摘要:
A zero point adjustment is performed by generating no signal state of a CCD camera. A state in which stray light does not enter the CCD camera is ensured by a calibration shutter. An output signal of the CCD camera is transmitted to a light amount calculator, and a calibrating section executes a calibration for the light amount calculator by using an output signal value as a reference (zero point). Further, light outputted from a laser light source is attenuated by an optical attenuator and is made to be incident on the CCD camera. By switching an attenuating amount of the optical attenuator, correctly set light is made to be incident on the CCD camera. The output signal of the CCD camera is transmitted to the light amount calculator, and the calibrating section executes the calibration such that values of the respective output signals correctly correspond to respective light amounts.
摘要:
A method for measuring a fluorescent light amount, whereby a specimen is irradiated with excitation light, and fluorescent light generated from the specimen is measured by a light-receiving element via of a receiving optical system, the method includes the steps of irradiating the specimen with excitation light having a light-amount value per specified unit area traceable to the national standard, and designated on the surface of the specimen beforehand, causing the light-receiving element to measure the fluorescent light generated from the specimen, and computing a fluorescent light-amount as measured by the light-receiving element of the receiving optical system on the basis of an excitation light-amount per the specified unit area, optical coefficients of the receiving optical system, and the acceptance coefficient of the light-receiving element, thereby working out a light amount value per the unit area traceable to the national standard.
摘要:
A resonance thermometer utilizing nuclear quadrupole resonance, nuclear magnetic resonance or like resonance-absorption phenomenon. The thermometer includes an oscillator for oscillatively detecting a resonance in a resonant material, a means for modulating the oscillation frequency of the oscillator at a low frequency, a first detecting means with a short time constant for detecting a component from the modulated output of the oscillator, and a second detecting means with a long time constant for detecting a component from the modulated output of the oscillator. The oscillator frequency is swept in linear ramp fashion at high speed until an output from the first detecting means occurs, at which point the frequency sweep is stopped. The precise resonance-absorption frequency of the resonant material then is found by using the output of the second detecting means, and the temperature is derived from the precise resonance-absorption frequency.