CN2090059U - Intelligent multi-run mineral thermoelectrometer - Google Patents

Abstract

The utility model relates to an intelligent multi-channel mineral thermoelectric instrument which is an instrument adopting the control of a single chip microcomputer to measure the thermoelectric property of the semiconductor mineral. The intelligent multi-run mineral thermoelectric instrument adopts the control of a single chip microcomputer. A sample heating table adopts a bar-shaped heating table with a plurality of electrodes, and the number of the electrodes is from 5 to 8. A temperature difference constant control device and a state buzzer are arranged in a main machine. The intelligent multi-run mineral thermoelectric instrument can simultaneously measure the thermoelectric coefficient and the thermoelectric curve of the mineral substances with a plurality of channels, the thermoelectric curve and the data table of each channel are automatically drawn by a drawing printer, and the automatic, rapid and canonical measurement of the thermoelectric property of the mineral is realized. The utility model has the advantages of simple structure, reliable performance, convenient manufacture, strong practicability, etc. and is particularly suitable for geology general investigation and geological mineralogy research.

Description

Intelligent multi-run mineral thermoelectrometer

The utility model is a kind of employing single science of computers control technology, measures the instrument of semiconductor mineral thermoelectricity capability, belongs to the mineral thermoelectric technical field of performance test.

The typomorphic peculiarities that the thermoelectric property of semiconductor mineral (as pyrite etc.) can be used as mineral is applied to geological prospecting and research.Domestic Liaoning Province geological experiment center (Shenyang) has developed " mineral thermoelectric figure spectrometer " in 1986.The Chinese Geology Univ. (Beijing) has developed the field geology scene that is applied in 1989, for " the portable type thermoelectric measurement instrument " of professional's use.The two all belongs to the analogue type instrument, does not have the advantage of microcomputerized control technology, and only measures for single track, and efficient is low.From use angle, the former operates loaded down with trivial details, and display result also need manually be made a copy of, and measures time-consumingly, and labour intensity is big.Cold junction temperature often needs manual the accent in mensuration, can not realize the cold and hot end temperature difference to cold junction temperature change from motion tracking, reduced the correctness of measured result.The latter has realized the operation on the spot of the pyroelecthc properties on the open-air rock sample, but and the direct-reading Seebeck coefficient, but can not measure the change curve of pyroelecthc properties with temperature.Too small because of the hot junction heating power again, the electrode volume is little, thermal capacitance is little, and hot-side temperature is subject to the influence of ambient air flow, can not guarantee the stability of hot-side temperature.Temperature difference value is too small, and the gained thermoelectrical potential is also little, has reduced the mensuration precision, adopts hand by contacting between electrode and the sample.Though flexibly, make the gained data have very big operate miss, influenced the accuracy of data because of firmly uneven.

The purpose of this utility model is at the deficiencies in the prior art, and a kind of multiple tracks mineral thermoelectric instrument that adopts microcomputerized control is provided.It not only can measure the Seebeck coefficient of mineral under the constant temperature difference, and can print thermoelectrical potential, Seebeck coefficient automatically and calculate every related parameter that has.

The utility model is made up of main frame, sample warm table and drawing printer, is characterized in that main frame adopts controlled by single chip microprocessor, and the sample warm table is the hot platform of multi-electrode, adopts 5～8 cold junction electrodes usually.That the hot platform of multi-electrode can adopt is square, rectangle or disc-shaped structure, for the ease of controlling the homogeneity of hot platform temperature, preferably adopts the hot platform of bar shaped.The hot platform of multi-electrode bar shaped adopts the bar shaped horizontal type structure, is made of the hot platen that can hold 5～8 electrodes, cold junction electrode, well heater, temperature detect switch (TDS) and cooling fan.In order to make each cold junction electrode temperature unanimity, should shorten each cold junction gaps between electrodes as far as possible, the gap is 4～7 millimeters.The cold junction electrode adopts the hollow aluminium alloy pipe to make, and the cold junction temperature sensor is placed in the hollow aluminium alloy pipe, and it is closely contacted with electrode.

The utility model compared with prior art, have the following advantages: owing to adopt the microcomputerized control technology, instrument can multi-channel measurement mineral thermoelectric curve, and draw the thermoelectric curve in each road and tables of data automatically, realize mineral thermoelectric automatically, fast, standard measures, be specially adapted to reconnaissance geological survey and look in the ore deposit mensuration of quality sample and data processing in batches.Hot platform adopts the multi-electrode strip structure, once can measure many mineral samplers simultaneously, has improved determination efficiency.Furnace temperature has automatic following function to cold junction temperature, has realized the automatic constant control of the cold and hot temperature difference, has improved the reliability of data.Under the constant temperature difference, measure the Seebeck coefficient, can also under the alternating temperature difference, measure thermoelectric curve.When measuring Seebeck coefficient, can calculate and print P, N conductivity type granule number and total thermoelectrical potential value, compensation thermoelectrical potential value and compensation Seebeck coefficient etc. has related parameter.When measuring thermoelectric curve, can draw thermoelectric curve and print temperature thermoelectrical potential value corresponding tables.Characteristics such as this instrument adopts computer technology, by the software combination, simplifies the structure, and it is little, in light weight, easy to operate, easy to make to have a volume, practical.

Fig. 1 is a structural representation of the present utility model; Fig. 2 is a temperature difference autotracking unit circuit theory diagrams.

The utility model can adopt scheme shown in the drawings to realize.As shown in Figure 1, tested many semiconductor mineral samples are loaded on the hot platform of bar shaped (2), make a plurality of cold junction electrodes (3) contact with it respectively.After hot platform was by temperature-adjusting circuit (12) and temperature control switch (7) control heating, just produced thermoelectromotive force (when tested mineral were P-type conduction, cold junction was for just, and the hot junction is for bearing at the cold and hot two ends of sample; Otherwise N type conduction then).The electromotive force of each road cold junction is delivered to sampling holder (5) behind impedance conversion and multiple tracks amplifier (4), the sampling or hold mode is controlled by controlled by single chip microprocessor plate (1), (6) are the multiple tracks switches.Controlled by single chip microprocessor plate (1) is by three address wires gating 1～5 road (or 1～8 road) thermoelectrical potential signal one by one, and be converted into digital signal, handle again and be calculated as several parameters commonly used, print and can repeat copy one by one by drawing printer (15).For the temperature difference that can keep cold junction and hot junction is constant, the constant control device of the temperature difference can be set, it is made of cold junction temperature sensor amplifier (8), hot-side temperature sensor amplifier (9) and temperature difference autotracking unit (10).When instrument is operated in mensuration Seebeck coefficient state, cold and hot end is remained on the constant temperature approach.When the cold junction electrode temperature changes because of room temperature or Yin Retai baking when changing, hot platform temperature will be adjusted automatically, follows the tracks of the variation of cold junction temperature, to keep the constant of the temperature difference.When instrument is operated in the thermoelectric curve state of mensuration, attemperating unit again can be under computer control, make the stepped rising of the cold and hot end temperature difference, instrument will write down the thermoelectrical potential value in each road under the different temperature difference one by one, finally draw the thermoelectric curve in each road, print the respective value of temperature and electromotive force by drawing printer (15).Cooling fan (11) is by fan governor (13) control, and after a batch sample had been surveyed, fan was opened automatically, quickens hot platform and lowers the temperature, and when temperature drops to setting when following, fan stops automatically.In order to show the duty of instrument, state news Chinese percussion instrument (16) can be set.When instrument is operated in different conditions (as constant temperature, dress sample, intensification, cooling etc.), send different news sound, to remind the operator, increase work efficiency.Expansion mouth that 8 D/A, 2KRAM, 4KEPROM, the 8155IC that controlled by single chip microprocessor plate (1) can be made up of 3 1/2 A/D, the 0832IC that 8031CPU, MC14433 form form and 8 figure place sign indicating number displays (14) (dynamic scanning type) constitute.Drawing printer (15) can adopt PP40 or other similar drawing printer.Impedance conversion and multiple tracks amplifier (4) can be made of ICOP07; Sampling holder (5) can be made of IC339; Multiple tracks switch (6) can be made of IC4051; Temperature-adjusting circuit (12) is by photoelectric isolating circuit and amplifier combination; Temperature detect switch (TDS) (7) is realized by controllable silicon; Fan governor (13) and state news Chinese percussion instruments (16) all can be by computer hardware and software in conjunction with realizations.Room temperature and furnace temperature sensor can adopt platinum resistance, copper resistance or other galvanic couple, and it is carried out getting final product after the linearity correction.(2) for the hot platen of the hot platform of bar shaped; (3) be the cold junction electrode, it is that 4～6 millimeters hollow aluminium alloy pipe is made by diameter.Temperature tracking control unit (10) can adopt circuit as shown in Figure 2 to realize that furnace temperature signal HT and room temperature signal RT be input subtraction circuit A simultaneously ₁, output voltage is that △ T=HT-RT △ T signal is by resistance R ₄Enter A ₂The comparer of forming, another road signal is that 8031 controlled by single chip microprocessor plates pass through resistance R ₅The preset voltage of sending, the two goes to control temperature-adjusting circuit (12) and gauge tap (7) by 8031 single chip microcomputers by software then than send into controlled by single chip microprocessor plate (1) than the result.When room temperature changes or furnace temperature when affected by environment, △ T also changes thereupon, because preset voltage is constant, thereby comparer A ₂The variation that the signal of output just can compensate HT or RT delicately to be taken place makes the temperature difference keep constant.

Claims (7)

1, a kind of intelligent multiple tracks mineral thermoelectric instrument that adopts controlled by single chip microprocessor is made up of main frame, sample warm table and drawing printer, it is characterized in that main frame adopts controlled by single chip microprocessor, and the sample warm table is the hot platform of multi-electrode, adopts 5～8 cold junction electrodes usually.

2, multiple tracks mineral thermoelectric instrument according to claim 1 is characterized in that the hot platform of multi-electrode is the hot platform of bar shaped.

3, multiple tracks mineral thermoelectric instrument according to claim 1 and 2 is characterized in that the hot platform of multi-electrode adopts the bar shaped horizontal type structure, is made of the hot platen that can hold 5～8 electrodes, cold junction electrode, well heater, temperature detect switch (TDS) and cooling fan.

4, multiple tracks mineral thermoelectric instrument according to claim 3 is characterized in that each cold junction gaps between electrodes is 4～7 millimeters.

5, multiple tracks mineral thermoelectric instrument according to claim 1 and 2 is characterized in that the cold junction electrode adopts the hollow aluminium alloy pipe to make, and the cold junction temperature sensor is placed in the hollow aluminium alloy pipe, and it is closely contacted with electrode.

6, multiple tracks mineral thermoelectric instrument according to claim 1 and 2 is characterized in that being provided with in the main frame the constant control device of the temperature difference, is made of cold junction temperature sensor amplifier, hot-side temperature sensor amplifier and temperature difference autotracking unit.

7, multiple tracks mineral thermoelectric instrument according to claim 1 and 2 is characterized in that being provided with in the main frame state news Chinese percussion instrument.