A handheld food safety detection device and method

Abstract

The invention discloses a handheld food safety detection device. The device comprises four parts, namely an stimulation-detection integrated probe, a signal processing unit, a control unit and a display unit, wherein the stimulation-detection integrated probe sequentially consists of a laser diode, a collimating lens, a focusing lens and a multi-ring ultrasonic detector from top to bottom; the signal processing unit is formed by sequentially electrically connecting a signal amplifying circuit, an electronic switch, a phase adjusting circuit and an A / D (Analog to Digital) converting circuit; the control unit consists of an embedded system, a laser diode driving circuit and a synchronous trigger circuit; the display circuit consists of an LCD display screen with a touch screen function. Compared with other techniques and devices, the handheld food safety detection device has the advantages that by utilizing a photo-acoustic technique, an embedded control design as well as an ultrasound detection integrated probe stimulated by virtue of the laser diode, the detection device is high in detection accuracy and strong in applicability and is convenient to use.

Description

technical field [0001] The invention relates to a detection device and method, in particular to a hand-held food safety detection device and method, belonging to the field of food inspection and quarantine applications. Background technique [0002] People's daily life is inseparable from various foods, whose quality and safety directly affect people's health, and at the same time play an important role in social stability and sustainable economic development; however, in the real society Among them, there are often some unscrupulous traders and "black-hearted" operators who shoddy or even illegally add various harmful substances to some food, so as to beautify the appearance and taste of food and make huge profits; although the government and inspection and quarantine departments at all Quality and safety are attached great importance and efforts have been intensified. However, due to the huge market, numerous sales outlets, limited inspection personnel, and the limited num...

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Problems solved by technology

[0002] People's daily life is inseparable from various foods, whose quality and safety directly affect people's health, and at the same time play an important role in social stability and sustainable economic development; however, in the real society Among them, there are often some unscrupulous traders and "black-hearted" operators who shoddy or even illegally added various harmful substances to some foods, so as to beautify the appearance and taste of the food and seek huge profits; although the government and inspection and quarantine departments at all levels Quality and safety are attached great importance and efforts have been intensified. However, due to the huge market, numerous sales outlets, limited inspection personnel, and limited number and performance of inspection equipment, it is very difficult to conduct a comprehensive inspection of the quality of various foods on the market; currently The main techniques for testing food quality include spectrophotometry, atomic fluorescence spectrometry, electrochemical method, atomic absorption spectrometry, liquid-phase gas chromatography, etc.; The interference of scattered light from the internal components of the item makes the detection accuracy of this technology relatively low; for atomic fluorescence spectroscopy, although it has the advantages of high sensitivity and wide linear range, there are still problems such as fluorescence quenching effect and scattered light interference. , it is difficult for this method to be used in the determination of complex matrix samples; for electrochemical methods, the selectivity of the electrode is not high, and side reactions are prone to occur, thereby reducing the current efficiency. At the same time, the electrode is easy to form an adsorption layer and an oxide film. For atomic absorption spectrometry, multiple elements cannot be analyzed at the same time. For the determination of refractory elements, the sensitivity is not high. For some elements whose resonance lines are in the vacuum ultraviolet region, such as phosphorus and sulfur, it cannot be determined; for liquid phase gas phase Chromatography and sample pretreatment operations are complicated, and it usually takes one day or even several days for a test from sample extraction to data issuance, and the test cost is also very expensive; in addition, the above-mentioned testing equipment is usually very large in size, and it is generally difficult to do so Online and on-site real-time detection

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