鲁米诺-铁氰化钾化学发光体系测定盐酸异丙肾上腺素

在碱性条件下，铁氰化钾氧化鲁米诺产生发光，盐酸异丙肾上腺素对该体系有显著的增强作用。基于此并结合流动注射技术建立了测定盐酸异丙肾上腺素的新方法。该方法具有很高的灵敏度，检出限为8．6ng／L(IUPAC)；线性范围为0．05～10μg/L。对1．0μg/L盐酸异丙肾上腺素平行测定11次，其相对标准偏差为3．6％。     

Optimized design of laser range finding system using the self-mixing effect in a single-mode VCSEL

An optimized design of laser range finding system using the self-mixing effect in a single-mode vertical-cavity surface-emitting laser (VCSEL) is proposed. In order to improve the ranging accuracy and expand dynamic measurement range, we apply difference frequency analog phase-locked loop (PLL) instead of fast Fourier transform (FFT) to process signal, and choose the optimum triangular wave frequency fm = 500 Hz and small modulation current △Ip-p = 0.28 mA to modulate single-mode VCSEL. The experiment results show that, without controlling the laser's temperature, the ranging accuracy is better than 2 mm and the measurement dynamic range is as large as 50-500 mm when the sampling time is 0,1 s and the room temperature is 0-55℃.     

流动注射化学发光法测定抗蚜威

在多聚磷酸钠介质中,抗蚜威能显著增强RhB-Cu2 -H2O2体系的化学发光强度。基于此,结合流动注射技术,建立了测定抗蚜威的流动注射化学发光新方法。该法的检出限为58μg/L(3σ);线性范围为0.1~10 mg/L;对1.0 mg/L的抗蚜威连续平行测定11次,其相对标准偏差(RSD)为2.8%。该方法灵敏、简单、快速。用于农田水、乌江水、长江水以及自来水中抗蚜威含量的测定,回收率为95.5%~100.9%,结果令人满意。     

Effect of speckle pattern on laser Doppler velocimeters

The effect of speckle pattern on laser Doppler velocimeters is studied theoretically and experimentally. We have found that dynamic speckle patterns can cause error in velocity measurement. Increasing sampling time and using proper signal processing circuits can eliminate this bad effect caused by speckle pattern. The accuracy of velocity measurement is better than 2.1% in a wide velocity range (4.66-468.86 mm/s) when speckle effects are taken into account.     

ce(ⅳ)-rhodamine b-噻枯唑体系化学发光法测定噻枯唑

在酸性介质中,Ce(Ⅳ)可以氧化噻枯唑产生较弱的化学发光,罗丹明B可以显著增强此发光,且增加的发光强度与噻枯唑的质量浓度在一定范围内呈良好的线性关系,由此建立了测定噻枯唑的流动注射化学发光新方法。该法的检出限为12μg/L(3σ),线性范围为30～1 000μg/L,对500μg/L的噻枯唑连续平行测定11次,其相对标准偏差(RSD)为2.4%。用于测定环境水样中和大米中噻枯唑含量,回收率为96.4%～104.1%。     

近红外高速皮秒激光器的研制

新兴的量子密码技术对激光器提出了新的要求.为了满足要求,设计了一种高速内调制半导体激光器.利用专门设计的脉冲整形电路,将输入的触发信号经过扇出电路分成两路,分别经过延时电路产生不同的延时,利用逻辑电路将两路信号转换成窄脉冲信号,通过射频放大电路驱动激光器发光,使输出光脉冲频率达到1 GHz,脉冲宽度小于24 ps,时间抖动小于12 ps,-10 dB谱线宽度仅0.7 nm,输出光波长和功率稳定性高.所研制激光器可满足频率达1 GHz的高速量子密钥分配的需求.     

鲁米诺-过硫酸钠化学发光体系测定硝苯地平

过硫酸钠在碱性条件下能氧化鲁米诺产生微弱化学发光,硝苯地平能大大增强此发光。基于此．建立起了一种直接测定硝苯地平的流动注射化学发光方法。该方法线性范围为0．05～5．0mg／L;检出限为0．017mg/L;相对标准偏差为2．8％(硝苯地平0．5mg／L,n=11)。利用该方法测定了硝苯地平片剂含量,结果令人满意。     

单纵模VCSEL自混合多普勒测速传感系统的设计

基于激光自混合原理研制了多普勒测速传感系统,应用单纵模垂直腔面发射激光器(VCSEL),简化了光路设计;应用差频模拟锁相环技术处理微弱自混合多普勒信号,提高了测速精度和动态范围;应用单片机进行数字采样测量多普勒频移和计算物体的运动速度,实现了传感系统的集成化和小型化.实验结果表明,该传感系统在采样时间为0.1S的条件下,测速精度优于1%,测速范围达到30～500 mm/s,具有非接触式测量、测速精度高、动态范围大、结构简单、成本低和易于集成化等优点,在生物工程测量等领域有着广泛的应用前景.

Abstract：

The Doppler velocity sensor system based on laser self-mixing effect applies single-longitudinal-mode vertical-cavity surface-emitted laser (VCSEL),simplifying the optical path.And it uses difference frequency analogy phase locked loop (APLL) to process the self-mixing Doppler signal,so both the velocity measurement accuracy and dynamic range can be improved obviously.And it uses microcontroller unit (MCU) to make digital sampling and measure the Doppler signal frequency to obtain the velocity of the target,realizing the integration and miniaturization of velocity sensor systems.The experimental results show that,with the sampling time of 0.Is,the velocity measurement accuracy is better than 1%,and the dynamic range is from 30mm/s to 500 mm/s.The Doppler velocity sensor system has advantages of non-touch measurement,high accuracy of velocity measurement,wide dynamic range,simple configuration,low cost,and convenience in integration,so it has wide applications in such fields as bioengineering measurement.     

Coarse error analysis and correction of a two-dimensional triangulation range finder

A real-time two-dimensional (2D) triangulation range finder is presented, which is composed of two linear complementary metal oxidation semiconductor (CMOS) chips, two camera lenses, and four light emitting diodes (LEDs). The high order distortion in image aberrations is the main factor responsible for the coarse errors. The theoretical prediction is in good agreement with experiments and the correction equation is used to obtain more reliable results with the unique distortion coefficient in the whole working region.     

Germanium-on-silicon avalanche photodiode for 1550 nm weak light signal detection at room temperature

To optimize the dark current characteristic and detection efficiency of the 1550 nm weak light signal at room temperature,this work proposes a Ge-on-Si avalanche photodiode [APD) in Geiger mode, which could operate at 300 K. This lateral separate absorption charge multiplication APD shows a low breakdown voltage [Vbr) in Geiger mode of-7.42 V and low dark current of 0.096 n A at unity gain voltage [V_Gain=1=-7.03 V). Combined with an RF amplifier module and counter, the detection syste...