Determining a size of cell of a transmission spectroscopy device
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-021/00
G01J-003/02
G01J-003/42
G01B-011/02
G01J-003/28
G01N-021/3577
G01N-033/04
G01N-021/27
출원번호
US-0723912
(2017-10-03)
등록번호
US-10156474
(2018-12-18)
발명자
/ 주소
Parsons, Craig
Lyder, Henrik
출원인 / 주소
Bentley Instruments, Inc.
대리인 / 주소
Schwegman Lundberg & Woessner, P.A.
인용정보
피인용 횟수 :
0인용 특허 :
18
초록▼
A transmission spectroscopy device can direct light into a sample, and determine properties of the sample based on how much light emerges from the sample. The device can use a cell to contain the sample, so that the size of the cell defines the optical path length traversed by light in the sample. T
A transmission spectroscopy device can direct light into a sample, and determine properties of the sample based on how much light emerges from the sample. The device can use a cell to contain the sample, so that the size of the cell defines the optical path length traversed by light in the sample. To ensure accuracy in the measurements, it is beneficial to calibrate the device by measuring the size of the cell periodically or as needed. To measure the size of the cell, the device can perform a transmission spectroscopy measurement of a known substance, such as pure water, to produce a measured absorbance spectrum of the known substance. The device can subtract a known absorbance spectrum of the known substance from the measured absorbance spectrum to form an oscillatory fringe pattern. The device can determine the size of the cell from a period of the fringe pattern.
대표청구항▼
1. A transmission spectroscopy device, comprising: a cell having opposing first and second transparent walls, the cell being fillable with a sample to be measured, the cell being drainable to remove the sample and replace the sample with air; anda controller configured to fill the cell with the samp
1. A transmission spectroscopy device, comprising: a cell having opposing first and second transparent walls, the cell being fillable with a sample to be measured, the cell being drainable to remove the sample and replace the sample with air; anda controller configured to fill the cell with the sample, produce a measured absorbance spectrum of the sample, and drain the sample from the cell,the controller further configured to calibrate the transmission spectroscopy device by: producing a measured absorbance spectrum of a known substance sample of a known substance, the measured absorbance spectrum of the known substance sample formed from a ratio of a first emittance scan of the cell to a second emittance scan of the cell, the first emittance scan taken when the cell is filled with the known substance sample, the second emittance scan taken when the cell is empty;subtracting a known absorbance spectrum of the known substance from the measured absorbance spectrum of the known substance sample to form a fringe pattern, the fringe pattern being oscillatory in amplitude with respect to inverse wavelength; anddetermining a size of the cell from a period of the fringe pattern. 2. The transmission spectroscopy device of claim 1, wherein the controller is further configured to determine the size of the cell from the period of the fringe pattern by: calculating the separation between the first and second transparent walls to equal 1/(2×p), where quantity p is a period of the fringe pattern. 3. The transmission spectroscopy device of claim 2, wherein the controller is further configured to determine the size of the cell from the period of the fringe pattern by: determining inverse wavelength values at which the fringe pattern peaks; andcalculating the period to equal a separation between adjacent determined inverse wavelength values. 4. The transmission spectroscopy device of claim 3, wherein the controller is further configured to calculate the period by: fitting the determined inverse wavelength values to a linear fit;determining a slope of the linear fit; andsetting the period equal to the determined slope. 5. The transmission spectroscopy device of claim 1, wherein the controller is further configured to produce the measured absorbance spectrum of the known substance sample of the known substance by: filling the cell with the known substance;illuminating the known substance through the first transparent wall of the cell;measuring a first light from the known substance through the second transparent wall of the cell;producing, from the first light, the first emittance scan;draining the known substance from the cell;filling the cell with air;illuminating the air-filled cell through the first transparent wall of the cell;measuring a second light from the air-filled cell through the second transparent wall of the cell; andproducing, from the second light, the second emittance scan. 6. The transmission spectroscopy device of claim 5, wherein the size of the cell corresponds to a separation between the first and second transparent walls of the cell. 7. The transmission spectroscopy device of claim 5, further comprising: a light source configured to provide illumination to the known substance and the air-filled cell through the first transparent wall with light having a broad spectrum, the controller being further configured to operably control the light source. 8. The transmission spectroscopy device of claim 7, wherein: the known substance is water; andthe broad spectrum includes at least one peak or valley in the known absorbance spectrum of water. 9. The transmission spectroscopy device of claim 5, wherein the controller is further configured to drain the known substance from the cell by, repeatedly: pumping air through the cell;illuminating the cell through the first transparent wall of the cell;measuring a third light through the second transparent wall of the cell; andcomparing the third light to a previous measurement of the third light, until a difference between successive measurements of the third light is below a threshold. 10. The transmission spectroscopy device of claim 1, wherein the controller is further configured to subtract the known absorbance spectrum of the known substance from the measured absorbance spectrum by: scaling an amplitude of one of the known absorbance spectrum or the measured absorbance spectrum to match an amplitude of the other of the known absorbance spectrum or the measured absorbance spectrum. 11. The transmission spectroscopy device of claim 1, further comprising: plumbing configured to deliver the sample to the cell, drain the sample from the cell, deliver the known substance sample to the cell, and drain the known substance sample from the cell, the controller being further configured to operably control the plumbing. 12. The transmission spectroscopy device of claim 1, further comprising: a detector configured to detect light transmitted through the sample and through the known substance sample through the second transparent wall, the controller further configured to operably receive at least one signal from the detector. 13. The transmission spectroscopy device of claim 1, wherein the controller is further configured to calibrate the transmission spectroscopy device by storing the determined size of the cell on a storage device. 14. The transmission spectroscopy device of claim 13, wherein the controller is configured to perform a subsequent transmission spectroscopy measurement of a subsequent sample by reading the stored size of the cell from the storage device, and using the stored size of the cell to determine a property of the subsequent sample. 15. A transmission spectroscopy device, comprising: a cell having opposing first and second transparent walls, the cell being fillable with a sample to be measured, the cell being drainable to remove the sample and replace the sample with air;plumbing configured to deliver the sample to the cell and drain the sample from the cell;a light source configured to illuminate the sample through the first transparent wall;a detector configured to detect light transmitted through the sample through the second transparent wall; anda controller configured to operably control the light source, operably receive at least one signal from the detector, and operably control the plumbing,the controller configured to fill the cell with the sample, produce a measured absorbance spectrum of the sample, and drain the sample from the cell,the controller further configured to calibrate the transmission spectroscopy device by: producing a measured absorbance spectrum of a known substance sample of a known substance, the measured absorbance spectrum of the known substance sample formed from a ratio of a first emittance scan of the cell to a second emittance scan of the cell, the first emittance scan taken when the cell is filled with the known substance sample, the second emittance scan taken when the cell is empty;subtracting a known absorbance spectrum of the known substance from the measured absorbance spectrum of the known substance sample to form a fringe pattern; anddetermining a size of the cell from the fringe pattern. 16. The transmission spectroscopy device of claim 15, wherein: the fringe pattern is oscillatory in amplitude with respect to inverse wavelength; andthe controller is further configured to determine the size of the cell from the fringe pattern by:calculating the separation between the first and second transparent walls to equal 1/(2×p), where quantity p is a period of the fringe pattern. 17. The transmission spectroscopy device of claim 16, wherein the controller is further configured to determine the size of the cell from the period of the fringe pattern by: determining inverse wavelength values at which the fringe pattern peaks; andcalculating the period to equal a separation between adjacent determined inverse wavelength values. 18. The transmission spectroscopy device of claim 17, wherein the controller is further configured to calculate the period by: fitting the determined inverse wavelength values to a linear fit;determining a slope of the linear fit; andsetting the period equal to the determined slope. 19. The transmission spectroscopy device of claim 15, wherein the controller is further configured to produce the measured absorbance spectrum of the known substance sample of the known substance by: filling the cell with the known substance;illuminating the known substance through the first transparent wall of the cell;measuring a first light from the known substance through the second transparent wall of the cell;producing, from the first light, the first emittance scan;draining the known substance from the cell;filling the cell with air;illuminating the air-filled cell through the first transparent wall of the cell;measuring a second light from the air-filled cell through the second transparent wall of the cell; andproducing, from the second light, the second emittance scan. 20. The transmission spectroscopy device of claim 19, wherein the size of the cell corresponds to a separation between the first and second transparent walls of the cell. 21. The transmission spectroscopy device of claim 20, wherein: the known substance is water; andthe broad spectrum includes at least one peak or valley in the known absorbance spectrum of water. 22. A transmission spectroscopy device, comprising: a cell having opposing first and second transparent walls, the cell being fillable with a sample to be measured, the cell being drainable to remove the sample and replace the sample with air;plumbing configured to deliver the sample to the cell and drain the sample from the cell;a light source configured to illuminate the sample through the first transparent wall;a detector configured to detect light transmitted through the sample through the second transparent wall; anda controller configured to operably control the light source, operably receive at least one signal from the detector, and operably control the plumbing,the controller configured to fill the cell with the sample, produce a measured absorbance spectrum of the sample, and drain the sample from the cell,the controller further configured to calibrate the transmission spectroscopy device by: producing a measured absorbance spectrum of a pure water sample, the measured absorbance spectrum of the pure water sample formed from a ratio of a first emittance scan of the cell to a second emittance scan of the cell, the first emittance scan taken when the cell is filled with the pure water sample, the second emittance scan taken when the cell is empty;subtracting a known absorbance spectrum of water from the measured absorbance spectrum of the pure water sample to form a fringe pattern, the fringe pattern being oscillatory in amplitude with respect to inverse wavelength; andcalculating the separation between the first and second transparent walls to equal 1/(2×p), where quantity p is a period of the fringe pattern.
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