor Q37 is connected to a thirty-eighth resistor R12, a thirty-eighth resistor of the thirty-fourth resistor Q12 is connected to a thirty-eighth resistor Q12, a base of the thirty-eighth transistor Q11 is connected to a thirty-eighth resistor Q12, a base of the eighth resistor is connected to a third resistor 12, a third is connected to a third end of the eighth resistor 12, and a third resistor is connected to a third resistor.
It can be understood that the fifth power supply U5 provides the working voltage for the eleventh triode Q11, the twelfth triode Q12, and the like, so that the phase sensitive detection unit 3 can compare the temperature electric signal output by the infrared sensing unit 1 with the temperature threshold electric signal output by the modulation unit 2, so that the display unit 4 displays the temperature of the fire source;
the eleventh triode Q11 and the twelfth triode Q12 are alternately conducted through the arrangement of the thirty-eighth resistor R38, the thirty-ninth resistor R39, the thirty-sixth resistor R36 and other components and the signal output of the second amplifying unit and the timing monostable trigger, so that the current of the display unit 4 is conducted along a fixed direction, and the display unit 4 displays the temperature of a fire source after comparing the temperature electric signal output by the infrared sensing unit 1 with the temperature threshold electric signal output by the modulating unit 2.
It should be noted that, the display unit 4 may be a microammeter TI with a pointer, when the temperature output by the infrared sensing unit 1 is less than the temperature threshold output by the modulation unit 2, the pointer of the microammeter TI is biased negative, and when the temperature output by the infrared sensing unit 1 is greater than or equal to the temperature threshold output by the modulation unit 2, the pointer of the microammeter TI is biased positive and displays the temperature output by the infrared sensing unit 1.
The microampere table TI can be made to detect the output signal of the phase sensitive detection unit 315mV by appropriately adjusting the output phase of the second amplification unit.
The twelfth triode Q12 of NPN type comprises two N type semiconductors and one P type semiconductor, the P type semiconductor is arranged between the two N type semiconductors, the twelfth triode Q12 comprises a base electrode, an emitter electrode and a collector electrode, the emitter electrode and the collector electrode are disconnected in the off state, and the emitter electrode and the collector electrode are conducted in the on state.
The eleventh triode Q11 of PNP type includes a piece of N type semiconductor and two pieces of P type semiconductor, N type semiconductor sets up between two pieces of P type semiconductor, and eleventh triode Q11 includes base, projecting pole and collector, and in the off-state, break off between projecting pole and the collector, in the on-state, break on between projecting pole and the collector.
The resistance values of the thirty-sixth resistor R36, the thirty-seventh resistor R37, the thirty-eighth resistor R38, and the thirty-ninth resistor R39 may be set according to actual needs, and are not limited herein.
The capacitance values of the seventeenth capacitance C17, the eighteenth capacitance C18, and the nineteenth capacitance C19 may be set according to actual needs, and are not limited herein.
As shown in fig. 2, in some embodiments, the early warning detection system further includes an alarm unit, the positive electrode of the alarm unit is connected to the positive electrode of the fifth power supply U5, the negative electrode of the alarm unit is connected to the negative electrode of the fifth power supply U5, and the signal input end of the alarm unit is connected to the second end of the tenth capacitor C10.
It can be understood that the fifth power supply U5 supplies power to the alarm unit, so that the alarm unit can stably alarm; when the display unit 4 displays the temperature of the fire source, the second amplifying unit transmits signals to the alarm unit so that the alarm unit alarms, thereby better reminding operators to process in time and avoiding the occurrence of larger fire.
The alarm unit can be an audible alarm, a light alarm or an audible and visual alarm.
In the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.
Claims (8)
1. An infrared fire source early warning detection system, comprising:
the detection end of the infrared sensing unit detects infrared rays radiated by the fire source;
the modulating end of the modulating unit is arranged between the detecting end of the infrared sensing unit and the fire source;
The input end of the phase-sensitive detection unit is electrically connected with the output end of the infrared sensing unit and the output end of the modulation unit;
the output end of the phase-sensitive detection unit is electrically connected with the input end of the display unit, and the phase-sensitive detection unit outputs a signal to the display unit according to the comparison result of the output signal of the infrared sensing unit and the output signal of the modulation unit so as to enable the display unit to display the temperature of the fire source;
the input end of the first amplifying unit is electrically connected with the output end of the infrared sensing unit;
the input end of the second amplifying unit is electrically connected with the output end of the first amplifying unit, and the output end of the second amplifying unit is connected with the input end of the phase-sensitive detection unit;
wherein the first amplifying unit includes:
the negative electrode of the third power supply is grounded;
a tenth resistor, wherein the second end of the tenth resistor is connected with the positive electrode of the third power supply;
a fifth capacitor, wherein a first end of the fifth capacitor is connected with a first end of the tenth resistor, and a second end of the fifth capacitor is grounded;
The first end of the first capacitor is connected with the output end of the infrared sensing unit;
the first end of the first resistor is connected with the first end of the tenth resistor;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with the negative electrode of the third power supply;
the first end of the third resistor is connected with the second end of the first capacitor, and the second end of the third resistor is connected with the first end of the second resistor;
the base electrode of the first triode is connected with the first end of the third resistor, and the collector electrode of the first triode is connected with the first end of the tenth resistor;
the first end of the fourth resistor is connected with the emitter of the first triode, and the second end of the fourth resistor is connected with the negative electrode of the third power supply;
the first end of the second capacitor is connected with the first end of the second resistor, and the second end of the second capacitor is connected with the emitter of the first triode;
the first end of the third capacitor is connected with the second end of the second capacitor;
A first end of the sixth resistor is connected with the second end of the third capacitor, and the second end of the sixth resistor is connected with the negative electrode of the third power supply;
a fifth resistor, wherein a first end of the fifth resistor is connected with a first end of the tenth resistor, and a second end of the fifth resistor is connected with a second end of the third capacitor;
a seventh resistor, wherein a first end of the seventh resistor is connected with a first end of the tenth resistor;
the base electrode of the second triode is connected with the second end of the fifth resistor, and the collector electrode of the second triode is connected with the second end of the seventh resistor;
the first end of the eighth resistor is connected with the emitter of the second triode, and the second end of the eighth resistor is connected with the negative electrode of the third power supply;
the first end of the fourth capacitor is connected with the emitter of the second triode, and the second end of the fourth capacitor is connected with the negative electrode of the third power supply;
the base electrode of the third triode is connected with the second end of the seventh resistor, and the collector electrode of the third triode is connected with the first end of the tenth resistor;
And the first end of the ninth resistor is connected with the emitter of the third triode, and the second end of the ninth resistor is connected with the negative electrode of the third power supply.
2. The infrared fire source pre-warning detection system according to claim 1, wherein the infrared sensing unit includes:
a thermistor that detects infrared rays radiated from the fire source;
the first end of the compensation resistor is connected with the first end of the thermistor;
the positive electrode of the first power supply is connected with the second end of the thermistor, and the negative electrode of the first power supply is grounded;
and the anode of the second power supply is connected with the cathode of the first power supply, and the cathode of the second power supply is connected with the second end of the compensation resistor.
3. The infrared fire source pre-alarm detection system of claim 2, further comprising:
an optical unit, the optical unit comprising: the convex lens is arranged between the fire source and the thermistor, the focus of the convex lens is positioned on the thermistor, the flat mirror is arranged between the convex lens and the fire source, and the flat mirror is made of zinc sulfide materials.
4. The infrared fire source pre-warning detection system of claim 3, wherein the second amplification unit comprises:
an eleventh resistor, a first end of the eleventh resistor being connected to the first end of the tenth resistor;
the first end of the attenuator is connected with the emitter of the third triode, and the third end of the attenuator is connected with the second end of the eleventh resistor;
a twelfth resistor, a first end of which is connected with the fourth end of the attenuator, and a second end of which is connected with the negative electrode of the third power supply;
a twenty-first resistor, a first end of which is connected with a second end of the tenth resistor, and a second end of which is connected with an anode of the third power supply;
an eleventh capacitor, a first end of the eleventh capacitor is connected with a first end of the twenty-first resistor, and a second end of the eleventh capacitor is grounded;
a thirteenth resistor, a first end of the thirteenth resistor being connected to a first end of the twenty-first resistor;
the base electrode of the fourth triode is connected with the second end of the attenuator, and the collector electrode of the fourth triode is connected with the second end of the thirteenth resistor;
A fourteenth resistor, wherein a first end of the fourteenth resistor is connected with the emitter of the fourth triode, and a second end of the fourteenth resistor is connected with the negative electrode of the third power supply;
a first end of the sixth capacitor is connected with the emitter of the fourth triode, and a second end of the sixth capacitor is connected with the negative electrode of the third power supply;
a seventh capacitor, wherein a first end of the seventh capacitor is connected with a second end of the thirteenth resistor;
a seventeenth resistor, a first end of the seventeenth resistor being connected to a first end of the twenty-first resistor;
the base electrode of the fifth triode is connected with the second end of the seventh capacitor, and the collector electrode of the fifth triode is connected with the second end of the seventeenth resistor;
an eighteenth resistor, wherein a first end of the eighteenth resistor is connected with the emitter of the fifth triode, and a second end of the eighteenth resistor is connected with the negative electrode of the third power supply;
a fifteenth resistor, wherein a first end of the fifteenth resistor is connected with a second end of the seventh capacitor;
a sixteenth resistor, a first end of the sixteenth resistor being connected to a second end of the fifteenth resistor;
An eighth capacitor, wherein a first end of the eighth capacitor is connected with a first end of the sixteenth resistor, and a second end of the eighth capacitor is connected with a negative electrode of the third power supply;
a ninth capacitor, a first end of which is connected with a second end of the sixteenth resistor;
a nineteenth resistor, a first terminal of the nineteenth resistor being connected to a first terminal of the twenty-first resistor;
the base electrode of the sixth triode is connected with the second end of the ninth capacitor, and the collector electrode of the sixth triode is connected with the second end of the nineteenth resistor;
a twentieth resistor, wherein a first end of the twentieth resistor is connected with the emitter of the sixth triode, and a second end of the twentieth resistor is connected with the negative electrode of the third power supply;
a twenty-second resistor, a first end of the twenty-second resistor being connected to a first end of the twenty-first resistor;
a twenty-third resistor, wherein a first end of the twenty-third resistor is connected with a second end of the twenty-second resistor, and a second end of the twenty-third resistor is connected with a negative electrode of the third power supply;
a twenty-fourth resistor, wherein a first end of the twenty-fourth resistor is connected with a second end of the ninth capacitor;
The first end of the potentiometer is connected with the second end of the twenty-fourth resistor, and the second end of the potentiometer is connected with the third end of the potentiometer;
and the first end of the tenth capacitor is connected with the second end of the nineteenth resistor, and the second end of the tenth capacitor is connected with the third end of the potentiometer and the input end of the phase sensitive detection unit.
5. The infrared fire source pre-warning detection system of claim 4, wherein the modulation unit comprises:
the modulating disc is positioned between the fire source and the flat mirror, and is rotatably arranged relative to the flat mirror, and a light through hole is formed in the modulating disc;
the magnetic steel is arranged on the modulation disc;
the driving end of the driving unit is magnetically connected with the magnetic steel, and the driving unit drives the magnetic steel to rotate so that the light through hole rotates relative to the flat mirror.
6. The infrared fire source pre-warning detection system of claim 5, wherein the drive unit comprises:
the first inductor is magnetically connected with the magnetic steel;
a thirteenth capacitor, a first end of the thirteenth capacitor is connected with a first end of the first inductor;
The second inductor is magnetically connected with the magnetic steel, and the second end of the second inductor is connected with the second end of the first inductor;
a twelfth capacitor, a first end of which is connected to the first end of the second inductor, and a second end of which is connected to the second end of the thirteenth capacitor;
a twenty-fifth resistor, a first end of the twenty-fifth resistor being connected to the first end of the twelfth capacitor, a second end of the twenty-fifth resistor being connected to the second end of the twelfth capacitor;
the positive electrode of the fourth power supply is connected with the second end of the second inductor;
a seventh triode, wherein the seventh triode is an NPN type, the base electrode of the seventh triode is connected with the second end of the thirteenth capacitor, the collector electrode of the seventh triode is connected with the first end of the thirteenth capacitor, and the emitter electrode of the seventh triode is connected with the negative electrode of the fourth power supply;
a twenty-sixth resistor, wherein a first end of the twenty-sixth resistor is connected with the collector electrode of the seventh triode;
a twenty-seventh resistor, a first end of the twenty-seventh resistor being connected to a second end of the twenty-sixth resistor;
A fourteenth capacitor, a first end of the fourteenth capacitor is connected with the first end of the twenty-sixth resistor, and a second end of the fourteenth capacitor is connected with the second end of the twenty-sixth resistor;
the base electrode of the eighth triode is connected with the second end of the twenty-seventh resistor;
a twenty-eighth resistor, wherein the second end of the twenty-eighth resistor is connected with the collector electrode of the eighth triode;
a twenty-ninth resistor, wherein a first end of the twenty-ninth resistor is connected with the emitter of the eighth triode;
the positive electrode of the fifth power supply is connected with the first end of the twenty-eighth resistor, the negative electrode of the fifth power supply is connected with the second end of the twenty-ninth resistor, and the negative electrode of the fifth power supply is grounded;
the anode of the first diode is connected with the second end of the twenty-ninth resistor, and the cathode of the first diode is connected with the base electrode of the eighth triode;
a thirty-first resistor, a first end of the thirty-first resistor being connected to a first end of the twenty-eighth resistor;
a thirty-second resistor, a first end of the thirty-second resistor being connected to a first end of the thirty-second resistor;
A second diode, the anode of which is connected with the second end of the thirty-second resistor;
a thirty-third resistor, a first end of the thirty-third resistor being connected to the cathode of the second diode, a second end of the thirty-third resistor being connected to the second end of the twenty-ninth resistor;
a ninth triode, wherein the base electrode of the ninth triode is connected with the second end of the thirty-second resistor, the collector electrode of the ninth triode is connected with the second end of the thirty-second resistor, and the emitter electrode of the ninth triode is connected with the second end of the twenty-ninth resistor;
a fifteenth capacitor, wherein a first end of the fifteenth capacitor is connected with a second end of the twenty-eighth resistor, and a second end of the fifteenth capacitor is connected with a cathode of the second diode;
a thirty-first resistor, a first end of the thirty-first resistor being connected to a second end of the thirty-first resistor;
a thirty-fifth resistor, a first end of the thirty-fifth resistor being connected to a second end of the thirty-first resistor, a second end of the thirty-fifth resistor being connected to a second end of the thirty-third resistor;
A thirty-fourth resistor, a first end of the thirty-fourth resistor being connected to a first end of the thirty-second resistor;
a sixteenth capacitor, a first end of the sixteenth capacitor is connected with a second end of the thirty-fourth resistor, and a second end of the sixteenth capacitor is connected with a second end of the thirty-fourth resistor;
and the thirteenth electrode tube is an NPN type, the base electrode of the thirteenth electrode tube is connected with the second end of the thirty-first resistor, the collector electrode of the thirteenth electrode tube is connected with the second end of the thirty-fourth resistor, and the emitter electrode of the thirteenth electrode tube is connected with the second end of the thirty-fifth resistor.
7. The infrared fire source pre-alarm detection system of claim 6, wherein the phase sensitive detection unit further comprises:
a seventeenth capacitor, a first end of the seventeenth capacitor being connected to a second end of the thirty-first resistor;
a thirty-eighth resistor, wherein a second end of the thirty-eighth resistor is connected with a second end of the seventeenth capacitor;
a nineteenth capacitor, wherein a first end of the nineteenth capacitor is connected with a second end of the tenth capacitor;
a thirty-sixth resistor, a second terminal of the thirty-sixth resistor being connected to a second terminal of the nineteenth capacitor;
An eleventh triode, wherein the eleventh triode is PNP, the base electrode of the eleventh triode is connected with the first end of the thirty-eighth resistor, the collector electrode of the eleventh triode is connected with the negative electrode of the fifth power supply, and the emitter electrode of the eleventh triode is connected with the first end of the thirty-sixth resistor;
a thirty-ninth resistor, a second terminal of the thirty-ninth resistor being connected to a second terminal of the seventeenth capacitor;
a thirty-seventh resistor, a first end of the thirty-seventh resistor being connected to a second end of the thirty-sixth resistor;
a twelfth triode, wherein the twelfth triode is an NPN type, the base electrode of the twelfth triode is connected with the first end of the thirty-ninth resistor, the collector electrode of the twelfth triode is connected with the negative electrode of the fifth power supply, and the emitter electrode of the twelfth triode is connected with the second end of the thirty-seventh resistor;
and the first end of the eighteenth capacitor is connected with the first end of the thirty-sixth resistor and the first end of the display unit, and the second end of the eighteenth capacitor is connected with the second end of the thirty-seventh resistor and the second end of the display unit.
8. The infrared fire source pre-alarm detection system of claim 7, further comprising:
the positive electrode of the alarm unit is connected with the positive electrode of the fifth power supply, the negative electrode of the alarm unit is connected with the negative electrode of the fifth power supply, and the signal input end of the alarm unit is connected with the second end of the tenth capacitor.
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