A calibration method for photon counters using a customized standard light source

2016 ◽  
Author(s):  
Shulang Lin ◽  
Huarong Gu ◽  
Qiaofeng Tan
Keyword(s):  
Light Source ◽  
Calibration Method

scholarly journals Luxmeter Design with Proximity Sensor to Efficiently Test Light Intensity and Distance on Lamp Operation in Hospitals

2021 ◽  
Vol 1 (1) ◽  
pp. 20-25
Author(s):  
Dika Surya Rizky Rahayu ◽  
M. Ridha Mak'ruf ◽  
Syaifudin Syaifudin
Keyword(s):  
Light Intensity ◽  
Light Source ◽  
Calibration Method ◽  
Operating Table ◽  
Proximity Sensor ◽  
Cutting Surface ◽  
Sensor Module ◽  
Distance Setting

The lighting of the operating/surgical site depends on the quality of the lighting from the overhead light source and the reflection from the curtain. Light measurement on the operating table is very necessary because it generates light that is irradiated into the cutting wound without dazzling the cutting surface so that pathological conditions can be recognized and must provide depth contrast and anatomical relationships, to ensure this proper calibration method is needed. Long-term use of medical devices can cause changes in accuracy. Therefore, the author makes a tool to measure the intensity of light which is equipped with a distance meter. The purpose of this study was to develop a measuring instrument for measuring the intensity of light in operating lamps, namely a luxmeter by making Luxmeter equipped with a TFT Display Distance Sensor. This tool uses an ultrasonic sensor HC-SR04 to measure the distance between the light source and the sensor module and the MAX44009 sensor to measure the light intensity of the operating lamp displayed on the TFT screen. Based on the module distance setting to the roll meter, the distance error value for the measurement of the Surabaya electromedical engineering workshop lamp at the 75 cm roll meter distance setting is 0.0127% for the 100 cm roll meter distance setting is 0.0045%. The error rate of the light intensity module on the results of the measurement of light intensity on the luxmeter by setting the roll meter distance of 75 cm between the tool and the lamp of the electromedical engineering workshop is getting an error value of 0.082% lux and for the light intensity on the results of the measurement of light intensity on the luxmeter with a roll meter distance setting of 100 cm between the tool and the lamp in the electromedical engineering workshop, that is, the error value of lux is 0.055%. The design of a luxmeter equipped with a proximity sensor can measure the intensity of light and the distance between the tool and the light source and can assist in the learning process with a more effective Luxmeter design that will assist electromedics in testing operating lamps in hospitals to be more efficient.

Messung der Oszillatorenstärken von SiI-, SiII-und SiIII-Linien im Wellenlangenbereich 1100 — 2600 Å und Vergleich des Vakuum-UV-Strahlungsnormals mit dem Kohlebogen

1969 ◽  
Vol 24 (6) ◽  
pp. 990-997
Author(s):  
W. Hofmann
Keyword(s):  
Light Source ◽  
Transition Probability ◽  
Wavelength Region ◽  
Calibration Method ◽  
Oscillator Strengths ◽  
Silicon Tetrafluoride ◽  
Full Agreement ◽  
Cascade Arc ◽  
Carbon Arc ◽  
Vacuum Uv

The oscillator strengths of 72 Si I-, Si II- and Si III-lines and multiplets in the wavelength region 1100 -2600 Å were measured in emission. The light source was a wall-stabilized arc burning in argon at atmopheric pressure into which small amounts of silicon tetrafluoride and fluorine were introduced. All oscillator strengths were measured relatively and then put on an absolute scale by using the value Anm = 1,64 · 108 sec-1 for the transition probability of the Si I-multiplet 2506 Å to 2528 Å. The vacuum-UV intensity calibration method using the central intensities of optically thick lines in the cascade arc was extended up to the wavelength 2516 Å. In this wavelength region it could be directly compared with the radiation of the anode crater of the carbon arc. Full agreement between these two intensity standards was found.

Spectral Calibration Method for Spectral Domain Coherence Tomography with Ultra-Wideband Light Source

2019 ◽  
Vol 56 (10) ◽  
pp. 101103
Author(s):  
曹文娟 Cao Wenjuan ◽  
高万荣 Gao Wanrong ◽  
伍秀玭 Wu Xiupin
Keyword(s):  
Light Source ◽  
Calibration Method ◽  
Ultra Wideband ◽  
Spectral Domain ◽  
Spectral Calibration

Illuminance meter calibration with an LED spectrally tunable light source

2020 ◽  
Vol 52 (8) ◽  
pp. 1009-1019 ◽  
Author(s):  
K Godo ◽  
Y Tamura ◽  
O Watari
Keyword(s):  
Light Source ◽  
Calibration Method ◽  
Reference Plane ◽  
Lamp Method ◽  
Calibration System ◽  
Indoor Lighting ◽  
Incandescent Lamps ◽  
Standard Lamp

Calibration of an illuminance meter is indispensable for accurate measurement of the illuminance of indoor lighting and daylight. In recent years, because of the phasing-out of incandescent lamps and their replacement with LED lamps, it has become difficult to obtain an incandescent type standard lamp to calibrate an illuminance meter. To replace the standard lamp method, we constructed an illuminance meter calibration system based on an LED-based spectrally tunable light source. The approximate CIE Illuminant A spectrum realized by the LED-based spectrally tunable light source was controlled at various illuminance values (800–10,000 lx). A test illuminance meter was calibrated by comparison against a reference photometer with the realized approximate Illuminant A spectrum. The illuminance values measured using the reference photometer and using the test illuminance meter in the calibration system agreed within 2.5% without reference plane correction of the test illuminance meter, and within 1% with reference plane correction. Reference plane correction depends strongly on the measurement distance and the illuminance meter structure. This study demonstrated that it can be improved. Therefore, we infer that an illuminance meter calibration method using an LED-based spectrally tunable light source is a promising means of overcoming difficulties posed by the phasing-out of incandescent standard lamps.

Light source position calibration method for photometric stereo in capsule endoscopy

2020 ◽  
Vol 34 (12) ◽  
pp. 789-801
Author(s):  
Yang Hao ◽  
Marco Visentini-Scarzanella ◽  
Jing Li ◽  
Peisen Zhang ◽  
Gastone Ciuti ◽  
...  
Keyword(s):  
Light Source ◽  
Capsule Endoscopy ◽  
Calibration Method ◽  
Photometric Stereo ◽  
Source Position ◽  
Position Calibration

Color Calibration Method Based on Spectrally Reproduced Colors and its Application to XYZ-Type Digital Camera

2011 ◽  
Vol 222 ◽  
pp. 98-101
Author(s):  
M. Kretkowski ◽  
Ryszard Jabłoński ◽  
Y. Shimodaira
Keyword(s):  
Light Source ◽  
Narrow Band ◽  
Digital Camera ◽  
Color Difference ◽  
Calibration Method ◽  
Primary Color ◽  
Color Calibration ◽  
Average Color ◽  
Digitally Controlled

This paper presents the development of a color calibration method based on spectrally reproduced colors produced by multi-primary color narrow-band LED’s. The additive mixture of the primary colors can spectrally reproduce an object color. This approach has been used in our work to overcome the insufficient calibration results obtained by commonly used color targets such as the Macbeth Chart. The method has been tested using a developed prototype of digitally controlled light source calibrated to simulate object color under D65 Daylight standard illumination. The method allows for obtaining of the average color difference for the calibrated XYZ camera of ∆E=0.79 and shows significant improvement in comparison with calibration using standard Macbeth (∆E=1.47). Moreover, we explain the advantages of color calibration with usage of multi-primary light source with regard to the amount of the primary colors.

A Method for Setting the Clearance Angle

1972 ◽  
Vol 30 ◽  
pp. 388-389
Author(s):  
Michael T. Bucek ◽  
Howard J. Arnott
Keyword(s):  
Experimental Evidence ◽  
Light Source ◽  
Black Spot ◽  
Critical Factor ◽  
Clearance Angle ◽  
Crude Approximation ◽  
Ultrathin Sections

It is believed by the authors, with supporting experimental evidence, that as little as 0.5°, or less, knife clearance angle may be a critical factor in obtaining optimum quality ultrathin sections. The degree increments located on the knife holder provides the investigator with only a crude approximation of the angle at which the holder is set. With the increments displayed on the holder one cannot set the clearance angle precisely and reproducibly. The ability to routinely set this angle precisely and without difficulty would obviously be of great assistance to the operator. A device has been contrived to aid the investigator in precisely setting the clearance angle. This device is relatively simple and is easily constructed. It consists of a light source and an optically flat, front surfaced mirror with a minute black spot in the center. The mirror is affixed to the knife by placing it permanently on top of the knife holder.

A confocal laser scanning microscope for fluorescence and reflection at video rates

1989 ◽  
Vol 47 ◽  
pp. 134-135
Author(s):  
P.M. Houpt ◽  
A. Draaijer
Keyword(s):  
Light Source ◽  
Laser Scanning ◽  
Focal Point ◽  
Confocal Laser Scanning Microscope ◽  
Confocal Laser ◽  
Point Light Source ◽  
Volume Of Interest ◽  
Ion Laser ◽  
Point Light ◽  
Point Detector

In confocal microscopy, the object is scanned by the coinciding focal points (confocal) of a point light source and a point detector both focused on a certain plane in the object. Only light coming from the focal point is detected and, even more important, out-of-focus light is rejected.This makes it possible to slice up optically the ‘volume of interest’ in the object by moving it axially while scanning the focused point light source (X-Y) laterally. The successive confocal sections can be stored in a computer and used to reconstruct the object in a 3D image display.The instrument described is able to scan the object laterally with an Ar ion laser (488 nm) at video rates. The image of one confocal section of an object can be displayed within 40 milliseconds (1000 х 1000 pixels). The time to record the total information within the ‘volume of interest’ normally depends on the number of slices needed to cover it, but rarely exceeds a few seconds.

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