Patent EP0091692A2 successfully refreshed from Google Patents.
EP0091692A2
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EP
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Method and apparatus for measuring spectra of materials
Assignee: Kozponti Elelmiszeripari Kutato Intezet
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Filing: 1983-04-12
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Granted: —
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Expires: 2003-04-12
Abstract
Abstract The invention provides on the one hand a method for measuring the spectrum of a material, wherein a sample (10) of the material to be tested is irradiated with a radiation of required wavelengths and the spectrum signals produced by an intensity measuring unit (34) as a result of the radiation reflected or transmitted by the sample (10) are measured. According to the present invention, a zero level signal produced by the intensity measuring unit (34) in an unradiated condition is measured and the measured zero level value is stored, then one or more spectrum signal measurements are performed at at least one wavelength and the measured one or more spectrum values are stored, then the zero level signal produced by the intensity measuring unit (34) is measured again in an unradiated condition and its value is stored, then preferably said one or more spectrum signal measurements at at least one wavelength prescribed and said storage of the measured values as well as said zero level signal measurement and said storage of the measured value are repeated as many times as required, and finally the stored spectrum values are modified by correction values generated on the basis of the stored zero level values. On the other hand the invention is an apparatus for measuring the spectrum of a material comprising a controllable monochromator (1) emitting a radiation of a required wavelength onto a sample (10) of the material to be tested, an intensity measuring unit (34) provided with a sensor (11) sensitive to the radiation reflected or transmitted by the sample (10), a data processing unit (14) connected to the intensity measuring unit (34) via an analog-to-digital converter (13), and a control unit controlling the analog-to-digital converter (13) synchronously with the monochromator (1) while irradiating the sample (10) with the radiation of the required wavelength. According to the invention the control unit comprises means (17, 7, 27, 29, 21,19) to provide at least one start signal onto a control input (31) of the analog-to-digital converter (13) prior to and/or after the period of irradiating the sample (10) with the radiation of the required wavelength (Figure 1).
Inventors
- 👤 András Czabaffy
- 👤 Loránd Dr. Horváth
- 👤 Károly Dr. Kaffka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:05
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/02; G01J3/0205; G01J3/0232; G01J3/0289; G01J3/28; G01J3/42; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01N21/274
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
180 words
A method for measuring the spectrum of a material, comprising the steps of irradiating a sample of the material to be tested with a radiation of required wavelengths and measuring spectrum signals produced by an intensity measuring unit as a result of the radiation reflected or transmitted by the sample, characterized by measuring a zero level signal produced by the intensity measuring unit in an unradiated condition and storing the measured zero level value; then measuring one or more spectrum signals at at least one wavelength and storing the one or more measured spectrum values; then measuring again the zero level signal produced by the intensity measuring unit in an unradiated condition and storing the measured value; preferably said one or more spectrum signal measurements at at least one wavelength prescribed and said storage of the measured values as well as said zero level signal measurement and said storage of the measured value are repeated as many times as required; and finally modifying the stored spectrum values by correction values generated on the basis of the stored zero level values.
Claim 2
Independent Claim
180 words
A method for measuring the spectrum of a material, comprising the steps of irradiating a sample of the material to be tested with a radiation of required wavelengths and measuring spectrum signals produced by an intensity measuring unit as a result of the radiation reflected or transmitted by the sample, characterized by measuring a zero level signal produced by the intensity measuring unit in an unradiated condition and storing the measured zero level value; then measuring one or more spectrum signals at at least one wavelength and storing the one or more measured spectrum values; then measuring again the zero level signal produced by the intensity measuring unit in an unradiated condition and storing the measured value; preferably said one or more spectrum signal measurements at at least one wavelength prescribed and said storage of the measured values as well as said zero level signal measurement and said storage of the measured value are repeated as many times as required; and finally modifying the stored spectrum values by correction values generated on the basis of the stored zero level values.
Claim 3
Independent Claim
181 words
A method for measuring the spectrum of a material, comprising the steps of irradiating a sample of the material to be tested with a radiation of required wavelengths and measuring spectrum signals produced by an intensity measuring unit as a result of the radiation reflected or transmitted by the sample, wherein the intensity measuring unit is set to zero in an unradiated condition, characterized by measuring one or more spectrum signals at at least one wavelength subsequent to the zeroing of the intensity measuring unit and storing the one or more measured spectrum values; then measuring the zero level signal produced by the intensity measuring unit in an unradiated condition and storing the measured zero level value; then preferably said one or more spectrum signal measurements at at least one wavelength prescribed and said storage of the measured values as well as said zero level signal measurement and said storage of the measured value are repeated as many times as required; and finally modifying the stored spectrum values by correction values generated on the basis of the stored zero level value(s).
Claim 4
Independent Claim
181 words
A method for measuring the spectrum of a material, comprising the steps of irradiating a sample of the material to be tested with a radiation of required wavelengths and measuring spectrum signals produced by an intensity measuring unit as a result of the radiation reflected or transmitted by the sample, wherein the intensity measuring unit is set to zero in an unradiated condition, characterized by measuring one or more spectrum signals at at least one wavelength subsequent to the zeroing of the intensity measuring unit and storing the one or more measured spectrum values; then measuring the zero level signal produced by the intensity measuring unit in an unradiated condition and storing the measured zero level value; then preferably said one or more spectrum signal measurements at at least one wavelength prescribed and said storage of the measured values as well as said zero level signal measurement and said storage of the measured value are repeated as many times as required; and finally modifying the stored spectrum values by correction values generated on the basis of the stored zero level value(s).
Claim 5
Dependent Claim
49 words
The method according to claim 2, characterized in that all the operations preceding the modification of the stored spectrum values are repeated as many times as required, and all of the stored spectrum values are modified by correction values generated on the basis of all stored zero level values.
Claim 6
Dependent Claim
58 words
The method according to claim 2 or 3, characterized by always performing a zero level signal measurement subsequent to zeroing the intensity measuring unit and prior to the succeeding one or more spectrum signal measurements and storing the measured zero level value and this/these zero level value(s) is/are also taken into consideration when modifying the stored spectrum values.
Claim 7
Independent Claim
52 words
The method according to any of claims 1 to 4, characterized in that the measurement of the zero level signal and the storage of the zero level value are performed by successively measuring the signal produced by the intensity measuring unit in an unradiated condition several times and storing the values measured.
Claim 8
Independent Claim
31 words
The method according to any of claims 1 to 5, characterized in that the one or more spectrum signal measurements are performed by successively measuring at a single wavelength several times.
Claim 9
Independent Claim
35 words
The method according to any of claims 1 to 5, characterized in that the one or more spectrum signal measurements are performed by successively measuring at each of the required wavelengths one or more times.
Claim 10
Independent Claim
36 words
The method according to any of claims 1 to 7, characterized in that the modification of the stored spectrum values is performed by subtracting correction values generated by interpolation based on the stored zero level values.
Claim 11
Independent Claim
38 words
The method according to any of claims 1 to 7, characterized in that the modification of the stored spectrum values is performed by subtracting correction values generated by interpolation and extrapolation based on the stored zero level values.
Claim 12
Dependent Claim
47 words
The method according to claim 8 or 9, characterized in that the interpolation between the zero value taken at the time of zeroing and the zero level value measured thereafter or between two successively measured zero level values is performed by considering a linear function versus time.
Claim 13
Dependent Claim
49 words
The method according to claim 8 or 9, characterized in that in the case of more than two successively measured zero level values, the interpolation is performed by determining a function versus time approximating the measured zero level values and considering this function as a basis for the interpolation.
Claim 14
Independent Claim
144 words
An apparatus for measuring the spectrum of a material, comprising a controllable monochromator (1) emitting radiation of a required wavelength onto a sample (10) of the material to be tested, an intensity measuring unit (34) provided with a sensor (11) sensitive to the radiation reflected or transmitted by the sample (10), a data processing unit (14) connected to the intensity measuring unit (34) via an analog-to-digital converter (13), and a control unit controlling the analog-to-digital converter (13) synchronously with the monochromator (1) while irradiating the sample (10) ' with radiation of the required wavelength, characterized in that said control unit comprises means (17, 7, 27, 29, 21, 19; 40; 41) to provide at least one start signal onto a control input (31) of the analog-to-digital converter (13) prior to and/or after the period of irradiating the sample (10) with radiation of the required wavelength.
Claim 15
Independent Claim
144 words
An apparatus for measuring the spectrum of a material, comprising a controllable monochromator (1) emitting radiation of a required wavelength onto a sample (10) of the material to be tested, an intensity measuring unit (34) provided with a sensor (11) sensitive to the radiation reflected or transmitted by the sample (10), a data processing unit (14) connected to the intensity measuring unit (34) via an analog-to-digital converter (13), and a control unit controlling the analog-to-digital converter (13) synchronously with the monochromator (1) while irradiating the sample (10) ' with radiation of the required wavelength, characterized in that said control unit comprises means (17, 7, 27, 29, 21, 19; 40; 41) to provide at least one start signal onto a control input (31) of the analog-to-digital converter (13) prior to and/or after the period of irradiating the sample (10) with radiation of the required wavelength.
Claim 16
Dependent Claim
167 words
The apparatus according to claim 12, characterized in that said control unit comprises a rotatable member (7) attached to a shaft (2) controlling the wavelength of the radiation emitted by the monochromator (1), an auxiliary light source (17) and an auxiliary detector (21) sensitive to the light of the auxiliary light source (17), said rotatable member (7) being positioned between the monochromator (1) and the sample (10) as well as between the auxiliary light source (17) and the auxiliary detector (21), said rotatable member (7) being provided with a radiation-transparent section (25) formed as a diaphragm in the path of the radiation beam emitted by the monochromator (1) and at least one first opening (27, 29) transparent to light and formed as a diaphragm in the path of the light beam of the auxiliary light source (17) and positioned rotationally preceding and/or succeeding said radiation-transparent section (25), and an output of the auxiliary detector (21) being connected to the control input (31) of the analog-to-digital converter (13).
Claim 17
Dependent Claim
48 words
The apparatus according to claim 13, characterized in that said rotatable member (7) is provided with at least one transparent second opening (26) rotationally aligned with said radiation-transparent section (25) and formed as a diaphragm in the path of the light beam of the auxiliary light source (17).
Claim 18
Dependent Claim
94 words
The apparatus according to claim 13 or 14, characterized by comprising a further auxiliary light source (18) and a further auxiliary detector (22) sensitive to the light of said further auxiliary light source (18), said rotatable member (7) being provided with a transparent third opening (23) formed as a diaphragm in the path of the light beam of the further auxiliary light source (18) and positioned rotationally preceding said radiation-transparent section (25), and an output of the further auxiliary detector (22) is connected to a zeroing input (32) of the intensity measuring unit (34).
Claim 19
Independent Claim
27 words
The apparatus according to any of claims 13 to 15, characterized in that said rotatable member (7) is formed like a disc, a cup or a drum.
Claim 20
Dependent Claim
34 words
The apparatus according to claim 13, characterized in that said output of the auxiliary detector (21) is connected to the control input (31) of the analog-to-digital converter (13) via an electronic timing circuit (40).
Claim 21
Dependent Claim
29 words
The apparatus according to claim 17, characterized in that an output of the timing circuit (40) is connected to a zeroing input (32) of the intensity measuring unit (34).
Claim 22
Dependent Claim
45 words
The apparatus according to claim 17 or 18, characterized in that the timing circuit (40) includes digital circuits to produce several succeeding pulses following each other in a fixed time interval on an output connected to the control input (31) of the analog-to-digital converter (13).
Claim 23
Dependent Claim
18 words
The apparatus according to claim 17 or 18, characterized in that the timing circuit (40) is a microprocessor.
Claim 24
Independent Claim
48 words
The apparatus according to any of claims 13 to 20, characterized by comprising a motor (3) to drive the shaft (2) controlling the monochromator (1), said motor (3) being connected to one of the control outputs of the data processing unit (14) via a motor control unit (28).
Claim 25
Dependent Claim
59 words
The apparatus according to claim 12, characterized in that the data processing unit and the control unit are realized by a microprocessor (41) having first and second control outputs, the first control output being connected to the control input (31) of the analog-to-digital converter (13) and the second control output being connected to a device controlling the monochromator (1).
Claim 26
Dependent Claim
31 words
The apparatus according to claim 22, characterized in that the microprocessor (41) has a third control output which is connected to a zeroing input (32) of the intensity measuring unit (34).
Claim 27
Dependent Claim
38 words
The apparatus according to claim 22 or 23, characterized in that the monochromator (1) is controlled by a stepper motor (45) being connected to said second control output of the microprocessor (41) via a motor control unit (46).
Claim 28
Dependent Claim
52 words
The apparatus according to claim 23 or 24, characterized by comprising an electromagnetically operated diaphragm (42) in the path of the radiation beam emitted by the monochromator (1) and a driver unit (44) for the diaphragm (42), said driver unit (44) being connected to a fourth control output of the microprocessor (41).
Claim 29
Independent Claim
21 words
The apparatus according to any of claims 12 to 25, characterized in that the analog-to-digital converter (13) is of integrating type.
References Cited (Backward Citations)
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