A device for detecting foreign substances comprising: a lighting unit for irradiating light toward an object that is brighter in one direction than other directions or uniformly irradiating light toward the object; a photographing unit spaced from the lighting unit and capable of photographing the object; a controller capable of: allowing the photographing unit to the photograph the object each time the lighting unit irradiates light toward the object that is brighter in one direction than other directions, and controlling the lighting unit and the photographing unit to allow the photographing unit to photograph the object if the lighting unit uniformly irradiates light toward the object; and a processor capable of synthesizing images photographed by the photographing unit and determining whether the object has foreign substances from the synthesized image.

An optical analysis system and an optical analyzer thereof. The optical analyzer comprises a solid state light source emitter, a uniform mixing or light splitting assembly, a first optical receiver, and a second optical receiver. The solid state light source emitter comprises a light source comprising multiple light-emitting assemblies respectively radiating light having at least one light-emitting peak wavelength and at least one wavelength range; the light emitted by the multiple light-emitting assemblies passes through the uniformly mixing or light splitting assembly to form first light and second light which passes through a fluidic object to be detected to form detection light (i.e., after the second light passes through the fluidic object to be detected, the part of the second light not absorbed by the fluidic object to be detected forms detection light. The first optical receiver receives the first light. The second optical receiver receives the detection light.

This application provides an apparatus and a method for measuring chlorine ions in concrete, and relates to the technical field of chlorine ion measurement. The apparatus includes a first optical path system, a second optical path system, a spectrometer, and a central control unit, where the first optical path system includes a femtosecond laser device, an ablative focusing lens group, and a sample; and the second optical path system includes a heating light source, a dichroic mirror, a reflecting mirror, and a heating laser focusing lens group. According to this application, the femtosecond laser device is used as an ablative light source, improving sample ablation efficiency and resolving a problem that a chlorine ion spectral line is weak. In addition, a clustering algorithm is adopted in a sampling process in this application, resolving problems such as a large quantitative error and poor repeatability caused by non-heterogeneity of the concrete.

In an example embodiment, an improved lighting controller designed to reduce the effects of electromagnetic interference is introduced. The improved lighting controller contains software that acts to filter input lines so that noise is ignored while legitimate pulses coming from sensors are handled. The software filter works by comparing pulse widths of pulses on input lines to an expected pulse width.