CN2044069U - Semiconductor luminotron double wavelength photometric absorption meterr - Google Patents

Abstract

The utility model relates to a semiconductor luminotron double wavelength photometric absorption meter. The light with different wave lengths is emitted from two semiconductor LED with different wave lengths or one semiconductor bicolor luminous tube. The light is received by a semiconductor detector and is converted into an electrical signal after passing through the solution of the measured substance. The utility model has the advantages of long service life, small size, low cost and convenient, sensitive and accurate testing analysis.

Description

Semiconductor luminotron double wavelength photometric absorption meterr

The utility model is a kind of light that adopts semiconductor luminotron alternately to launch different wave length, after material absorbing, change by the detecting device receiving optical signals, carry out the luminosity absorptiometer of Measurement and analysis, belong to the analytical instrument of utilizing optical instrument test or analysis of material composition.

Luminosity absorptiometry analyser is that the light of certain wavelength is sent into absorbing material, is tested by detector measurement luminosity variable quantity then or analysis of material composition.The employing semiconductor light-emitting-diode that this analysing and measuring instrument has is as single wavelength light source.What deliver as " optical communication " (Outics Letters, Vol.8, No.1, p54-56,1983) is that 560 millimeters light emitting diode and perchlorate made with emission wavelength, in order to measure the reversible light guide sensor of ammonia; " analytical chemistry journal " (Anal.Chim.Acta Vol.177, what p121-128) deliver is that 820 millimicrons light emitting diode is made as light source with emission wavelength, in order to the optical fiber absorption cell of copper ion concentration in the monitoring electroplate liquid.Yet,, disturb greatly the deficiency that sensitivity is low so exist because the employing of single wavelength measurement analyser is single wavelength light test or analysis of material composition.Thus, dual wavelength luminosity absorptiometer has caused attention in recent years.In 630 pages of " analytical chemistry " 12 7 phases of volume according to the ripple lattice---Beer law has been reported a kind of method and apparatus that dual wavelength light is measured of using.The dual wavelength analysing and measuring instrument mainly is a light of using two bundle different wave lengths, send into measured matter, and the measuring beam signal difference is tested or analysis of material composition then.Its light source requirements emission spectrum is level and smooth, and wavelength coverage is wide and light intensity is big.Usually adopt tungsten lamp, halogen tungsten lamp or xenon lamp.During analysis to measure, a kind of is being divided into two bundles through the light beam behind the sample with splitting the light device, select the light of different wave length again with two interference filters, receive by detecting device (light activated elements such as photoresistance, photoelectric cell, photoelectric tube or photomultiplier), draw signal difference between different wavelengths of light with subtracter, in view of the above test or analysis of material composition; Another kind is the dual wavelength light that mechanically optical modulation is struck a bargain and to replace with chopper, behind measured matter, by same detecting device synchronous detection light signal, draws the signal difference of different wavelengths of light, test or analysis of material composition through subtracter.Dual wavelength luminosity absorptiometer is little with its error, highly sensitive, and is applied widely and be used widely day by day.Yet the present dual wavelength measuring and analysing meter part that also comes with some shortcomings is an incandescent lamp as the light source that adopts, and power is big, and heat radiation is strong, is difficult for heat radiation; Acknowledge(ment) signal and Instrument structure be more complicated etc. also.In order to overcome the shortcoming that this dual wavelength luminosity absorptiometer exists, the utility model improves and a kind of semiconductor luminotron is provided is the dual-wavelength photometer of light source, thereby further simplified the structure of instrument, dwindled the instrument volume, improved the serviceable life of instrument.

The purpose of this utility model is to adopt the semiconductor light-emitting-diode or a double color luminotron (Chinese patent CN86200588U) of two selected wavelength to make light source, interleaved power, emission light beam.Alternately light beam is detected by a light activated element through behind the tested absorbing material, input amplifier, and rectification is then according to the change analysis of material of light signal.Thereby simplified the structure of light absorption analysis instrument, improved the reliability and the accuracy of instrument.

The utility model semiconductor luminotron dual wavelength luminosity absorptiometer is made of semiconductor light-emitting-diode or double color luminotron, lens, measured matter, reflective mirror, light-sensitive detector, circuit of light sources, testing circuit, demonstration or indicator.Two luminous dies of two semiconductor light-emitting-diodes or a double-colored semiconductor luminotron are by the light source power interleaved power, constantly alternately launch two by turns and restraint light beams of different wavelengths, and be adjusted at by reflective mirror or lens and become " directional light " on the same light path.Adjusted dual wavelength " directional light " is received by same detecting device through behind the measured matter.Like this, what detecting device received is the signal that a succession of mutual Title connects, and promptly behind the dual wavelength light process measured matter of emission, when the light signal that detecting device receives equated, detecting device output was similar to direct current signal, and display indicator is motionless.But when the dual wavelength light signal that receives when detecting device was unequal, then testing circuit was exported on the direct current signal that mutual Title connects and is superimposed with pulse signal.After in fact this pulse signal is exactly the tested absorbing material of two bundle light processes, the different wave length luminosity signal difference of generation.After being superimposed with the current signal electricity consumption vessel isolation of pulse signal on this direct current, just output pulse signal.After rectification, be input in indication or record or the display.Utilize this light signal difference just can judge the composition of titration end-point or analysis to measure measured material.Report to the police or the also directly variation of control material component of automatic controls if install.The utility model luminosity absorptiometer is used for titrimetry, earlier according to the sensitiveest absorbing wavelength of the indicator that is adopted, selects the semiconductor luminotron of different wave length to do light source.Then, volumetric soiutions is placed between light source and the detecting device (as photodiode, phototriode or photoelectric cell), perhaps semiconductor luminotron light source and detector are installed in the photoconductive tube, and place a reflective mirror, immerse solution in the cell bottom that connects photoconductive tube.After placing light source and pick-up probe like this, make the dual wavelength light beam,, just can test or analysis of material again by the detector receiving optical signals by detected solution.Before the titrimetry, regulate earlier the shunt resistance in parallel with semiconductor luminotron, make the indication behind reception, amplification, the rectification circuit or the indicated value of demonstration or register instrument be minimum, promptly the initialize signal of dual wavelength light is the most approaching.After titrimetry begins, special in reaching the terminal point hop during stage, because the light absorption of indicator changes in the tested absorbing material, detection receives, signal after rectification is amplified is corresponding also to change, and promptly the light signal difference causes that electric signal official post indication or demonstration or register instrument express titration and reached terminal point.Must it should be noted that, when using the utility model to carry out titrimetry, because the wayward unanimity of factors such as concentration of indicator of each titration, so need before titrimetry, to adjust earlier the shunt resistance of semiconductor luminotron, so that the initial optical signal of dual wavelength light is the most approaching, be that indicating instrument is failure to actuate, thereby make titrimetry more accurate.In addition, the utility model is used for material composition analysis and colorimetric analysis, and method is basic identical, and has same advantage.

The utility model has the advantages that, adopt the light source of semiconductor light-emitting-diode, simplified the structure of light source greatly, dwindled the volume of the Lights section, and can not consider the influence of the factor of dispelling the heat as dual wavelength luminosity absorptiometer; In addition,, adopt semiconductor luminotron to make light source, can satisfy general molecule absorption requirement, both saved monochrome elements (as optical filter etc.), simplified the structure of instrument again because the optical wavelength range of semiconductor luminotron emission is narrow.Adopt a light activated element to make detector, not only reliable but also make instrument more simple, cost reduces.Therefore, this is a kind of highly sensitive, and volume is little, widely used analysis to measure instrument.

Description of drawings:

Fig. 1 is a main frame outside drawing of the present utility model.Wherein, the 1st, casing; The 2nd, microampere meter; The 3rd, power lead; The 4th, the zero-regulator resistor knob; The 5th, power switch; The 6th, input socket.

Fig. 2 is that measured material solution places the structural map between light source and the detector.Wherein, the 7th, buret; The 8th, hold the beaker of measured material solution; The 9th, survey photoelectric cell; The 10th, the prime amplifier of testing circuit; The 11st, back up pad; The 12nd, stirrer; The 13rd, lens; 14 is two semiconductor light-emitting-diodes or a double color luminotron; The 15th, measured matter.

Fig. 3 is the proving installation structural map of photoconductive tube light source and detector.Wherein, the 16th, photoconductive tube; The 17th, solution can flow to the cell of outflow; The 18th, place the reflective mirror of cell bottom; The 19th, cable; The 20th, the slotted eye that the flow of solution influent stream goes out on the cell.

Fig. 4 is a light source power electrical schematic diagram of the present utility model.Wherein, the 21st, ring oscillator.

Fig. 5 is the testing circuit electrical schematic diagram.Wherein, the 22nd, block condenser; The 23rd, the rectification amplifying circuit; The 24th, indication or record or display.

Below in conjunction with description of drawings embodiment of the present utility model.

Embodiment 1

Measured material solution 15 places titrimetry device such as the Fig. 2 between light source 14 and the detector 9.The transparent beaker 8 that fills measured material solution 15 is placed on the back up pad 11 on the below stirrer 12 of buret 7, then two semiconductor light-emitting-diodes or a double color luminotron light source 14 being installed and surveying the outside that photoelectric cell 9 relatively is positioned over transparent beaker 8.Luminotron is connected with the main frame of lead with the luminosity absorptiometer with detector.The light source power of installing by Fig. 4 in the main frame and the testing circuit of installing by Fig. 5 are connected the prime amplifier 10 of luminotron 14 and detector 9 respectively; Microampere ammeter 2 on the main frame is connected with the testing circuit output terminal.Wherein, being embodied as of the Lights section, be installed on after two semiconductor luminotrons or a double color luminotron light source 14 are welded on the stem on the support in the shell, the shell front is equipped with and adjusts light is the lens 13 of same light path " directional light ".Alignment light source was installed in to receive and surveys in the shell after detection photoelectric cell 9 was welded on the base.During titrimetry, energized, two semiconductor luminotrons of different wave length or double color luminotron 14 are by the light source power interleaved power that is installed in the main frame, constantly alternately launch two bundle light beams of different wavelengths by turns, the light scioptics of launching 13 are adjusted into " directional light ", inject measured material solution 15, and are received by the detection photoelectric cell 9 on opposite, become electric signal input prime amplifier 10, the testing circuit of pressing Fig. 5 installation in the amplifying signal input main frame.When titration began, because detected solution 15 colors are certain, and light absorption can be adjusted to closely by being connected in parallel on zero-regulator resistor knob 4 on the semiconductor luminotron 14, i.e. the output of the light signal that detects of detector 9 is almost equal, shows microampere ammeter 2 indicated value minimums.After titration was carried out, along with the continuous adding of titrant, detected solution 15 colors changed, especially in the titration end-point hop stage, two kinds of wavelength change in optical signal that detector 9 detects change the electric signal of output, thereby make microampere ammeter 2 indicate titration end-point.

Embodiment 2

Semiconductor luminotron light source 14 and detector 9 usefulness location rubber dog 21 are installed in parallel in the photoconductive tube 16.One end of photoconductive tube 16 is with glass bar or lens 20 and rubber washer sealing, and the other end inserts lead, and luminotron 14 is connected with main frame light source power and testing circuit with prime amplifier 10 with detector 9.During titrimetry, place the cell 17 of reflective mirror 18 in a termination upper bottom portion of the light source of photoconductive tube 16 and detector, immerse then in the detected solution 15 of beaker 8, the solution in the beaker can flow to outflow by the slotted eye on the cell 17 20.After the luminosity absorptiometer energized, luminotron 14 sends the light of two bundle different wave lengths, by detected solution 15, and is reflected into detector 9 by the reflective mirror 18 of cell 17 bottoms.The same with embodiment, when titration begins, the zero-regulator resistor device knob 4 of elder generation's adjusting and luminotron 14 parallel connections, the light signal that detector 9 is received is approaching, microampere ammeter 2 indicated value minimums.After the titration, especially in the titration end-point hop stage, microampere ammeter 2 indicates signal to be changed, and shows that titration reaches terminal point.

Use the utility model dual-wavelength photometer to carry out material analysis and colorimetric analysis, method with as Upper embodiment. Therefore, this is a kind of of many uses, and is reliable, the chemical analysis instrument of long service life.

Claims (2)

1, a kind of dual wavelength luminosity absorptiometer, comprise measured matter solution 15, titrant, testing circuit, demonstration or record or indicator 24, light absorption meter host housing 1, power lead 3, it is characterized in that having the semiconductor light-emitting-diode of two different wave lengths that constitute light source or semiconductor double color luminotron 14, interleaved power light source power, adjust light beam and survey the semiconductor detector 9 that receives through the detected solution light signal for the reflective mirror of " directional light " or lens and one.

2, semiconductor luminotron dual wavelength luminosity absorptiometer according to claim 1 is characterized in that having in the light source power RC annular oscillating impulse generator that produces interleaved power.

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