CN2285470Y - Instrument for investigating fabric radiation-resistant thermal property - Google Patents

Abstract

The utility model relates to a test instrument for testing fabric radiation-resistant thermal property, which is provided a thermal radiation environmental simulator. The simulator is a seal cylindrical cavity with a water jacket; an infrared source, a fabric holder, a thermal detector, an environmental temperature sensor, etc. are arranged in the cylindrical cavity; the inner side of the cylindrical cavity is also provided with a signal collecting and processing device which treats a single chip computer system as a core. The instrument can simulate a pure radiation thermal exchange environment, which not only can eliminate the influence of the test caused by atmospheric environment but also can keep the stability of the test environment to make the test exact and reliable; a microcomputer system which is adopted by the instrument makes the test process automation and operation convenient at the same time.

Description

Fabric radiation proof thermal performance test instrument

The utility model is a kind of fabric radiation proof thermal performance test instrument.

To be test fabric exist under the condition in hyperthermia radiation source in actual production is used in the test of fabric radiation proof thermal behavior, radiation heat from the one side of fabric when another side transmits, to the influence degree of human body skin.Clothes itself can provide the most direct physical protection, make it to form a barrier between infrared source and human body, hinder the injury of heat to human body.Therefore, consider that the test emphasis of fabric radiation proof thermal behavior is to measure the radiation heat quantity that sees through fabric to cause the human body skin surface required time (to call the equivalent solar heat protection time in the following text) of different burn degree with heat radiation from physiological angle.In prior art, the test of fabric radiation proof thermal behavior does not also have instrumentation.Generally be to adopt a kind of infrared bulb, adopt infrared radiometer, and tested fabric is placed between radiation source and the receiver tests as receiver as radiation source.Because whole test process is carried out under the atmospheric conditions of not having sealing, therefore very easily be subjected to the environmental change factor as the influence of wind speed, temperature, humidity etc., the uncertainty such as heat conduction, convection current that has comprised quite a few in the radiation heat, make that the order of accuarcy of test data is very low, making does not have comparability between the sample of forward and backward test yet.Simultaneously, also very low, the operation inconvenience of test process automation degree.

The purpose of this utility model is in order to overcome the deficiency in the prior art, a kind of closed and intelligent fabric radiation proof thermal performance test instrument is provided,, makes test data accurately, reliably to eliminate the influence of atmospheric environment to test, simultaneously, also make test process automation.

For achieving the above object, solution of the present utility model is as follows: this tester has a heat radiation environment simulator, this simulator is a cylindrical cavity that has water jacket, the two-port of this cylindrical cavity is by chamber lid sealing, on water jacket, be provided with water inlet and water delivering orifice, cover at annular seal space and to be provided with vacuum exhaust pipe, in cylindrical cavity, be provided with infrared source, fabric clamper, heat radiation collector and thermal detector and environment temperature sensor; It is the setting that signals collecting and the processor of core is used for the required radiation temperature of different burn degree with the Single Chip Microcomputer (SCM) system that this tester also has one, the storage and the demonstration of the data acquisition of thermal radiation temperature and environment temperature and processing and the time dependent data of heat radiation incident temperature, the control of the timing of equivalent solar heat protection time and the storage of timing result and demonstration and whole test process, this signals collecting and processor comprise the hot-probing signal amplifier, the environment temperature sensor circuit, multi-way switch, A/D converter, single-chip microcomputer basic configuration unit, keyboard and digital display interface circuit, keyboard and nixie display and infrared source control circuit.

By above-mentioned solution as can be seen, the heat radiation environment simulator in this instrument is airtight, vacuum-pumping, and the environment temperature in the chamber can keep constant by the cool circulation water in the water jacket.Therefore, it can simulate the environment of pure radiation heat transfer.This has not only eliminated the influence of atmospheric environment to test, has also kept the stability of test environment, and the accuracy of measurement data is improved greatly.Owing to be provided with this simulator, can also record the data that under atmospheric conditions, can't record, as: can record under the condition of different vacuum tightnesss the radiation protection ability of same fabric.Simultaneously, the microsystem that adopts in this instrument makes test process automation.Therefore, superiority of the present utility model is that measurement is accurate, reliable, automaticity is high.

Describe its structure and principle of work in detail according to embodiment below.

Fig. 1, the utility model one-piece construction synoptic diagram.

Fig. 2, test philosophy block scheme of the present utility model.

Fig. 3, the electrical schematic diagram of hot-probing signal amplifier.

Fig. 4, the electrical schematic diagram of environment temperature sensor circuit.

Fig. 5, the electrical schematic diagram of infrared source control circuit.

Fig. 6, the electrical schematic diagram of signals collecting, single machine unit, keyboard and display part.

Referring to 1, (1) is the described cylindrical cavity that has water jacket (2), the two-port of this cylindrical cavity seals with chamber lid (3), (4), water inlet (6) by water jacket (2) and water delivering orifice (5) communicate with water source and blowoff basin, can in water jacket, form cool circulation water, can guarantee that like this environment temperature in the cavity is constant in certain temperature range.Be provided with a vacuum exhaust pipe (7) on chamber lid (3), it links to each other with tensimeter (9) with vacuum pump (8).Can be to vacuumizing in the cavity by vacuum pump, but the vacuum tightness in the tensimeter test chamber.The described infrared source that is located in the cavity adopts infrared light supply (10), and its radiation intensity can be passed through pressure regulator (11) and regulate.Thermal detector (12) is selected thermopile detector for use, and it is as thermal-radiating receiver.Because the thermopile detector receiving area is very little, for the radiations heat energy that makes the fabric back is all fallen on the thermoelectric pile, has added a heat radiation collector in the fabric back, this collector adopts Cassegrain reflection concentration type system (13).Described fabric by fabric clamper (14) be seated in infrared source (10) and heat radiation collector (13) between.Described environment temperature sensor (15) is located at thermal detector one side, on its not far position.(16) are signals collecting and processor among the figure.

Referring to Fig. 2, in test process, single-chip microcomputer (18) opens and shuts off by infrared source control circuit (19) control infrared source (22), also hot-probing signal and environment temperature transducing signal are carried out circle collection and mould, number conversion by signal picker (20), then the two paths of signals of being gathered is carried out digital processing, this digital processing comprises digital filtering, the hot-probing data is carried out the compensation of gamma correction and environment temperature.In the process of whole test, single-chip microcomputer will will be stored every a time interval (as: every 10 seconds) handled data and show, and initial temperature value (29～31 ℃) or final temperature value (the required temperature value of a certain burn degree) with the data after handling and the equivalent solar heat protection time that sets compare judgement, thereby the beginning or the termination of the timing of control internal timer.By the keyboard setting, single-chip microcomputer can obtain the temperature value of a certain burn degree of selected setting before the test beginning, in test, single-chip microcomputer can be subjected to order to show conversion, makes display when showing that probe temperature changes, and can monitor the variation of environment temperature again; During end of test (EOT), single-chip microcomputer can be made will handling the hot-probing data every a time interval and carrying out successively that temperature value shows and the demonstration of equivalent solar heat protection time, according to these data, can draw the time dependent family curve of hot-probing temperature and learn the size of equivalent solar heat protection time.

Referring to Fig. 3, described hot-probing signal amplifier is made of prime amplifier A1, two utmost point amplifier A2, reference power supply (25), compositor A3 and wave filter (26).Wherein, reference power supply is made up of voltage stabilizing integrated device AD580 and follower A4, and it exports a constant forward voltage values, and detectable signal is raised, and makes it all to become forward voltage, to satisfy the requirement of mould, number conversion.Filtering circuit is an anti-jamming circuit, and it can eliminate city's interference of signal frequently, improves measuring accuracy.Adjust potentiometer (24), (27), (28), (29) in the circuit, make dut temperature when 0～150 ℃ of scope, the spoke degree of output voltage V 01 is limited in the scope of A/D converter permission.

Referring to Fig. 4, described environment temperature sensor circuit is one and is connected into constant-current source circuit by temperature sensor AD 590, potentiometer (30), resistance (31) and direct supply Vcc.Wherein the constant-current characteristics of temperature sensor AD590 is very good, and the temperature variant family curve of its continuous current is a linear relationship.By adjusting potentiometer (30), the amplitude of output voltage V 02 is limited in the scope of A/D converter permission.

Referring to Fig. 5, described infrared source control circuit is made up of electromagnetic relay J, led lighting indicating circuit (32), capacitance-resistance anti-jamming circuit (33).When the P3.2 of single-chip microcomputer mouth output low level infrared source enabling signal, electromagnetic relay gets electric and moves, i.e. its normally opened contact J1, J2 closure, and then bright, the pressure regulator (11) of light emitting diode is the infrared light supply power supply.When P3.2 mouth output high level stop signal, the electromagnetic relay dead electricity, then light emitting diode extinguishes, pressure regulator (11) dead electricity, infrared light supply extinguishes.

Referring to Fig. 6, described single-chip microcomputer basic configuration unit is made of single-chip microcomputer 8031, program storage 2764, address latch 373 and data-carrier store 6116.Described signal picker is made up of multi-way switch CD4051, A/D converter 14433.Wherein gating end A, the B of multi-way switch CD4051 and the P3 mouth of single-chip microcomputer join, the analog quantity V01 of hot-probing signal and the analog quantity V02 of ambient temperature signal send into from the IN0 and the IN1 end of multi-way switch, export from 3 pin behind the gating, give the analog quantity input end Vx of A/D converter, after the A/D conversion, the binary-coded decimal of V01 and V02 is exported in parallel output terminal mouth Q0～Q3 and DS1～DS4 timesharing by device in turn, delivers to the P1 mouth of single-chip microcomputer.Device 1403 in the circuit is source of stable pressure, and it provides reference voltage for the reference voltage terminal VR of A/D converter.The EOC of A/D converter and DU end join with the T1 end of single-chip microcomputer, in order to realize the mode of conversion continuously.Because the output characteristics (being the thermopower curve of incident temperature and output) of thermopile detector has very big non-linear, therefore, the incident temperature value of the digital quantity representative of process A/D conversion produces deviation with actual incident temperature value, so single-chip microcomputer will carry out gamma correction to the digital quantity of A/D conversion, reason software programming herein realizes.Concrete grammar is: at first the output characteristics of thermoelectric pile is carried out digital quantity and demarcate, promptly under environment temperature is 20 ℃ condition, the incident temperature is measured every 5 ℃ A/D conversion value, adopted method of interpolation that the temperature value calculating of middle each point is obtained then, be accurate to 0.1 ℃.Interpolation formula is: $Y=\frac{X-X1}{X2-X1}(X2-X1)+Y1$ The digital quantity of X representative after the A/D conversion in the formula, X1 is the low digital quantity value adjacent with X, and X2 is the high digital quantity value adjacent with X, and Y1 is the temperature value corresponding with X1, and Y2 is the temperature value corresponding with X2, Y is the temperature value corresponding with X, i.e. the dut temperature value.Y value and the X value calculated are listed corresponding tables, be solidificated in the program storage, show according to this, the digital quantity that single-chip microcomputer can A/D be changed is to table look-up in the address, can draw the corrected value of correspondence.Again owing to the demarcation of thermoelectric pile is carried out in the time of 20 ℃, therefore, in actual test process, actual environment temperature and standard ambient temperature produce deviation, utilize software to compensate for adopting the cold junction revised law in this this example, and correction formula is: when tn＞t0, E (t, t0)=and E (t, tn)-E (tn, t0); When tn＜t0, and E (t, t0)=E (t, tn)+E (tn, t0), t0 is a standard ring temperature in the formula, and tn is the actual rings temperature, and t is a dut temperature.Described demonstration, keyboard interface circuit are made of programmable keyboard, display interface device 8279, and it can finish the keyboard input and LED shows two kinds of functions of control, and all functions all can realize by programming.It with the interface of single-chip microcomputer except that data line, RST, WR, RD end directly with single-chip microcomputer connects, clock CLK is provided by the ALE end, A0 is selected by address wire, interrupt request end IRQ links to each other with the TNT1 end of single-chip microcomputer through phase inverter, the sheet of sheet choosing end CS and data-carrier store 6116 selects end signal to provide by code translator (39), and provides sheet a collection of selected materials coded signal by the P2.5～P2.7 end of single-chip microcomputer.A0～the A3 of device 8279 and B0～B3 port is that display (34) section of providing is selected signal, and is added to respectively on the bits per inch sign indicating number display by driver (35); Its SL1～SL2 port is that display (34) provides the position to select signal, and receives on the bits per inch sign indicating number display by code translator (36), reverser (37), driver (38).Simultaneously code translator (36) is also for keyboard provides sweep trace, and receives the coded signal that keyboard is keyed in by RL2～RL6 port of device 8279, judges it is which key is pressed thus.This tester is provided with five function keys altogether and links to each other with device 8279, and they are: preset condition key PRG, thermal source start key SET, test starting key START, environment temperature display key and read key READ.The The software of this tester be modular construction, promptly be that whole procedure is divided into plurality of modules according to the difference of keypress function, all kinds of programmings respectively, and the work of this tester is controlled by keyboard operation fully.The tester operating process is: during the tester energized, at first press the preset condition key, then single-chip microcomputer is carried out preset condition key service routine, at this moment, can select to be provided with the temperature value of a certain burn degree; Press the thermal source start key again, single-chip microcomputer is carried out thermal source start key service routine, i.e. P3.2 mouth output low level, and then infrared source is started working; The 3rd step was pressed the test starting key, single-chip microcomputer is carried out test starting key service routine, promptly hot-probing and ambient temperature signal are carried out circle collection and processing, the equivalent solar heat protection time is carried out timing, and measurement result stored and show, when the hot-probing temperature of incident arrives preset temperature value, automatically shut down thermal source and stop test; In test process, if press the environment temperature display key, single-chip microcomputer execution environment temperature display key service routine, i.e. display environment temperature value on display returns to the show state of hot-probing temperature again after several seconds.After test finishes, press and read key, single-chip microcomputer is carried out and is read the key service routine, and promptly single-chip microcomputer will show the equivalent solar heat protection time at last according to the number of times that pushes button according to being presented on the display every 10 seconds hot-probing intensification value.

Claims (2)

1, a kind of fabric radiation proof thermal performance test instrument is characterized in that:

A, has a heat radiation environment simulator, this simulator is a cylindrical cavity (1) that has water jacket (2), the two-port of this cylindrical cavity is by chamber lid (3), (4) sealing, on water jacket, be provided with water inlet (6) and water delivering orifice (5), cover at annular seal space and to be provided with vacuum exhaust pipe (7), in cylindrical cavity, be provided with infrared source (10), fabric clamper (14), heat radiation collector (13) and thermal detector (12) and environment temperature sensor (15);

B, also having one is the setting that signals collecting and the processor (16) of core is used for the required radiation temperature of different burn degree with the Single Chip Microcomputer (SCM) system, the storage and the demonstration of the data acquisition of thermal radiation temperature and environment temperature and processing and the time dependent data of heat radiation incident temperature, the control of the timing of equivalent solar heat protection time and the storage of timing result and demonstration and whole test process, this signals collecting and processor comprise the hot-probing signal amplifier, the environment temperature sensor circuit, multi-way switch, A/D converter, single-chip microcomputer basic configuration unit, keyboard and digital display interface circuit, keyboard and nixie display and infrared source control circuit.

2, fabric radiation proof thermal performance test instrument as claimed in claim 1 is characterized in that: described thermal detector (12) adopts thermopile detector, and described environment temperature sensor adopts temperature sensor AD 590.

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