CN2458615Y - Fast linear hyperthermic device for conductive sampler - Google Patents
Fast linear hyperthermic device for conductive sampler Download PDFInfo
- Publication number
- CN2458615Y CN2458615Y CN 01211242 CN01211242U CN2458615Y CN 2458615 Y CN2458615 Y CN 2458615Y CN 01211242 CN01211242 CN 01211242 CN 01211242 U CN01211242 U CN 01211242U CN 2458615 Y CN2458615 Y CN 2458615Y
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- CN
- China
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- amplifier
- transistor
- operational amplifier
- control
- current
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Abstract
The utility model relates to a fast linear heating device for conductive samples, which is controlled by a computer and is composed of a preamplifier, a current amplifier and a numerical code converting circuit. The temperature signal of a reaction sample is sent to the computer through the preamplifier and an analog to digital conversion circuit; the inner part of the computer adopts a control algorithm and compute control quantity which is transduced into analog quantity and is outputted through the analog to digital conversion circuit; the output end of the computer is connected to the input end of the current amplifier; the output end of the current amplifier is connected to a tantalum wire heating body in ultra-high vacuum; thermal conduction is used for heating samples. The utility model collects temperature control and data acquisition in one body and has the advantages of high temperature control precision, high heating rate, wide range and good linearity degree.
Description
The utility model relates to a kind of fast linear conducting sample temperature raising unit in the ultrahigh vacuum thermal desorption spectroscopy, TDS that is applicable to.
Thermal desorption experiment under the ultrahigh vacuum is conducting sample mostly, and the direct current resistance of itself is very little, and the heating of sample, annealing generally all require fast linear to heat up.At present, the general electric furnace that adopts of heating by control 220V voltage, is disconnected by computer hardwares such as manual operation intensification instrument, data acquisition and control, and can only control conventional calandria, but the intensification of uncontrollable electric conduction of heating sample.
The purpose of this utility model provides a kind of accuracy of temperature control height, heating rate height, wide ranges, fast linear conducting sample temperature raising unit that the linearity is good.
The technical solution of the utility model is: by computer control, form by prime amplifier, current amplifier, digital change-over circuit, the temperature signal of response sample is sent to computing machine through prime amplifier, analog to digital conversion circuit, in computing machine, adopt control algolithm, calculate controlled quentity controlled variable and be converted to analog quantity output by D/A converting circuit, the output terminal of computing machine is received the input end of current amplifier, the output terminal of current amplifier is received the tantalum silk calandria in the ultrahigh vacuum, comes heated sample by heat conduction;
Described current amplifier bag handle: transformer; the bridge rectifier of forming by the first～four diode; the wave filter of forming by the first～two electric capacity; by feedback resistance; second～four-operational amplifier; the first～two relay; the current foldback circuit that the time relay and the 12～13 transistors are formed; by the first～ten semiconductor triode of parallel connection and the power amplifier of not forming at the first～ten resistance of its emitter; the control circuit of forming by first operational amplifier and the 14 transistor; wherein: the transformer input connects city's alternating current; output terminal is through bridge rectifier; wave filter is to the power amplifier input end; described power amplifier control end is the A point; the 14 transistor output terminal from control circuit; the power amplifier output terminal is the E point; be connected with tantalum wire through feedback resistance; described feedback resistance two ends connect to the overcurrent protector second; behind the four-operational amplifier respectively to the 12～13 transistor; the 12 transistor is connected with the time relay with the first～two relay; the first～two relay other end is to transformer; the 13 transistor collector control end is from the node D place of first operational amplifier and the 14 transistor in the control circuit; the 3rd operational amplifier positive terminal through second switch to the four-operational amplifier negative phase end that is provided with overcurrent protection second potentiometer; or link to each other with second operational amplifier output: the first operational amplifier positive terminal in the control circuit links to each other with computing machine through first switch, or links to each other with manual control first potentiometer.
The utlity model has following advantage:
1. the utility model integrates temperature control and data acquisition, has improved temperature control precision, has characteristics such as heating rate height, intensification wide ranges and the linearity are good, heating rate scope 1-80K/Sec, intensification scope 100-1500K.
2. the utility model is suitable for the linear temperature increase of conducting sample.Its intensification linearity is ± 0.5K, its fast linear temperature programme be general temperature controller can't reach; The utility model can manually be controlled again in programmed control, and has overcurrent protection function, can set protective current arbitrarily, prevents the excessive infringement sample of output current.
Fig. 1 is the utility model structural representation block diagram.
Fig. 2 is the utility model current amplifier circuit schematic diagram.
Fig. 3 is the intensification straight line of the utility model friction speed.
Fig. 4 be under the utility model room temperature CO at the desorption by heating spectrogram of clean Pt (110) surface adsorption.
Below in conjunction with accompanying drawing the utility model structure and principle of work are described in further detail.
As shown in Figure 1, the utility model is by computer control, form by prime amplifier 1, current amplifier 5, digital change-over circuit, the temperature signal of response sample 6 is sent to computing machine 3 through prime amplifier 1, analog to digital conversion circuit 2, in computing machine 3, adopt control algolithm, calculate controlled quentity controlled variable and be converted to analog quantity output by D/A converting circuit 4, the output terminal of computing machine 3 is received the input end of current amplifier 5, the output terminal of current amplifier 5 is received the tantalum silk calandria in the ultrahigh vacuum, comes heated sample by heat conduction;
As shown in Figure 2, described current amplifier 5 comprises: transformer Tr, the bridge rectifier of being made up of the first～four diode D1-D4, by the first～two capacitor C
1, C
2The wave filter of forming, by feedback resistance R
f, second～four-operational amplifier A2-A4, the first～two relay P1, P2, time relay P3 and the 12～13 transistor T
12-T
13The current foldback circuit that is fine into is by the first～ten semiconductor triode T of parallel connection
1～T
11With the power amplifier of the first～ten resistance R, the 1～R10 composition that is located at its emitter, by first operational amplifier A 1 and the 14 transistor T
14The control circuit of forming, wherein: transformer Tr input connects city's alternating current, output terminal through bridge rectifier, wave filter to the power amplifier input end, described power amplifier control end is the A point, the 14 transistor T14 output terminal from control circuit, the power amplifier output terminal is the E point, through feedback resistance R
fBe connected described feedback resistance R with tantalum wire 7
fTwo ends connect to the overcurrent protector second, four-operational amplifier A2, behind the A4 respectively to the 12～13 transistor T12-T13, the 12 transistor T12 is connected with time relay P3 with the first～two relay P1～P2, the first～two relay P1, the P2 other end is to transformer Tr, the 13 transistor T13 collector control end is from the node D place of first operational amplifier A 1 and the 14 transistor T14 in the control circuit, the 3rd operational amplifier A 3 positive terminal, or link to each other with the output of second operational amplifier A 2 to four-operational amplifier (A4) negative phase end that is provided with the overcurrent protection second potentiometer SW2 through second switch K2; First operational amplifier A, 1 positive terminal in the control circuit links to each other with computing machine through first K switch 1, or links to each other with the manual control first potentiometer SW1;
Computer-controlled program described in the utility model is: the operation beginning at first will be imported controlled variable such as heating rate, maximum temperature, in the program run by on certain period T collected specimens temperature signal, according to the difference Δ T of the temperature T s that sets with actual temperature Tp
N, calculate controlled quentity controlled variable Y (Y=P
1 *(Δ T
N+ T
*(∑ Δ T)/P
2+ P
3 *(Δ T
N-Δ T
(N-1))/T}, wherein P
1, P
2, P
3Be respectively the regulation and control parameter, Δ T is for the first time to the n time temperature difference sum that adds up, calculate controlled quentity controlled variable and output back preservation data at every turn, and judge whether to press stop key, whether reach maximum temperature, do not stop, when not reaching maximum temperature, continue the temperature signal on the collected specimens, otherwise judge whether to restart.
As shown in Figure 3, the intensification situation of three kinds of different heating rates of table the utility model, its intensification linearity is ± 0.5K;
As shown in Figure 4, at room temperature CO is in the desorption by heating spectrum of clean Pt (110) surface adsorption for table the utility model, and heating rate is 8K/sec.
The utility model principle of work is:
Analyzed conducting sample is placed on the calandria tantalum wire 7 of 8 li of ultra high vacuum containers, select different thermopairs to come detected temperatures according to the intensification scope, the thermopair electric welding is at the back side of sample 6, the thermoelectrical potential of thermopair output outputs to the analog to digital converter 2 with photoelectricity isolation, multi-channel conversion circuit by the 0-5V signal that temperature prime amplifier 1 is enlarged into standard, be sent to computing machine 3 then, by the input end of D/A converting circuit output 0-10V control signal to current amplifier;
The 220V alternating voltage drops to 10V through transformer Tr, and rectifying and wave-filtering becomes about 14V DC voltage then.Current amplifier is that input end C is added with the 14V DC voltage, output terminal E is connected with tantalum wire 7, and control end B is controlled by the control signal control of computing machine 3 outputs, the output current of power amplifier is big when control signal is big, when control signal hour output current is little, reach the temperature of control sample 6 thus; 80 amperes of the maximum output currents of current amplifier, 6 volts of output voltages, the heating of suitable especially conducting sample 6;
Current amplifier can also can manually be controlled by computing machine 3 controls.First K switch 1 is placed 2 positions, regulate the heating-up temperature that the first potentiometer SW1 can manually control sample 6; Second switch K2 is placed 2 positions, regulate the second potentiometer SW2 and can not decide protective current, whenever heating current during greater than protective current; circuit meeting automatic cutout circuit; after waiting for certain hour, recover normal condition again, can continue heating by RESET knob circuit.
The time relay described in the utility model adopts H3FA, the first～ten semiconductor triode T
1-T
11Adopt 2SD114, the 12～14 transistor T
12-T
14Adopt 2SC959, first～four-operational amplifier A1～A4 adopts MC1458CP.
Claims (3)
1. fast linear conducting sample temperature raising unit, it is characterized in that: by computer control, by prime amplifier (1), current amplifier (5), digital change-over circuit is formed, with the temperature signal of response sample (6) through prime amplifier (1), analog to digital conversion circuit (2) is sent to computing machine (3), in computing machine (3), adopt control algolithm, calculate controlled quentity controlled variable and be converted to analog quantity output by D/A converting circuit (4), the output terminal of computing machine (3) is received the input end of current amplifier (5), the output terminal of current amplifier (5) is received tantalum wire (7) calandria in the ultrahigh vacuum, comes heated sample by heat conduction.
2. according to the described fast linear conducting sample temperature raising unit of claim 1, it is characterized in that: described current amplifier (5) comprising: transformer (Tr), the bridge rectifier of being made up of the first～four diode (D1-D4), by the first～two electric capacity (C
1, C
2) form wave filter, by feedback resistance (R
f), second～four-operational amplifier (A2-A4), the first～two relay (P1, P2), the time relay (P3) and the 12～13 transistor (T
12-T
13) current foldback circuit formed, by the first～ten semiconductor triode (T of parallel connection
1～T
11) and be located at its emitter the first～ten resistance (power amplifier that R1～R10) forms, by first operational amplifier (A1) and the 14 transistor (T
14) control circuit formed, wherein: transformer (Tr) input connects city's alternating current, output terminal through bridge rectifier, wave filter to the power amplifier input end, described power amplifier control end is the A point, the 14 transistor (T14) output terminal from control circuit, the power amplifier output terminal is the E point, through feedback resistance (R
f) be connected described feedback resistance (R with tantalum wire (7)
f) two ends connect to the overcurrent protector second, four-operational amplifier (A2, A4) after respectively to the 12～13 transistor (T12-T13), the 12 transistor (T12) and the first～two relay (P1～P2) be connected with the time relay (P3), the first～two relay (P1, P2) other end is to transformer (Tr), the 13 transistor (T13) collector control end is from the node D place of first operational amplifier (A1) in the control circuit with the 14 transistor (T14), the 3rd operational amplifier (A3) positive terminal, or links to each other with second operational amplifier (A2) output to four-operational amplifier (A4) negative phase end that does not have overcurrent protection second potentiometer (SW2) through second switch (K2); First operational amplifier (A1) positive terminal in the control circuit links to each other with computing machine through first switch (K1), or links to each other with manual control first potentiometer (SW1).
3. by the described fast linear conducting sample temperature raising unit of claim 1, it is characterized in that: described calandria is tantalum wire (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01211242 CN2458615Y (en) | 2001-01-05 | 2001-01-05 | Fast linear hyperthermic device for conductive sampler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01211242 CN2458615Y (en) | 2001-01-05 | 2001-01-05 | Fast linear hyperthermic device for conductive sampler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2458615Y true CN2458615Y (en) | 2001-11-07 |
Family
ID=33630664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01211242 Expired - Fee Related CN2458615Y (en) | 2001-01-05 | 2001-01-05 | Fast linear hyperthermic device for conductive sampler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2458615Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444331A (en) * | 2018-09-30 | 2019-03-08 | 中国科学技术大学 | A kind of ultrahigh vacuum heating device and its heating means |
-
2001
- 2001-01-05 CN CN 01211242 patent/CN2458615Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444331A (en) * | 2018-09-30 | 2019-03-08 | 中国科学技术大学 | A kind of ultrahigh vacuum heating device and its heating means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |