Abstract:
This invention relates to an apparatus for evaluating the quality of rice grains. The apparatus comprises a near infrared spectrometer having a band-pass filter and detectors for detecting the intensity of reflected light from the sample rice; a control device having a memory for storing various values and a calculator for performing various calculations; indicating device for displaying or printing the various calculated values; and a sample case for being filled with the sample rice and being disposed at the measuring portion within the near infrared spectrometer. The apparatus is capable of measuring the content percentages of pre-selected constituent or constituents, such as, of protein, either amylose or amylopectin and moisture of the rice grains, calculating a quality evaluation value of the sample rice based on the measured and calculated values and powers established for the preselected constituents, and displaying the calculated evaluation value of the sample rice.
Abstract:
An accessory is provided to convert a conventional microscope to a microspectrofluorimeter. The accessory includes a filter disc having bandpass filters separated by opaque segments. The filter disc is rapidly and continuously rotated to move the filter sequentially into the optical path between a wideband light source and a microscope sample. Photon counting of radiation from the sample is synchronized to the position of the filters during rotation by means of synchronization marks on the filter disc. The same accessory may be positioned between the sample and a detector to detect emitted light of different frequencies.
Abstract:
Automatic zeroing apparatus zeroes an infrared gas analyzer automatically upon the occurrence of preselected conditions to indicate zero in the absence of absorption of infrared radiation by a gas mixture being analyzed. The gas analyzer has a sample cell for containing a gas mixture to be analyzed. Infrared radiation directed through the sample cell is detected at a preselected wavelength to produce a detection signal. A signal processor outputs a signal systematically related to the difference between the detection signal and a reference signal. For zeroing the sample cell is filled with gas substantially nonabsorbent of infrared radiation at the respective characteristic wavelength. A comparator produces an error signal when the output signal differs from zero. A gain control automatically controls the signal level of the detection signal to reduce the output signal substantially to zero with the nonabsorbent gas filling the sample cell. The preselected conditions may include the passage of a predetermined time and a temperature drift beyond a predetermined limit.
Abstract:
An apparatus and method is provided for infrared qualitative analysis of a fluid independent of the temperature of the fluid. A first signal is generated in response to detected infrared energy passing through the fluid, and a second datum signal is provided for comparison with the first signal, wherein the second signal indicates a non-radiating state. The energy difference between the two signals is provided to a microprocessor control system for computing the fluid quality as a function of the energy difference independent of the temperature of the fluid.
Abstract:
Disclosed is a low-cost, portable photo thermal spectroscopy (PTS) reader for use in detecting the presence of diseases in the bodily fluid of affected patients. The PTS reader is designed to be durable, easy to use and provide readings from the Lateral Flow Assay (LFA) with rapid results. Also provided are methods of use.
Abstract:
A method for monitoring surface phenomena comprises: - measuring a first surface plasmon resonance angle value (ϕ SPR,REF ) of a sample region (REG1), - measuring a first critical angle value (ϕ TIR,REF ) of the sample region (REG1), - causing a change of surface concentration (c M1,SRF ) of an analyte (M1) at the sample region (REG1), - changing the bulk composition at the sample region (REG1), - measuring a second surface plasmon resonance angle value (ϕ SPR (t)) of the sample region (REG1), - measuring a second critical angle value (ϕ TIR (t)) of the sample region (REG1), and - determining an indicator value (ϕ AUX (t)) indicative of the change of the surface concentration (c M1,SRF ), wherein the indicator value (ϕ AUX (t)) is determined from the second surface plasmon resonance angle value (ϕ SPR (t)) by compensating an effect of the bulk composition, and wherein the magnitude (ϕ COMP ) of said effect is determined by using the second critical angle value (ϕ TIR (t)).
Abstract:
A gemstone tester for characterising a gemstone and a method of characterising a gemstone are provided, the gemstone tester comprising a detector unit for detecting one or more transmittances of the gemstone; and a processing unit for determining a first parameter based on one or more of the transmittances of light; and for characterising the gemstone based on the first parameter; wherein each transmittance of the gemstone is a fraction of light of a specific wavelength that is passed through the gemstone.