Biochemical analyzer (BCA) is an analytical instrument used to measure various biochemical indicators of human blood. It can provide doctors and chemical laboratory personnel with testing data accurately and quickly, and plays an important role in monitoring bed diagnosis and chemical testing. The colorimeter is the core component of the biochemical analyzer. In traditional colorimeters, Prism is often used as a spectroscopic device, although the price is relatively low. However, because the prism can only form a group of optical ports, and the resolution, spectral efficiency and light transmission rate are not high, the application in actual field measurement is greatly limited. For spectral detection, traditional colorimeters often use photomultiplier tubes and wavelength scanning to achieve photoelectric conversion and spectral detection scanning, which are not only large in size, slow in speed, but also unfavorable for online satellite and industrial use. The portable colorimeter has the advantages of low price, USB interface, LED display operation panel, clear data, high integration, high resolution, large dynamic range and high signal-to-noise ratio, which are widely used in many cities. In addition, the emergence and development of virtual appliance technology. To a certain extent, the traditional meaning of the instrument has been changed, so that the function of the traditional instrument is stressed, and the membrane software is the instrument fork. development of these devices and technologies. Makes the colorimeter miniaturized, efficient and cost-effective.
In order to overcome the above-mentioned shortcomings of traditional colorimeters in practical use, a handheld color meter for miniaturized chemical and biochemical analyzers is proposed in this paper. Using linear array CC combined with peripheral interconnect (PCI) bus high-speed data acquisition card to form a biochemical spectrum receiving and detection system, using virtual longitudinal instrument technology, the acquisition of optical latent data and post-data analysis and processing are realized through software programming, and by optimizing the optical path Structure and software algorithms, etc. improve the overall performance of the colorimeter. The results show. The optical path of the CT color spectrophotometry of the colorimeter has line radiation, coma aberration, good imaging quality, simple and compact structure, etc. The volt point passes through a high-performance CCD spectrum receiving and detection system and adopts wavelet elimination and automatic adjustment. The software processing algorithms such as CCD vision time 4 greatly improve the spectral measurement accuracy and signal-to-noise ratio, especially the detection of the spectral absorption intensity of samples in the ultraviolet and visible bands is greater than 1000(a.u).
In the colorimeter system, the optical path system is the front end of the handheld colorimeter. The spectroscopic system uses a high-performance line grating to avoid the spectral transmittance problem caused by the traditional prism spectroscopic system and increases the dispersion rate by dozens of times. It effectively alleviates the contradiction between resolution and luminous flux, and can significantly improve the performance of the colorimeter. At present, the dispersive devices in the spectroscopic systems of some spectrometers use concave optical structures. Although the structure is simple, the process is complicated, the cost is expensive, and the stray light is serious. As shown in the figure, the main advantages of this optical path structure are: low cost, many structural parameters that can be adjusted and arranged, which can avoid secondary or multiple line radiation and stray light; The design of large and high imaging quality in a considerable range facilitates the use of photoelectric array detectors to receive spectra.
With the development of computer and spectroscopic analysis technology. Miniaturized, high-performance handheld color meter will become the mainstream of future instrument development. Due to some defects of the traditional colorimeter, the portable photometer is presented with the characteristics of low cost and high performance. Provide users with accurate and fast color management and application, using a high-capacity lithium-ion battery, the digital display is clear, easy to use.
