摘要:
An apparatus and method for measuring component concentrations which enables accurate measurement of concentrations of component within an object in a non-destructive, non-invasive, and bloodless procedure. The apparatus comprises a light irradiator 1 for projecting pulse laser of different wavelengths toward an object 12 by means of a variable wavelength laser generating unit 11, a photodetector 2 for performing a time resolved measurement of the quantity of transmitted light from the object which is subject to changes with lapse of time after the generation of the pulse laser, and an arithmetic unit 3 for calculating concentrations of components in the object 12 and outputting the calculation result such that the relationship between time lapse and measured quantity of light is converted into a relationship between an optical path length representing the distance of light travel within the object 12 and a change in the measured quantity of light relative to a change in unit concentration so that the optical path length and the quantity of light which is measured when the change in the quantity of light is at a peak are stored in memory for each wavelength, the quantity of light being used as a basis for the calculation.
摘要:
An apparatus and method for optically measuring concentrations of components allow enhancement in measurement accuracy of concentration. The apparatus includes a cell, a light irradiator, a photodetector, and an arithmetic unit. The cell presents different optical path lengths at different locations and is to contain a sample therein. The light irradiator, which includes a variable-wavelength laser generator and a measuring system composed of convex lenses, outputs a collimated, enlarged laser beam, and makes the laser beam incident upon the cell. The photodetector comprises a multiplicity of photodetectors arranged in parallel to the surface of the cell, so that it can detect intensity of rays of transmitted light that have traveled over different optical path lengths at positions of an equal distance from the cell. The arithmetic unit, receiving a signal from the individual photodetectors, calculates concentrations of components in the sample based on optimum optical path lengths for different wavelengths and values of transmitted light at positions of the optimum optical path lengths, and further outputs calculation results.
摘要:
To project measuring light with good reproducibility onto the measuring part of a measured object so that measurement conditions can always be constant. An optical measuring apparatus is equipped with a spectroscopic analyzer that detects the spectral intensity of the reflected light of measuring light projected onto a human hand. Spectroscopic analyzer moves in the direction" of the X-axis, Y axis, and Z axis, and around the Z axis by a moving mechanism. During the registration of the measuring part of the human hand, a CCD camera takes a picture of the human hand, and the operator selects a part having a feature from the pattern of the taken image. During the spectrometry, the CCD camera again takes a picture of the human hand. The optical measuring apparatus then detects the registered feature part on the currently taken image, moves spectroscopic analyzer by moving mechanism, and projects measuring light onto the registered feature part.
摘要:
To secure a highly accurate measurement value of biological information with minimized variation by positioning a target part of a living body with good reproducibility and by positioning the target part of the living body easily with high reproducibility without pressing blood vessels in the living body. The concentration of a particular component in the living body is measured by the use of a transmitted or reflected spectrum obtained by projecting light onto the target part of the living body. A biological information measuring template 2 includes a shape memory medium 6 having a contact surface which, when the target part is pressed to the contact surface, undergoes change according to the shape of the target part, to thereby store the shape. The target part 1 of the living body is arranged at a store portion of the shape memory medium and is illuminated by light. The spectrum of light transmitted through or reflected from the target part 1 is arithmetically processed in an arithmetic control means 4 to calculate the concentration of the particular component in the living body, a result of calculation being outputted to an output unit 5.
摘要:
A urinal is provided on its forward end with a cell, which internally communicates with the urinal to outwardly project from the same. A measuring part comprises a light source part for applying a measuring beam of the visible or near infrared wavelength region to the cell which is set in a cell setting part and a light receiving part for receiving and detecting the measuring beam transmitted through the cell, and measures absorbances of uric components to be measured at wavelengths selected therefor respectively. A sensor part is adapted to detect that the cell is set in the cell setting part, so that the measuring part starts a measuring operation on the basis of a signal indicating that the sensor detects the cell. It is possible to carry out a urine test on a person who lies on bed.
摘要:
As to reaction solutions in which the amount of each potassium ferricyanate, glucose oxidase and glucose substrate are set at a constant value while glucose concentrations are varied, intensity changes of peaks at a shift wavenumber of 2081 cm.sup.-1 in light scattering spectra are measured every 10 seconds, the maximum values of the intensity changes of the peaks at the respective glucose concentrations obtained, for obtaining a calibration curve from correlations between the maximum values of the reaction velocities and the glucose concentrations. The calibration curve is employed for carrying out quantitative measurement of an unknown sample.
摘要:
In an optical measuring apparatus of the present invention, a spectroscopic optical system emits a measuring light beam that contains a measure light component of a measure wavelength domain where a measured object absorbs part of the light and a reference light component of a reference wavelength domain where the measured object almost completely absorbs the light, and separates the beam into beams, a photometric unit measures the light incident on an integrating sphere when a reference sample is inserted in the light path and stores the measurements in a memory and also measures the light incident on an integrating sphere when a measured object is inserted in the light path, and an arithmetic circuit calculates a light intensity ratio of the compensation light component for the measured object to the compensation light component stored in memory and then estimates background intensities during the measurement by multiplying the measurements stored in the memory by the intensity ratio.
摘要:
As to respective expiration components to be measured, wavelengths having excellent correlations between component concentrations and Raman spectral intensity values are previously selected as measuring wavelengths which are specific to the components, an expiration specimen is irradiated with Raman excitation light, Raman spectra at the measuring wavelength which is specific to nitrogen and those at the measuring wavelengths previously selected for the components to be measured respectively are measured, Raman spectral intensity ratios of the components to the Raman spectral intensity of nitrogen are obtained, and the respective expiration components are quantitatively analyzed through a calibration curve which is previously prepared as to the Raman spectral intensity ratios of the respective components to nitrogen and concentrations. It is possible to provide a measuring method utilizing Raman spectroscopy, which can directly determine intra- expiratory components in a short time with no requirement for expendable items.
摘要:
A measuring beam is incident upon a triangular cell storing a liquid sample, and transmitted light thereof is received by a linear sensor so that both transmitted light intensity and a position of the beam are detected. A refractive index calculating part calculates refractive indices from the position detected by the linear sensor, while an absorbance calculating part calculates absorbance values dependent on component concentration values correcting influence by transmittance change at the triangular cell through the transmitted light intensity values and the refractive indices of the sample calculated at the refractive index calculating part. A component concentration calculating part performs a multivariate analytical operation on the basis of the absorbance values dependent on the component concentration values at a plurality of measuring wavelengths calculated at the absorbance calculating part.
摘要:
A biosensor which electrochemically detects a material which relates to a reaction of a specific compound in a liquid sample with a biologically active substance or its related substance, in which the biologically active material or an optionally used mediator is placed at a part which is remote from a position of an electrode which acts as electrochemical detector means, and optionally the biological active material or the mediator is covered with a polymer layer.