A quantitative sampling device
A quantitative sampling and emission device technology, applied in the field of photoelectric detection, can solve the problems of overflow, inaccurate sampling amount of optical quantitative system, etc., and achieve the effect of solving inaccurate sampling amount and improving practicability and application scope.
Active Publication Date: 2018-08-14
BEIJING SDL TECH
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Problems solved by technology
[0004] The invention provides a quantitative sampling device, which can realize accurate sampling of various samples to be sampled, so as to solve the problem of inaccurate sampling volume in the optical quantitative system in the prior art, and avoid the occurrence of the sample overflowing the sample storage device
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[0034] As mentioned in the background art, the optical quantification system in the prior art has the phenomenon of inaccurate sampling volume, and even overflows the sample storage device in severe cases.
[0035] The inventors have found that this is because the surface tension coefficients of different types of samples to be sampled differ greatly, and some samples to be sampled with small surface tension coefficients will not form a significant meniscus in the quantitative glass tube, and when the When the cleanliness of the quantitative glass tube is different, the shape of the meniscus will change or even disappear. In the case that the meniscus does not exist or is not obvious, the detection light will not be significantly refracted through the center of the quantitative glass tube section into the uniform air or the sample medium to be sampled, resulting in the The intensity of the outgoing detection light will not go through a process of weakening first and then becom...
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Abstract
The invention discloses a quantitative sampling device which comprises a sample storage device for storing a sample to be sampled, a sample extraction device for extracting the sample into the sample storage device, a light ray collimation device, a light ray emission device and a light ray detection device, wherein the light ray collimation device comprises a first collimation panel and a second collimation panel which are oppositely arranged on the two sides of the sample storage device; a first duct is formed in the first collimation panel, and a second duct is formed in the second collimation panel; a connecting line of the first duct and the second duct passes through a preset chord of the sample storage device; the light ray emission device is used for emitting detection light rays to the first duct; the light ray detection device is used for detecting the detection light rays from the second duct, and the sample extraction device is controlled to stop sampling when the intensity of the emergent detection light rays is lower than a preset value, so that the problem that an optical quantifying system is inaccurate in sampling amount in the prior art is solved, and the phenomenon that the extracted sample overflows the sample storage device is avoided.
Description
technical field [0001] The invention relates to the field of photoelectric detection, and specifically designs a quantitative sampling device. Background technique [0002] The currently used optical quantitative system mainly includes: sampling device, quantitative glass tube, detection light emitter, detection light detector, and relay. The detection light emitted by the detection light emitter passes through the diameter of the quantitative glass tube, and the detection light detector is located on the other side of the quantitative glass tube opposite to the detection light emitter, and is connected to the relay, and the relay Connect to the sampling device. When the quantitative system is working, first determine the sampling end point on the quantitative glass tube according to the required sampling amount, and set the detection light emitter and the detection light detector to ensure that the detection light emitted by the detection light emitter passes through the s...
Claims
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IPC IPC(8): G01N1/14
Inventor 敖小强胡丹
Owner BEIJING SDL TECH