GB2205395A - Mössbauer spectrometer - Google Patents
Mössbauer spectrometer Download PDFInfo
- Publication number
- GB2205395A GB2205395A GB08712911A GB8712911A GB2205395A GB 2205395 A GB2205395 A GB 2205395A GB 08712911 A GB08712911 A GB 08712911A GB 8712911 A GB8712911 A GB 8712911A GB 2205395 A GB2205395 A GB 2205395A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- input
- signal
- analyser
- vibrator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/095—Gamma-ray resonance absorption, e.g. using the Mössbauer effect
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Description
A 1 ' - -1- 2205395 OSSBAUER SPECTROMETER The present invention relates to
precision appara tus employed in nuclear physics, and more particularly it relates to Ossbauer spectrometers.
The invention can be utilized in applied physics,, chemistry, geology, metallurgy and other fields of science and tecbnology for analysis of substances wheXe resonance absorption of gamma-ray quanta takes place.
There is known a Mdssbauer'spectrometer CDMpri- Sing 8 Source of gamma rays, mounted on a vibrator, and, successively arranged along the path of gamma rays, an absorber of gamma radiation and a deteOtDr Of gamma radiation having its output connected to the input of an amplification and amplitude selection unit of which the output is electrically connected with the input of a multichannel analyser whose address signal input is connected to the address Signal DUtpUt of a master oscillator having its triggering signal output electrically connected with the triggering signal in- put of the multichannel analyser and its reference signal output connected to the input of an error signal amplifier of which the other input is CD12M6Cted to a transmitter of the vibrator speed and the output is connected through a power amplifier to the master coil of the vibrator (PribDry i tekhnika eksperiments, No. 5, 1967 /Moscovij T.Tomov et al. I'Messbauerovski spektromet.r", pp. 133-142).
U With a Ossbauer spectrometer having the abovedescribed structure, the performance of its vibrator is affected by various acoustic and seismic influences and electromagnetic interferences, so that the experimentPrDduced shape of the line of the M'Dssbauer spectrum being registered is prone to distortion, being as it is a function of a Doppler shift of the ener.gy of resonance gamma-ray quantas and the shape of the line Of the T.'IDssbauer spectrum bein7 not g registered would 1() be restored or recovered even if the external disturbance ceases to exist.
There is further known a M6ssbauer Spectrometer comprising a source of gamma rays, mounted On a vibrato.r, and, successively arranged along the path of gamma rays, an absorber of gamma radiation and a detectox of gamma radiation, having its output connected to the input of an amplification and amplitude selection unit of which the output is electrically Connected with the input of a multichannel analyser electric- ally connected with a switching unit and having. its address signal input connected with the address signal output of a master oscillator whose triggering signal output is connected electrically with the triggering signal input of the multichannel analyser and Whose re- ference signal OUtpUt is Connected to the input of an error signal amplifier having its other input connected with the transmitter of the vibrator speed and b 1 G\ -3having its output connected with an error signal analyser electrically connected with the switching unit and also connected through a power amplifier with the master coil of the vibrator (Journal "Scientific Instruments"s v-3, 1970, O.A.Kajaste et al. "Error signal analyser for MOssbauer drives", PP934-936).
In this Mo-ssbauer spectrometer the electric connection of the input of the multichannel analyser with the output of the amplification and amplitude selection unit is direct, and the electric connection of the trig-.,gering signal output of the master generator with the corresp,onding input of the multichannel analyser is through the switching unit, the electric connecteion of the output of the error signal analyser with the s-vvit- 15ching unit being also direct.
Thus, a reduced effect of the influence of external disturbances on the accuracy of registration of the M6ssbauer spectrum is attained by inhibiting the sending of a triggering signal to the multichannel analyser when the error signal representing a difference between the reference signal and the signal of the vibrator.speed transmitter, representative of an instantaneous value of the velocity of the vibrator rodq exceeds a predetermined limit.
However, the stochastic character of the effect of external disturbances on the vibrator results in a situation where an event of the error signal exceeding G the predetermined threshold value is equally probable aver the entire time-related cycle of scanning the tdossbauer spectrum. Hence, within the interval between the appearance of this event and the beginning of the next scanning cycle a distorted spectrum would be registered, as the Doppler shift of the energy of resonance radiation would not correspond to the consecutive number of the channel of the multichannel analyser where pulses coming from the detector are registered. Moreover, if the error signal falls below the predetermined threshold value until the next scanning cycle commences, the very fact of excess would pass unnoticed. The appearance of an event of excess over the cycle time of scanning the I'AO'ssbauer spectrum being uniformly probable, and the ratio of the duration of a triggering signal to the cycle time being about 10-5:1, the probability P of registration of the NIOssbauer spectrum with a preset accuracy in the spectrometer being discussed over N cycles of scanning the MOssbauer spectrum equals p = 10-5N I and tends to zero with a growth of the number of scanning cycles where an event of the error signal exceeding the threshold value occurs.
The above considerations lead to a conclusion of an inadequate accuracy of measuring the M6ssbauer spectrum in an environment where seismic, acoustic and/or electromagnetic distrubances take place.
It is an object of the present invention to enhance 1 C) the accuracy of measuring the MOssbauer spectrum by inhibiting the accumulation of the spectrum over the time of non-correspondence between the Doppler shift of the energy of the source and the channel No. in the multichannel analyser.
This object is attained in a MLO'ssbauer sPectrometer comprising a source of gamma rays, mounted on a vibrator, and, successively arranged along the path of gamma rays, an absorber of gamma radiation and a detector of gamma radiation, having its output connected to the input of an amplification and amplitude selection unit whose output is electrically connected to the input of a mulVichannel analyser electrically connected with a switching unit and having its address signal input connected with the address signal output of a master oscillator whose triggering signal output is connected electrically with the triggering signal input of the multichannel analyser and whose reference signal output is connected to the input of an error signal amplifier having its other input connected with the transmitter of the vibrator speed and having its output connected with an error signal analyser electrically connected with the switching unit and also connected through a power amplifier with the master coil of the vibrator, which spectometer, in accordance with the present invention, further comprises a monostable multivibrator wibh an output signal duration being a multiple of the period of the reference signal of the master oscillator, having its input connected with the output J of the error signal analyser, the electric connection of the output of the amplification and amplitude selection unit with the input of the multichannel analyser including the switching unit, the output of the mono- stable multivibrator being connected with the control input of the switching unit, in which way the. electric connection of the error signal analyser with the switching unit is established.
With a M6ssbauer spectrometer thus constructed, errors in measuring the variables of the M'Ossbauer spectrum are substantially eliminated. In this spectrometer inf ormation would not be sent to the multichannel analyser from the very moment the error signal exceeds 0 the predetermined threshold and the accumulation of spectrometric information is interrupted till the end af the working period or cycle, and, upon the error signal falling to an absolute value below the predeter-' mined threshold value, -the sending-of information would be restored at the very period where the fact had taken place, at the moment and at the accumulation channel where the feeding in of information has been interrupted.
This provides for ensuring the required accuracy of measurements in an environment where seismic, acoustic and/or electromagnetic disturbances take place.
The said and other objects of the present invention will be better understood from the following description of its embodiment, with reference being made to the accompanying drawings, wherein:
C 0 FIG. I is a block unit diagram of a IAO'ssbauer spectrometer embodying the invention; PIGS 2 a,b,o,d,e plot the values of voltage U (Y-axis, bb) against time 'It" (X-axisl bc) of triggering signal, address signals, threshold voltages, error signall signal generated by the signal error analyser and signal generated by the monostable multivibrator of the spectromter illustrated schematically in FIG. I.
The MOssbauer spectrometer embodying the invention comprises a source 1 (FIG. 1) of gamma rays, mounted on a vibrator 2. and, successively arranged along the path A of gamma rays, an absorber 3 of - amma radiation and a gam..a radiation detector 4 having its output connected to an amplification and amplitude selection unit 5- The output of the amplification and amplitude selec- tion. unit is connected to the input 6 of a switching unit 7 having its output connected to the input 8 of a multichannel analyser 9. The address signal input 10 of the multichannel analyser 9 is connected to the address signal output 11 of a master oscillator 12 whose triggering signal output 13 is connected to the triggering signal input 14 of the multichannel analyser 9. The reference signal output of the master oscillator 12 is connected to the input 15 of an error signal amplifier 16 whose other input 17 is connected to a transmitter 18 of the speed of the vibrator 2 and whose output is connected to an error signal analyser 19 and, through a power amplifier 20, to the master coil 21 of the vibrator 2.
1 -i The output of the error signal analyser 19 is connected to the input of a multistable multivibrator or univibrator 22 having its output connected to the control input of the switching unit 7.
The operating principle of the MOssbauer spectrometer embodying the invention is as follows. - Pulses coming from the gamma radiation detector 4 (Fig. 1) are amplified and subjected to amplitude selection in the unit 5 which sends thus processed pulses IU through the switching unit 7 to the multichannel analy- ser 9 operating in a successive recalculation mode and being synchronized by triggering pulses (FIG. 2a) coming from the master oscillator 12 at intervals T, the address of an accumulation channel in the multichannel analyser 9 being clock-timed by address signals (FIG. 2b) of the C) master oscillator 12. The latter also generates a reference signal governing the modulation law, while the error signal amplifier 16 calculates a difference "x" (FIG. 2c) between the reference signal coming to its input 15 and the speed signal coming to its input.1"'? from the transmitter 18 of the speed of the vibrator 2.
The error signal analyzer 19 compares the differential signal "x" with the predetermined threshold values +U 1 and -U, (FIG& 2c) representing the required accuracy of accumulation of the MOssbauer spectrum. When the differential signal exceeds the threshold value, as it can be seen in FIG. 2c, at a moment t. corresponding to -1 1 -i the accumulation channel a. (FIG. 2b), the error signal analyser 19 feeds out a signal U2 (FIG. 2d) in accordance with a logical function:
0 if X< 1 Ull U 1 if X U The monostable multivibrator 22 feeds out a signal U 3 of a duration T equalling therecurrence period of the triggering signals (FIG. 2e). The leading edges of the signals U 2 and U 3 coinc ide in time. The signal U 3 is sent from the output of the monostable multivibrator 22 to the control input 23 of the switching unit 7, for the latter to break the electric connection between _the multicharinel analyser 9 and the amplification and amplitude selection unit 5, so that information ceases to flow into the multichannel analyser 9 from the moment t. when the differential signal exceeds the threshold value at the a. accumulation channel (FIG.2c), until the time tn+T corresponding to the ai accumulation channel during the next accumulation cycle, provided th,-,- it by this time the absolute value of the error (differential) signal has fallen below the threshold value. In this way uniform density of information distribution is maintained both within the chanael and within the entire MOssbauer spectrum of the multichannel analyser 9.
Given below are some data obtained by measurement conducted in a MUsbauer spectrometer constructed in accordance with the invention.
In an environment of existence of external disturbances, seismic disturbances in particular, the MUssbauer spectrum was measured with the following preset values of tolerable error. per cent of the speed range: 0.01; 0.05; 0.1; 0.59 and also with the monostable multivibrator 22 (FIG. 1) disconnected. The value of the width F of an expericriental line in the MUssbauer spectrum was measured. The source of seismic disturbances used was a motor whose shaft carried a weight misbalanced with respect to the axis of rotation. With a constant angular speed of the motor, the value of the speed-related error 1 (t) for the i-th channel of the multichannel analyser 9 can be described by an expression:
Oi (t) = 0. 5 sin (100 -/C t + O) 06 (0.2), where Z is the radian measure of an angle; t is current time; O is the initial time of signal variation.
The abosrbing sample 3 was potassium ferrocyanide K4Fe(ON)63H 20 whose absorption spectrum is represented 2U by a single line. The speed range for spectrum scanning was:h 3.0 mm/s, and the effect value was 267o. The data obtained by the measurements are summarized in the Table below.
Table
No. Error threshold value, Line width in spectrum, F 9 mm/ S 1 0.00 0.364 1 0.002 1 0.01 0.05 0.1 0.5 c). 366!' c). 002 3 4 6 - 0.366 0.002 0.367 0.002 0.368 0.002 0.68 0.03 Line No. 1 in the Table corresponds to the known table value of the line width for ferrocyanideg and No. 6 line pertains to the data obtained with the monostable multivibrator 22 disconnected, when information was flowing into the multichannel analyser 9 through the switching unit 7 at any level of disturbances.
The disclosed MOssbauer spectrometer is operable for obtaining MSssbauer spectra with a preset accuracy unaj fected by acoustic, seismic and other external influences, 10 with the tiza- otherwise required for repeating an experiment being saved.
1 i
Claims (2)
1. A MO'ssbauer spectrometer comprising a source of gamma rays,, mounted on a vibrator, arid, successively arranged along the path of gamma rays, a gamma radiation absorber and a gamma radiation detector having its output connected to the input of an amplification. and amplitude selection unit; a switching unit having its output connected to the input of a multichannel analyser whose address signal i4put is connected with the address sig- nal output of a master oscillator of which the triggering signal,output is connected with the triggering signal input of the multichannel analyser and the reference signal output is connected with the input of a signal error amplifier whose other input is connected with a vibrator speed transmitter and whose output is connected with an error signal analyser and, through a power amplifier, with the master coil of the vibrator; a monostable multivibrator with an output signal duration being a multiple of the reference signal period of the master oscillator, the input of the monostable multivibrator being connected with the output of the error signal analyser and its output being connected with the control input of the switching unit whose other input is connected to the output of the amplification and amplitude selection unit.
2. A lAO"ssbauer spectrometer substantially as hereintofore described with reference to the appended drawings.
Published 1988 at The Patent Office, Itate House, 6671 Figh Holborn. London WCIR 4TP_ Fwther copies maybe obtained from The Patent Office, Sales Branch, St Mary Cray, Orpington, Kent B111.15 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent. Con. Ii87.
1
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08712911A GB2205395A (en) | 1987-06-02 | 1987-06-02 | Mössbauer spectrometer |
| DE19873719348 DE3719348A1 (en) | 1987-06-02 | 1987-06-10 | MOESSBAUER SPECTROMETER |
| FR8708228A FR2616539B1 (en) | 1987-06-02 | 1987-06-12 | MOSSBAUER SPECTROMETER |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08712911A GB2205395A (en) | 1987-06-02 | 1987-06-02 | Mössbauer spectrometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8712911D0 GB8712911D0 (en) | 1987-07-08 |
| GB2205395A true GB2205395A (en) | 1988-12-07 |
Family
ID=10618274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08712911A Withdrawn GB2205395A (en) | 1987-06-02 | 1987-06-02 | Mössbauer spectrometer |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3719348A1 (en) |
| FR (1) | FR2616539B1 (en) |
| GB (1) | GB2205395A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2156517A1 (en) * | 1998-12-29 | 2001-06-16 | Consejo Superior Investigacion | Micro-Mossbover miniaturized spectrometer comprises gamma ray source with piezoelectric oscillator and solid state detector reduce bulk |
| WO2002055972A1 (en) * | 2001-01-15 | 2002-07-18 | Consejo Superior De Investigaciones Científicas | Mossbauer spectrometer with piezo transducer technology and solid state detectors |
| CZ302439B6 (en) * | 2005-06-29 | 2011-05-18 | Univerzita Palackého | Mossbauer spectrometer |
| RU227589U1 (en) * | 2023-10-30 | 2024-07-25 | Михаил Вячеславович Ушаков | MÖSSBAUER HIGH STABILITY FUNCTIONAL GENERATOR |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3348454C2 (en) * | 1983-07-28 | 1994-03-17 | Hydrocarbon Research Inc | Measuring device and measuring method for measuring the ash concentration in a flowing liquid |
| DE10015385C2 (en) * | 2000-03-24 | 2002-10-02 | Bam Bundesanstalt Matforschung | Process for carrying out Mössbauer spectroscopy and device for carrying it out |
-
1987
- 1987-06-02 GB GB08712911A patent/GB2205395A/en not_active Withdrawn
- 1987-06-10 DE DE19873719348 patent/DE3719348A1/en not_active Withdrawn
- 1987-06-12 FR FR8708228A patent/FR2616539B1/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2156517A1 (en) * | 1998-12-29 | 2001-06-16 | Consejo Superior Investigacion | Micro-Mossbover miniaturized spectrometer comprises gamma ray source with piezoelectric oscillator and solid state detector reduce bulk |
| WO2002055972A1 (en) * | 2001-01-15 | 2002-07-18 | Consejo Superior De Investigaciones Científicas | Mossbauer spectrometer with piezo transducer technology and solid state detectors |
| ES2170722A1 (en) * | 2001-01-15 | 2002-08-01 | Consejo Superior Investigacion | Mossbauer spectrometer with piezo transducer technology and solid state detectors |
| CZ302439B6 (en) * | 2005-06-29 | 2011-05-18 | Univerzita Palackého | Mossbauer spectrometer |
| RU227589U1 (en) * | 2023-10-30 | 2024-07-25 | Михаил Вячеславович Ушаков | MÖSSBAUER HIGH STABILITY FUNCTIONAL GENERATOR |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2616539B1 (en) | 1989-10-27 |
| FR2616539A1 (en) | 1988-12-16 |
| DE3719348A1 (en) | 1988-12-22 |
| GB8712911D0 (en) | 1987-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3976878A (en) | Natural gamma ray spectrum analysis technique | |
| EP0072418A1 (en) | Computer-based system for acquisition of nuclear well log data | |
| US2841713A (en) | Radiation type flowmeter | |
| US3579127A (en) | Apparatus for monitoring pulses | |
| US3688106A (en) | Measuring the density, velocity and mass flow of gases | |
| JPS6445050A (en) | Mass spectrometer for secondary ion | |
| GB2205395A (en) | Mössbauer spectrometer | |
| US4048844A (en) | Electric system of meter for measurements of density of mixtures conveyed in a pipeline | |
| CA1065500A (en) | Method and apparatus for measuring the thermal neutron absorption rate in earth formations | |
| US2638273A (en) | Dual-channel counting rate meter | |
| US2647323A (en) | Elevation meter | |
| WO1995004285A1 (en) | Dynamic air gap detector | |
| GB2189606A (en) | A method of operating a mass spectrometer and a mass spectrometer for carrying out the method | |
| US4514637A (en) | Atomic mass measurement system | |
| De Bruin et al. | A simple dead-time stabilizer for gamma-ray spectrometers | |
| US3402294A (en) | Radiation measuring system and method | |
| US3939343A (en) | Pulsed neutron logging system for inelastic scattering gamma rays with gain compensation | |
| EP0090465A1 (en) | X-ray analysis apparatus with pulse amplitude shift correction | |
| Saxe et al. | The detection of boiling in nuclear reactors | |
| GB1422721A (en) | Method of and apparatus for determining counting efficiency in liquid scintillation counting | |
| Cooper et al. | Proton-Proton Scattering Near the Interference Minimum | |
| SU505976A1 (en) | Method of compensating for instability of radiation detector | |
| GB2210159A (en) | Mössbauer spectrometer | |
| SU779960A1 (en) | Device for stabilizing spectrometer energy scale | |
| US3719078A (en) | Linear output boat speedometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |