CN2280289Y - Weak light investigating instrument - Google Patents

Abstract

The utility model relates to a weak light measuring instrument, which comprises a sample chamber, a photodetector, a shutter, an interlocking mechanism, a data acquisition computer interface, a microcomputer, etc., wherein, the sample chamber is installed above the instrument; the shutter and the interlocking mechanism are installed on one side of the sample chamber; the photodetector is installed below the sample chamber; the measuring instrument is connected with the microcomputer through the data acquisition computer interface.

Description

The Weak-luminescence measuring instrument

The utility model Weak-luminescence measuring instrument belongs to the electromechanical integration instrument, is meant especially to be used for the measuring instrument that biological superweak luminescence is analyzed.

At present, the domestic and international analogous instrument that uses, name is called " Luminesence Meter ", adopt miniature photomultiplier more, sensitivity is lower, and the sample chamber adopts the test-tube type volume little, can only measure the sample below several milliliters.Simple in structure because of it again, can not satisfy the measurement of large sample, and existing measuring instrument all there is not safety guard, so be easy to cause burning of photomultiplier.

The purpose of the utility model Weak-luminescence measuring instrument is, overcomes the shortcoming of above-mentioned prior art, and a kind of sample chamber with large volume is provided, and can measure the sample of large volume.

The another purpose of the utility model Weak-luminescence measuring instrument is to have safety guard, can protect the serviceable life of photomultiplier effectively.

The feature of the utility model Weak-luminescence measuring instrument is, comprise parts such as crystal sample chamber, photo-detector, shutter and interlocking gear, data acquisition microcomputer interface, microcomputer, wherein the sample chamber is installed in the top of instrument, side in the sample chamber is equipped with shutter and interlocking gear, photo-detector is equipped with in bottom in the sample chamber, and complete machine is connected with microcomputer by the data acquisition microcomputer interface; Said shutter and interlocking gear comprise, be installed in the reductor of back up pad one end bottom, cam is installed on the reductor, connect and pass back up pad with back up pad major axis is installed, the center fixed of back up pad and sample chamber has a shutter disk at the middle part of major axis, be fixed with an interlock head in the upper end of major axis, volute spring be housed in the bottom of major axis; Around photomultiplier, a cooling system is arranged, comprise, be installed in photomultiplier vacuum chamber on every side, be wound with cooling tube in the vacuum chamber mid-game.

Below in conjunction with accompanying drawing the utility model is described further, wherein:

Fig. 1 is a structured flowchart of the present utility model;

Fig. 2 is the structural representation of the utility model probe;

Fig. 3 is the synoptic diagram of shutter disk and cam among Fig. 2;

Fig. 4 is the synoptic diagram of stops and interlock head among Fig. 2;

Fig. 5 is the position view of shutter.

See also Fig. 1 earlier, the utility model comprises, probe and microcomputer, and wherein, microcomputer and probe are by data acquisition microcomputer interface be connected (this is prior art, and appearance is not given unnecessary details).See also Fig. 2 again, probe is by sample chamber 1, shutter and interlocking gear 2, cooling system 3 and photo-detector 4 are formed, wherein, the sample chamber is positioned at the top of instrument, comprise sample chamber body 104 and the loam cake 102 that covers on sample chamber body 104,1 of sample chamber is buckled on the base plate 107 also affixed with it, one back up pad 108 is arranged below on base plate 107, the periphery of base plate 107 and back up pad 108 is affixed, it is a slit that one side and centre are wherein arranged, so that shutter disk 202 is ccontaining, on sample chamber body 104 1 side outer walls, a well 103 is arranged, all have quartz window 405 and quartz window 404 on base plate 107 and the back up pad 108, the sample light in the sample chamber 1 can enter into photo-detector 4 by this window, and photomultiplier 407 is installed in the centre of photo-detector 4.

Shutter and interlocking gear 2 are by the stops 105 that is installed in loam cake 102 1 sides, interlock 201, and back-up block 106, major axis 203, shutter disk 202, cam 204, driving lever 206 and reducing motor 207 are formed.Reducing motor 207 is fixed on the below of back up pad 108 1 sides, and be fixed with a cam 204 at the motor axial region, driving cam 204 when motor rotates rotates, be fixed on (as shown in Figure 3) on the major axis with cam 204 corresponding position driving levers 206, major axis 203 is arranged in back up pad 108, be installed with a shutter disk 202 (as shown in Figure 3) at the middle part of major axis 203, direction is opposite with driving lever 206, can be arranged in the slit between base plate 107 and the back up pad 108; At this moment the rotation of cam 204 can be stirred driving lever 206, drives the rotation of major axis 203 and shutter disk 202 simultaneously, at this moment, shutter disk 202 can be blocked the entering of quartz window 404 light of 1 bottom, sample chamber, and when just shutter disk 202 was closed, light can not enter detector in the sample chamber 2.Photoswitch 205 is equipped with at two ends in cam 204 motions, with guarantee shutter disk 202 arrive open the position or when closing motor shut down, side and major axis 203 corresponding stationkeeping at loam cake 102 have a stops 105 in addition, interlock 201 is fixed in the upper end of major axis 203 in the bottom of stops 105, when shutter disk 202 is in the state of unlatching, stops 105 lucky and interlock 201 locked (as a position of dotted line among Fig. 4).Loam cake 102 can't be opened, otherwise during solid line position, loam cake 102 can be opened in as Fig. 4.Because of 407 pairs of opto-electronic conversion of photomultiplier have high enlargement factor, as when the measuring samples, opening by mistake loam cake 102 can burn photomultiplier 407 too by force because of the light that bleeds, so can avoid maloperation effectively by shutter and interlocking gear 2.Its course of work is, sees also Fig. 2 to Fig. 4, and when measuring samples not, shutter disk 202 is in closed condition, and interlock 201 is solid line position in Fig. 4, does not stop stops 105 to move downward, and loam cake 102 can be opened; When measuring samples need be opened shutter disk 202, cam 204 promotes driving lever 206 motions, also can drive simultaneously interlock 201 and rotate interlock 201 is forwarded to, the dotted line position among Fig. 4 is if want to open loam cake 102 this moment, stops 105 will be moved down, but the bottom has the long end of interlock 201 to stop, and loam cake 102 can not be opened, and open shutter disk 202 as long as satisfied, just can not open loam cake 102, damage photomultiplier 407 with regard to having avoided because of maloperation like this.

See also Fig. 2 again, said photo-detector 4, the bottom that is installed in instrument by flange 406 with photo-detector be fixed on back up pad 108 below, on flange 406, also be fixed with window-frame 403 and quartz window 405, flange 406 is simultaneously fastening with vacuum chamber body 401, also have flange 402 in the rear end of vacuum chamber body 401, the centre is a photomultiplier 407.

In the wherein said vacuum chamber body 401 cooling system 3 is housed also, just be wound with cooling tube 301 in the vacuum chamber mid-game, cooling tube 301 links to each other with the refrigerating machine of outside, reaches the cooling cooling (being prior art herein) to the utility model Weak-luminescence measuring instrument.The main devices of surveying device is a photomultiplier 4, it is when no measuring samples, the count pulse number of output is called background, sample-out count is relevant with the temperature of photomultiplier, count higher at normal temperatures, if the reduction temperature, sample-out count will descend, for this reason, partly adopt cooling tube 301 to be coiled in the outer vacuum chamber of photomultiplier 407 at photo-detector, when instrument uses, by compressor fluorine Lyons meson refrigeration, in case but the detector cavity cooling, will on quartz window 405, tie water or frost, measurement can't be carried out, the vacuum chamber is vacuumized for this reason, just can avoid quartz window 405 knot water or frostings.

For measuring the instrument of Weak-luminescence with photon counting, common shutter is not enough, adopted blackout thermal treatment at this to shutter disk 202, and the strict shutter disk 202 of grasping enters the gap between base plate 107 and the back up pad 108 and the size of the degree of depth, feasiblely guaranteed that the light leak background reaches negligible level (as shown in Figure 5).

The course of work of the present utility model is, at first connect refrigeration power supply and vacuum-pump power supply after the start, treat to begin measuring samples after cryogenic temperature reaches setting value, at this moment sample is put into the sample chamber and built loam cake 102, tighten hand button 101, microcomputer starts instruction, reducing motor 207 begins to rotate, shutter is opened gradually, and when arriving the open site, photoswitch 205 sends signal, reducing motor 207 stops, photomultiplier 407 beginning count measurements, the time to be measured arrives, and counting stops, enter data processor, provide response curve figure, while reducing motor 207 backward rotation are when arriving off-position, another photoswitch 205 sends signal, reducing motor 207 stops, and can open loam cake 102, takes out sample.

Below wherein said cooling system when measurement requirement is not high, or when general Weak-luminescence measured, can adopt the measuring instrument that does not have cooling system, like this can also simplified structure and running program, and the while is also reduced the cost of whole measuring instrument.

Claims (4)

1. Weak-luminescence measuring instrument, comprise parts such as crystal sample chamber, photo-detector, shutter and interlocking gear, data acquisition microcomputer interface, microcomputer, it is characterized in that, wherein the sample chamber is fixedly mounted on the top of instrument by back up pad, side in the sample chamber also is equipped with shutter and interlocking gear by back up pad, be installed with photo-detector below sample chamber and back up pad, complete machine is connected with microcomputer by the data acquisition microcomputer interface.

2. by the described Weak-luminescence measuring instrument of claim 1, it is characterized in that, said shutter and interlocking gear comprise, be installed in the reductor of back up pad one end bottom, cam is installed on the reductor, with back up pad movingly and pass back up pad major axis is installed, the center fixed of back up pad and sample chamber has a shutter disk at the middle part of major axis, be fixed with an interlock head in the upper end of major axis, volute spring be housed in the bottom of major axis.

3. by the described Weak-luminescence measuring instrument of claim 1, it is characterized in that, a photomultiplier is installed in the wherein said photo-detector.

4. by the described Weak-luminescence measuring instrument of claim 3, it is characterized in that around photomultiplier, a cooling system being arranged, comprise, be installed in photomultiplier vacuum chamber on every side, be wound with cooling tube in the vacuum chamber mid-game.

Images