CN105548714A - Missile-borne resistor adaptive measurement device on barrel missile and method - Google Patents
Missile-borne resistor adaptive measurement device on barrel missile and method Download PDFInfo
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- CN105548714A CN105548714A CN201610072550.3A CN201610072550A CN105548714A CN 105548714 A CN105548714 A CN 105548714A CN 201610072550 A CN201610072550 A CN 201610072550A CN 105548714 A CN105548714 A CN 105548714A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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Abstract
The invention discloses a missile-borne resistor adaptive measurement device on a barrel missile and a method, relating to the detection device and the method technology field. The missile-borne resistor adaptive measurement device comprises a constant current source, a constant voltage source, a channel/interface module, a channel control module, an amplification circuit and a analog-to-digital conversion circuit; the resistor detection terminals of various channels of the test interface of the tested barrel missile are connected to a constant current source and a constant voltage source through the channel/interface module to form a test channel; the input terminal of the amplification circuit is connected to the sampling terminal on the test channel; the output terminal of the channel control module is connected to the control terminal of the channel/interface module; the signal output terminal of the amplification circuit is connected to the signal input terminal of the n analog-to-digital conversion circuit; and the signal output terminal of the analog-to-digital conversion circuit is connected to the signal input terminal of a resistor processing and display unit. The invention is simple in measurement, high in accuracy and low in cost.
Description
Technical field
The present invention relates to pick-up unit and the method and technology field of equipment, particularly relate to a kind of resistance self-adapting measuring apparatus and method on cylinder bullet bullet.
Background technology
In guided missile development process, each cabin section is by interface and other module composition organic whole, the characteristic of these interfaces reflects the internal state of each cabin section, and on Missile Body, resistance is the resistance between two interface nodes, is also one of important indicator describing interface features.Measured by resistance, each cabin intersegmental part can be analyzed and whether there is hidden danger, the short circuit that such as internal circuit is caused by a variety of causes, open circuit, components and parts exception etc.
In addition, in order to the convenience using, store and transport, often the launching tube of guided missile and packing tube are integrated, this type of guided missile is wound packages guided missile, is called for short cylinder bullet.Cylinder bullet needs regularly to test, to ensure to realize good quality monitoring.The test of cylinder bullet is generally by resistance on test bullet, whether meets code requirement judge whether that needs overhaul according to resistance.
Generally, cylinder bullet measurement interface number of active lanes is more, and the resistance value of different passage is not quite similar, and there are 10 below Ω small resistors of more difficult measurement.If the bridge measurement resistance that service precision is higher, need to prepare too much High-precision standard resistance, when needs complete all passage resistances of test interface measure time, test process can be made too complicated and expend the too much time.And adopt voltammetry measuring resistance, then there is comparatively big error when aisle resistance is small resistor.During on cylinder bullet bullet in the past, resistance is measured, even if employ constant current source or constant pressure source method, also can be comparatively single because of circuit function, cause testing cost too high and impracticable.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of resistance self-adapting measuring apparatus and method on cylinder bullet bullet, and described apparatus and method have measures the advantage simple, precision is high, cost is low.
For solving the problems of the technologies described above, the technical solution used in the present invention is: resistance self-adapting measuring apparatus on a kind of cylinder bullet bullet, it is characterized in that: comprise constant current source, constant pressure source, passage/interface module, channel control module, amplifying circuit and analog to digital conversion circuit, the resistance test end of the various passages of described tested cylinder bullet test interface forms test channel after described passage/interface module is connected with described constant current source and constant pressure source, the input end of described amplifying circuit is connected with the sampling end in described test channel, the output terminal of described channel control module is connected with the control end of described passage/interface module, disconnect for the passage in control channel/interface module/interface or close, described amplifying circuit is used for the signal of sampling being carried out amplification process, and the signal output part of amplifying circuit is connected with the signal input part of analog-digital conversion circuit as described, the signal output part of analog-digital conversion circuit as described is connected with the signal input part of resistance process and display unit, analog to digital conversion circuit is transferred to resistance process and display unit process and the value of resistance is shown after being used for that the simulating signal after amplifying is converted to digital signal.
Further technical scheme is: described constant current source comprises power module U14, and described power module U14 uses 1 pin of LT3092, described LT3092 to be connected with 2 pin of described LT3092 after resistance R55, resistance R54 successively, and electric capacity C96 is in parallel with resistance R55; 3 pin of described LT3092 connect+5V power supply, 3 pin of LT3092 described in a termination of electric capacity C95, the other end of electric capacity C95 and the node of described resistance R54 and resistance R55.
Further technical scheme is: described constant pressure source comprises amplifier U19 and voltage source U20, described amplifier U19 uses OP97 type amplifier, described voltage source U20 uses LTC6655 type voltage source, 1 pin and 2 pin of described U20 connect+5V power supply, 3 pin of described U20 and 4 pin ground connection, filter capacitor C81 is provided with between+5V power supply and ground, 5 pin of described U20 and 8 pin ground connection, 6 pin and 7 pin of described U20 merge rear connection with 3 pin of described U19, between the output terminal that electric capacity C82 is connected to described U20 and ground; 1 pin of described U19,5 pin and 8 pin are unsettled, and 2 pin of described U19 connect 6 pin of U19, and 6 pin of described U19 are the voltage output end of described constant pressure source.
Further technical scheme is: described amplifying circuit comprises amplification chip U16 and amplification chip U18, described amplification chip U16 uses AD620, described amplification chip U18 uses OP97, one end of resistance R107 is an input end of described amplifying circuit, the other end of resistance R107 is divided into three tunnels, the first via is connected with 2 pin of U16, and the second tunnel connects through 3 pin of electric capacity C128 and U16, and the 3rd tunnel connects through 3 pin of electric capacity C126, electric capacity C127 and U16 successively; One end of resistance R108 is another input end of described amplifying circuit, and the other end of resistance R108 is connected with 3 pin of U16; 1 pin of U16 connects through 8 pin of resistance R57 and U16; The 4 pin ground connection of U16; 6 pin of U16 are the output terminal of described amplifying circuit; 7 pin of U16 connect+5V power supply, and filter capacitor C90 and electric capacity C91 is connected in parallel on this pin; 1 pin of U18,5 pin and 8 pin are unsettled; 5 pin of U16 are connect after 2 pin of U18 and 6 pin merge; Power supply is ground connection after resistance R62, resistance R63 successively, and the 3 pin connecting resistance R62 of described U18 and the node of resistance R63, the 4 pin ground connection of described U18, are parallel with electric capacity C94 between 3 pin of described U18 and 4 pin.
Further technical scheme is: analog-digital conversion circuit as described comprises modulus conversion chip U12 and voltage source chip U11, described voltage source chip U11 adopts LTC6655, described modulus conversion chip U12 adopts 1 pin of ADS1243, described U12 to connect power supply, and 2 pin and 3 pin connect crystal oscillator; 4 pin of described U12 are connected with the corresponding port of resistance process and display unit through resistance R72; The 6 pin ground connection of described U12, are provided with filter capacitor between the ground of described U12 and power supply; The 7-13 pin of described U12 is the signal input part of analog-digital conversion circuit as described; 14 pin of described U12 and 15 pin ground connection; 16 pin-20 pin of described U12 are connected with the corresponding port of resistance process and display unit respectively after resistance; 1 pin and 2 pin of described U11 connect+5V power supply, 3 pin of described U11 and 4 pin ground connection, filter capacitor C98 is provided with between+5V power supply and ground, 5 pin of described U11 and 8 pin ground connection, be connected with 5 pin of described U12 after 6 pin of described U11 and 7 pin merge, electric capacity C99 between the output terminal being connected to described U11 and ground.
The invention also discloses a kind of measuring method of described measurement mechanism, it is characterized in that: when the resistance of tested cylinder bullet is less than 10 Ω, cut logical constant current source, disconnect constant pressure source, resistance injects known constant current, then ohmically voltage to be amplified and after analog to digital conversion, resistance process and display unit utilize Voltammetric Relation formula calculate measurand actual resistance and show; When resistance is greater than 10 Ω, cut logical constant pressure source, disconnect constant current source, utilize passage bridge, to the resistance of the upper known approximate match of measured resistance series connection, then ohmically dividing potential drop to be amplified and after analog to digital conversion, resistance process and display unit utilize voltage divider principle to calculate the resistance value of measurand cylinder bullet.
Further technical scheme is: in measuring process, in order to make in passage/interface module between the positive and negative end of passage voltage difference close to the half of reference voltage, constant pressure source establishes connection three different gears, realizing especially by switching different resistance, connecting 2M Ω resistance when measured resistance is greater than 500K Ω; When measured resistance is between 20K Ω ~ 500K Ω, connect 200K Ω resistance; When measured resistance is between 400 Ω ~ 20K Ω, connect 2K Ω resistance; When measured resistance is between 40 Ω ~ 400 Ω, cut logical constant current source; When measured resistance is between 10 Ω ~ 40 Ω, connect constant current source, the enlargement factor of amplifying circuit is set to 10; When measured resistance is less than 10 Ω, cut logical constant current source, the enlargement factor of amplifying circuit is set to 40.
The beneficial effect adopting technique scheme to produce is: described apparatus and method are by arranging different measurement gears or changing driving source, the measurement of the various aisle resistance of cylinder bullet interface can be realized, not only can overcome that bridge measurement is too complicated, voltammetry measures the problems such as small resistor precision is too low, also solve conventional constant current source or constant pressure source method function singleness, problem that cost is high.
Accompanying drawing explanation
Fig. 1-2 is the theory diagram of device of the present invention;
Fig. 3 is the circuit theory diagrams of constant current source in device of the present invention;
Fig. 4 is the circuit theory diagrams of constant pressure source in device of the present invention;
Fig. 5 is the schematic diagram of amplifying circuit in device of the present invention;
Fig. 6 is the schematic diagram of analog to digital conversion circuit in device of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.
As shown in Figure 1, the invention discloses resistance self-adapting measuring apparatus on a kind of cylinder bullet bullet, comprise constant current source, constant pressure source, passage/interface module, channel control module, amplifying circuit and analog to digital conversion circuit.The resistance test end of each passage of described tested cylinder bullet test interface forms test channel after described passage/interface module is connected with described constant current source and constant pressure source, the input end of described amplifying circuit is connected with the sampling end in described test channel, the output terminal of described channel control module is connected with the control end of described passage/interface module, disconnects or close for the passage in control channel/interface module/interface; Described amplifying circuit is used for the signal of sampling being carried out amplification process, and the signal output part of amplifying circuit is connected with the signal input part of analog-digital conversion circuit as described; The signal output part of analog-digital conversion circuit as described is connected with the signal input part of resistance process and display unit, analog to digital conversion circuit be used for by amplify after simulating signal be converted to digital signal after, be transferred to resistance process and display unit process and the value of resistance is shown, described resistance process and display unit generally comprise a processor and a personal-machine interactive module, processor is used for calculating, human-computer interaction module is for showing data, wherein Fig. 2 is the further refinement to Fig. 1, is also a kind of theory diagram of device of the present invention.
As shown in Figure 3, described constant current source comprises power module U14, and described power module U14 uses 1 pin of LT3092, described LT3092 to be connected with 2 pin of described LT3092 after resistance R55, resistance R54 successively, and electric capacity C96 is in parallel with resistance R55; 3 pin of described LT3092 connect+5V power supply, 3 pin of LT3092 described in a termination of electric capacity C95, the other end of electric capacity C95 and the node of described resistance R54 and resistance R55.
Constant-current source circuit is mainly used to measure small resistor, and consider the characteristic of test product priming system, constant current source electric current must be less than initiation current, and must be reliable and stable.Adopt the LT3092 two ends programmable current source integrated chip of Linear Tech in circuit, compared to discrete device, there is higher stability.This chip has wider input voltage range, from 1.2V to 40V.By simply configuring two peripheral resistance ratios, just can obtain the output current value wanted, circuit is easy to realize.
LT3092 can realize steady current and export when not using input and output capacitor, and provides high DC and AC impedance.This feature makes this device can operate in essential safety application, meets the feature of this device measuring priming system.The SET pin of this device has 1% initial accuracy and low-temperature coefficient, can ensure the stability that this measuring equipment keeps higher in temperature variation.Current adjustment performance is better than 10ppm/V (voltage range at 1.5V to 40V).LT3092 can running (connecting with signal wire) in the configuration of a kind of two ends current source.It is applicable to for driving power very much, and as an accurate demand limiter for locally supplied power source.The internal protection circuitry of this device comprises reverse battery and reverse-current protection, current limit and thermal limit.
As shown in Figure 4, described constant pressure source comprises amplifier U19 and voltage source U20, described amplifier U19 uses OP97 type amplifier, described voltage source U20 uses LTC6655 type voltage source, and 1 pin and 2 pin of described U20 connect+5V power supply, 3 pin of described U20 and 4 pin ground connection, filter capacitor C81 is provided with between+5V power supply and ground, 5 pin of described U20 and 8 pin ground connection, 6 pin and 7 pin of described U20 merge rear connection with 3 pin of described U19, between the output terminal that electric capacity C82 is connected to described U20 and ground; 1 pin of described U19,5 pin and 8 pin are unsettled, and 2 pin of described U19 connect 6 pin of U19, and 6 pin of described U19 are the voltage output end of described constant pressure source.
Constant voltage power supply circuit adopts the LT6655 family chip of Linear Tech equally, and this chip output voltage is 3.3V.LTC6655 is the complete series of an accurate bandgap reference voltage, can provide remarkable noise and drift performance.The high resolving power that its low noise and low drifting are very suitable for required by instrument and testing apparatus is measured.And LTC6655 is in – 40oC to 125oC temperature range, has outstanding temperature characterisitic, can promote the measuring accuracy that this equipment is higher in wide temperature range.Advanced curvature compensation function make this band-gap reference can realize a drift being less than 2ppm/oC and a predictable temperature characterisitic and one reach ± output voltage the accuracy of 0.025%, thus reduce or eliminate the needs carrying out calibrating.LTC6655 can be powered by the voltage being low to moderate specific output voltage height 500mV, and also can power from the voltage up to 13.2V, circuit design is very simple.Outstanding load regulation and supply and receptivity, add super tall and erect voltage rejection, thus provide consistent performance in very wide operational range.
LT6655 peripheral circuit is extremely simple, in order to the work making it more stable, and input/output terminal each electric capacity in parallel.Consider LT665 output loading capability, system rear class adds voltage follower circuit, adopts amplifier OP97 to realize, OP97 is the low-power consumption type substitute products of industrial standard precision amplifier OP-07, its performance meets the standard set by OP07, and source current is only 600 μ A, less than the latter's 1/6.Offset voltage is low to moderate 25 μ V, and temperature drift is less than 0.6 μ V/oC.In most of circuit, do not need outside imbalance adjustment.Relative to OP07, this device improves in many aspects.Salient point is bias current, it in whole military temperature range all the time lower than 250pA.
As shown in Figure 5, described amplifying circuit comprises amplification chip U16 and amplification chip U18, described amplification chip U16 uses AD620, described amplification chip U18 uses OP97, one end of resistance R107 is an input end of described amplifying circuit, and the other end of resistance R107 is divided into three tunnels, and the first via is connected with 2 pin of U16, second tunnel connects through 3 pin of electric capacity C128 and U16, and the 3rd tunnel connects through 3 pin of electric capacity C126, electric capacity C127 and U16 successively; One end of resistance R108 is another input end of described amplifying circuit, and the other end of resistance R108 is connected with 3 pin of U16; 1 pin of U16 connects through 8 pin of resistance R57 and U16; The 4 pin ground connection of U16; 6 pin of U16 are the output terminal of described amplifying circuit; 7 pin of U16 connect+5V power supply, and filter capacitor C90 and electric capacity C91 is connected in parallel on this pin; 1 pin of U18,5 pin and 8 pin are unsettled; 5 pin of U16 are connect after 2 pin of U18 and 6 pin merge; Power supply is ground connection after resistance R62, resistance R63 successively, and the 3 pin connecting resistance R62 of described U18 and the node of resistance R63, the 4 pin ground connection of described U18, are parallel with electric capacity C94 between 3 pin of described U18 and 4 pin.
Amplifying circuit is mainly used in measuring small resistor, weak voltage on small resistor is amplified.And the precision of amplifying circuit and the linearity determine an accuracy of whole resistance measurement, temperature characterisitic is also related to the temperature stability of whole system.Adopt the AD620 integrated chip of ADI company as amplifying circuit core in system.AD620 is a high-precision meter amplifier, only needs a non-essential resistance to arrange gain, gain margin 1 to 10000.In addition AD620 maximum operating currenbt only 1.3mA, has and has less power consumption, can reduce battery system pressure, lifting means flying power.
AD620 has very high precision, and maximum nonlinearity erron is only 40ppm, and offset voltage is maximum also only has 50 μ V, and offset drift also only has 0.6 μ V/oC.Because AD620 adopts Super β eta process, the low input bias current of maximum 1nA therefore can be realized.AD620 has the low input noise of 9nV/ √ Hz when 1KHz, in 0.1Hz to 10Hz bandwidth, noise is 0.28 μ V peak-to-peak value, and input current noise is 0.1pA/ √ Hz.Above characteristic all can ensure high linearity and the high stability of amplifying circuit, adds that AD620 cost is lower, is enough to realize multichannel use.
Because system adopts lithium battery power supply, be unipolarity power supply, in order to avoid the power-switching circuit of complexity, be supplied to the bias voltage of amplifying circuit 2.5V by voltage follower circuit.
As shown in Figure 6, analog-digital conversion circuit as described comprises modulus conversion chip U12 and voltage source chip U11, and described voltage source chip U11 adopts LTC6655, and described modulus conversion chip U12 adopts 1 pin of ADS1243, described U12 to connect power supply, and 2 pin and 3 pin connect crystal oscillator; 4 pin of described U12 are connected with the corresponding port of resistance process and display unit through resistance R72; The 6 pin ground connection of described U12, are provided with filter capacitor between the ground of described U12 and power supply; The 7-13 pin of described U12 is the signal input part of analog-digital conversion circuit as described; 14 pin of described U12 and 15 pin ground connection; 16 pin-20 pin of described U12 are connected with the corresponding port of resistance process and display unit respectively after resistance; 1 pin and 2 pin of described U11 connect+5V power supply, 3 pin of described U11 and 4 pin ground connection, filter capacitor C98 is provided with between+5V power supply and ground, 5 pin of described U11 and 8 pin ground connection, be connected with 5 pin of described U12 after 6 pin of described U11 and 7 pin merge, electric capacity C99 between the output terminal being connected to described U11 and ground.
Analog to digital conversion circuit adopts the ADS1243 chip of Texas Instruments to form.ADS1243 is a high precision, wide dynamic range, delta-sigma, modulus (A/D) converter, and the working voltage of this converter is 2.7V to 5.25V and has 24 bit resolutions.This delta-sigma, A/D converter can provide the no-missing-code performance of the highest 24 and its effective resolution is 21.Internal damping can be selected for providing a very high input impedance to the direct connection of programmable amplifier or low-level voltage signal.This programmable gain amplifier (PGA) provides the selectable gain between 1 to 128, can make up the inadequate problem of amplifying circuit multiple when measuring tiny signal, and easily through programming realization.
ADS1243 has 8 analog data channels, inner by multi-way switch gating, can measure the voltage difference between any two analog interfaces, can be good at meeting the requirement of needs multimetering in native system by software programming ADS1243.In addition, chip internal is containing one 8 analog to digital converters (DAC), and it can provide a FSR(full-scale range) offset correction of 50%.A/D conversion can provide finite impulse response (FIR) able to programme (FIR) wave filter of synchronous 50Hz and 60Hz trap by a secondary delta-sigma modulator and one.The input of this benchmark is difference and can be used to ratio conversion.This serial ports and Serial Peripheral Interface (SPI) (SPI) compatibility.There is provided maximum 8 bit data I/O for input or export.ADS1243 is communicated with STM32 by SPI mouth.LT6655 family chip provides reference voltage, reference voltage 2.5V.
The invention also discloses a kind of measuring method of described measurement mechanism, described method is specific as follows: when on tested cylinder bullet bullet, resistance is less than 10 Ω, cut logical constant current source, disconnect constant pressure source, resistance injects known constant current, then ohmically voltage to be amplified and after analog to digital conversion, resistance process and display unit utilize Voltammetric Relation formula calculate measurand actual resistance and show; When resistance is greater than 10 Ω, cut logical constant pressure source, disconnect constant current source, utilize passage bridge, to the resistance of the upper known approximate match of measured resistance series connection, then ohmically dividing potential drop to be amplified and after analog to digital conversion, resistance process and display unit utilize voltage divider principle to calculate the resistance value of measurand cylinder bullet.
Further, in measuring process, in order to make in passage/interface module, between the positive and negative end of passage, voltage difference is close to the half of reference voltage, and constant pressure source establishes connection three different gears, realizing especially by switching different resistance, connecting 2M Ω resistance when measured resistance is greater than 500K Ω; When measured resistance is between 20K Ω ~ 500K Ω, connect 200K Ω resistance; When measured resistance is between 400 Ω ~ 20K Ω, connect 2K Ω resistance; When measured resistance is between 40 Ω ~ 400 Ω, cut logical constant current source; When measured resistance is between 10 Ω ~ 40 Ω, connect constant current source, the enlargement factor of amplifying circuit is set to 10; When measured resistance is less than 10 Ω, cut logical constant current source, the enlargement factor of amplifying circuit is set to 40.
The small resistance measurement of 1 below Ω: the voltage for small resistor two ends is first amplified to desired value survey calculation again with outside, simultaneously for reducing error, the mode that on line, resistance and small resistor all adopt positive and negative measurement to average is to improve measurement progress.
Described apparatus and method are by arranging different measurement gears or changing driving source, the measurement of the various aisle resistance of cylinder bullet interface can be realized, not only can overcome that bridge measurement is too complicated, voltammetry measures the problems such as small resistor precision is too low, also solve conventional constant current source or constant pressure source method function singleness, problem that cost is high.
Claims (7)
1. resistance self-adapting measuring apparatus on a cylinder bullet bullet, it is characterized in that: comprise constant current source, constant pressure source, passage/interface module, channel control module, amplifying circuit and analog to digital conversion circuit, the resistance test end of each passage of described tested cylinder bullet test interface forms test channel after described passage/interface module is connected with described constant current source and constant pressure source, the input end of described amplifying circuit is connected with the sampling end in described test channel, the output terminal of described channel control module is connected with the control end of described passage/interface module, disconnect for the passage in control channel/interface module/interface or close, described amplifying circuit is used for the signal of sampling being carried out amplification process, and the signal output part of amplifying circuit is connected with the signal input part of analog-digital conversion circuit as described, the signal output part of analog-digital conversion circuit as described is connected with the signal input part of resistance process and display unit, analog to digital conversion circuit is transferred to resistance process and display unit process and the value of resistance is shown after being used for that the simulating signal after amplifying is converted to digital signal.
2. resistance self-adapting measuring apparatus on as claimed in claim 1 bullet bullet, it is characterized in that: described constant current source comprises power module U14, described power module U14 uses LT3092,1 pin of described LT3092 is connected with 2 pin of described LT3092 successively after resistance R55, resistance R54, and electric capacity C96 is in parallel with resistance R55; 3 pin of described LT3092 connect+5V power supply, 3 pin of LT3092 described in a termination of electric capacity C95, the other end of electric capacity C95 and the node of described resistance R54 and resistance R55.
3. resistance self-adapting measuring apparatus on as claimed in claim 1 bullet bullet, it is characterized in that: described constant pressure source comprises amplifier U19 and voltage source U20, described amplifier U19 uses OP97 type amplifier, described voltage source U20 uses LTC6655 type voltage source, 1 pin and 2 pin of described U20 connect+5V power supply, 3 pin of described U20 and 4 pin ground connection, filter capacitor C81 is provided with between+5V power supply and ground, 5 pin of described U20 and 8 pin ground connection, 6 pin and 7 pin of described U20 merge rear connection with 3 pin of described U19, between the output terminal that electric capacity C82 is connected to described U20 and ground; 1 pin of described U19,5 pin and 8 pin are unsettled, and 2 pin of described U19 connect 6 pin of U19, and 6 pin of described U19 are the voltage output end of described constant pressure source.
4. resistance self-adapting measuring apparatus on as claimed in claim 1 bullet bullet, it is characterized in that: described amplifying circuit comprises amplification chip U16 and amplification chip U18, described amplification chip U16 uses AD620, described amplification chip U18 uses OP97, one end of resistance R107 is an input end of described amplifying circuit, the other end of resistance R107 is divided into three tunnels, the first via is connected with 2 pin of U16, second tunnel connects through 3 pin of electric capacity C128 and U16, and the 3rd tunnel connects through 3 pin of electric capacity C126, electric capacity C127 and U16 successively; One end of resistance R108 is another input end of described amplifying circuit, and the other end of resistance R108 is connected with 3 pin of U16; 1 pin of U16 connects through 8 pin of resistance R57 and U16; The 4 pin ground connection of U16; 6 pin of U16 are the output terminal of described amplifying circuit; 7 pin of U16 connect+5V power supply, and filter capacitor C90 and electric capacity C91 is connected in parallel on this pin; 1 pin of U18,5 pin and 8 pin are unsettled; 5 pin of U16 are connect after 2 pin of U18 and 6 pin merge; Power supply is ground connection after resistance R62, resistance R63 successively, and the 3 pin connecting resistance R62 of described U18 and the node of resistance R63, the 4 pin ground connection of described U18, are parallel with electric capacity C94 between 3 pin of described U18 and 4 pin.
5. resistance self-adapting measuring apparatus on as claimed in claim 1 bullet bullet, it is characterized in that: analog-digital conversion circuit as described comprises modulus conversion chip U12 and voltage source chip U11, described voltage source chip U11 adopts LTC6655, described modulus conversion chip U12 adopts ADS1243,1 pin of described U12 connects power supply, and 2 pin and 3 pin connect crystal oscillator; 4 pin of described U12 are connected with the corresponding port of resistance process and display unit through resistance R72; The 6 pin ground connection of described U12, are provided with filter capacitor between the ground of described U12 and power supply; The 7-13 pin of described U12 is the signal input part of analog-digital conversion circuit as described; 14 pin of described U12 and 15 pin ground connection; 16 pin-20 pin of described U12 are connected with the corresponding port of resistance process and display unit respectively after resistance; 1 pin and 2 pin of described U11 connect+5V power supply, 3 pin of described U11 and 4 pin ground connection, filter capacitor C98 is provided with between+5V power supply and ground, 5 pin of described U11 and 8 pin ground connection, be connected with 5 pin of described U12 after 6 pin of described U11 and 7 pin merge, electric capacity C99 between the output terminal being connected to described U11 and ground.
6. the measuring method as the measurement mechanism in claim 1-5 as described in any one, it is characterized in that: when the resistance of tested cylinder bullet is less than 10 Ω, cut logical constant current source, disconnect constant pressure source, resistance injects known constant current, then ohmically voltage to be amplified and after analog to digital conversion, resistance process and display unit utilize Voltammetric Relation formula calculate measurand actual resistance and show; When resistance is greater than 10 Ω, cut logical constant pressure source, disconnect constant current source, utilize passage bridge, to the resistance of the upper known approximate match of measured resistance series connection, then ohmically dividing potential drop to be amplified and after analog to digital conversion, resistance process and display unit utilize voltage divider principle to calculate the resistance value of measurand cylinder bullet.
7. the measuring method of measurement mechanism as claimed in claim 6, it is characterized in that: in measuring process, in order to make in passage/interface module between the positive and negative end of passage voltage difference close to the half of reference voltage, constant pressure source establishes connection three different gears, realizing especially by switching different resistance, connecting 2M Ω resistance when measured resistance is greater than 500K Ω; When measured resistance is between 20K Ω ~ 500K Ω, connect 200K Ω resistance; When measured resistance is between 400 Ω ~ 20K Ω, connect 2K Ω resistance; When measured resistance is between 40 Ω ~ 400 Ω, cut logical constant current source; When measured resistance is between 10 Ω ~ 40 Ω, connect constant current source, the enlargement factor of amplifying circuit is set to 10; When measured resistance is less than 10 Ω, cut logical constant current source, the enlargement factor of amplifying circuit is set to 40.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610072550.3A CN105548714A (en) | 2016-02-02 | 2016-02-02 | Missile-borne resistor adaptive measurement device on barrel missile and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610072550.3A CN105548714A (en) | 2016-02-02 | 2016-02-02 | Missile-borne resistor adaptive measurement device on barrel missile and method |
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| CN112904084A (en) * | 2019-11-19 | 2021-06-04 | 中车唐山机车车辆有限公司 | Automatic testing device and automatic testing method for bogie impedance |
| CN113671255A (en) * | 2021-07-30 | 2021-11-19 | 哈尔滨工业大学 | Measuring point configurable integrated missile-borne initiating explosive device resistance measuring system |
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