公开(公告)号：WO1991008459A1

公开(公告)日：1991-06-13

申请号：PCT/US1990006838

申请日：1990-11-21

Applicant: TSI INCORPORATED

Inventor： TSI INCORPORATED ,  BLESENER, James, L.

IPC: G01N15/14

CPC classification number: G01N21/53 ,  G01N15/14 ,  G01N2015/0238

Abstract: A non-imaging particle counter (10) utilizing one or more detectors (25) which directly collect light scattered by particles in a fluid traversing a sensing volume (63). The detectors (25) are non-imaging, non-focusing, optic-less light collection devices, such as large area photodiodes. The detectors (25) are arranged and configured proximate the sensing volume (63), but such that the beam of light (60) is not operatively incident thereon. The beam of light (60) is provided by a laser (50) and is shaped by a focusing/collimating lens (54). The beam of light (60) passes through several apertures (51-53) to reduce stray/background light in the system. The detectors (25) are oriented at an angle with respect to the plane formed by the longitudinal axis of the beam and the flow of fluid, wherein stray light (61) strikes the detectors (25) at an angle greater than the acceptance angle of the detectors (25), while scattered light strikes the detectors (25) at an angle less than the detectors' (25) acceptance angle. A light stop (31) having a Brewster angle for the wavelength of the beam of light (60) is utilized as a beam stop. Further, a coincidence detection circuit (100) provides for reducing spurious counts caused by ionizing emissions and/or other noise.

公开(公告)号：WO1997006525A1

公开(公告)日：1997-02-20

申请号：PCT/US1995009810

申请日：1995-08-03

Applicant: TSI INCORPORATED

Inventor： TSI INCORPORATED ,  EVENSTAD, James, O.

IPC: G10B09/02

CPC classification number: G01F1/661 ,  G01P5/26 ,  G01S7/4912 ,  G01S17/58

Abstract: A device for detecting and measuring analog coherent frequency bursts (24) includes circuitry for digitally (82) translating the bursts upon their detection. Based on a frequency range estimate, a sampling frequency is selected to govern conversion of the analog burst to a sequence of digital values, which are stored to a sequential memory (84). The digital values later are read out of the memory (84) to a digital-to-analog converter (86) at a predetermined read frequency. The D/A converter (86) output is low-pass filtered (88) to provide a reconstructed analog burst. Sampling rates are selected to limit the frequency range of reconstructed bursts to a single octave, which enables subsequent signal processing with simpler circuitry, for reduced cost and improved accuracy and reliability of measurements obtained.

Abstract translation: 用于检测和测量模拟相干频率脉冲串（24）的装置包括用于在其检测时数字（82）翻译脉冲串的电路。 基于频率范围估计，选择采样频率以管理模拟脉冲串到存储到顺序存储器（84）的数字值序列的转换。 数字值随后将以预定的读取频率从存储器（84）读出到数模转换器（86）。 D / A转换器（86）输出被低通滤波（88）以提供重建的模拟脉冲串。 选择采样率以将重建突发的频率范围限制为单个八度，这使得能够以更简单的电路进行后续的信号处理，以降低成本并提高获得的测量的精度和可靠性。

公开(公告)号：WO1993007465A1

公开(公告)日：1993-04-15

申请号：PCT/US1992008321

申请日：1992-09-30

Applicant: TSI INCORPORATED

Inventor： TSI INCORPORATED ,  KAUFMAN, Stanley, L. ,  ZARRIN, Fahimeh ,  DORMAN, Frank

IPC: G01N15/00

CPC classification number: B05B5/002 ,  B05B5/025 ,  G01N15/065 ,  G01N15/1031 ,  H01J49/165

Abstract: An electrospray nebulizer (20) generates an aerosol comprised of submicrometer droplets substantially uniform in size. A liquid sample is supplied at a controlled rate to a capillary needle (46) of the nebulizer (20), and droplets are formed due to an electrical field in the region about the needle discharge. The tendency of the droplets to disintegrate due to Coulomb forces is conteracted by sources of ionizing radiation within the nebulizer. The ions reduce the charge in each droplet while solvent evaporation reduces the diameter of the droplet. To further ensure against Coulomb disintegration, a controlled air sheath is introduced to the nebulizer for transporting droplets more rapidly downstream. Optionally, solvent vapor can be introduced into the air flow to reduce the rate of solvent evaporation within the nebulizer, and ions can be added to the air flow upstream of the needle discharge.

公开(公告)号：WO1991010913A1

公开(公告)日：1991-07-25

申请号：PCT/US1990005912

申请日：1990-10-12

Applicant: TSI INCORPORATED

Inventor： TSI INCORPORATED ,  JENSON, Leslie, M.

IPC: G01R23/175

CPC classification number: G01S7/021

Abstract: A method and apparatus for automatically detecting a coherent frequency burst is disclosed. The apparatus (10) determines the approximate frequency and duration of the burst. The apparatus (10) operates utilizing principles of autocorrelation to reject random noise and maximize the efficiency of a down stream data signal processor. The apparatus (10) includes delay means (30) which accepts a digitized signal from a device, such as a photodetector in an LDV, and generates a plurality of delayed signals. The delayed signals are then multiplied by the original signals by multiplier means (40). The multiplied signals are provided to averaging circuits (50). The averaged signals are then compared to a reference level by comparators (60), the output of which is provided to priority encoder (70). Priority encoder (70) prioritizes the signals received from comparators (60) and determines the length of the burst.

公开(公告)号：WO1990010858A1

公开(公告)日：1990-09-20

申请号：PCT/US1990001119

申请日：1990-03-02

Applicant: TSI INCORPORATED

Inventor： TSI INCORPORATED ,  BLESENER, James, L. ,  KAUFMAN, Stanley, L. ,  HAIRSTON, Peter, P. ,  DORMAN, Frank, D.

IPC: G01N15/14

CPC classification number: G01N15/1427 ,  G01N15/1404 ,  G01N21/53 ,  G01N2015/0261 ,  G01N2015/1486 ,  G01N2021/4711

Abstract: The device (10) utilizes an impactor (17a) to set an upper limit on particle size. Sample fluid is passed through a high density light, with the intersection of the fluid and high density light forming a sensing volume. Particles in the fluid scatter light which is collected and focused by spherical mirrors (41, 42) onto detectors (34, 35). The scattered light causes a signal to be generated which is then compared by coincidence detecting circuitry in order to qualify whether a particle scattered the light.

Abstract translation: 设备（10）利用冲击器（17a）来设定粒度的上限。 样品流体通过高密度光，流体和高密度光的交点形成感测体积。 流体中的颗粒散射光，其被球面镜（41,42）收集并聚焦到检测器（34,35）上。 散射光产生信号，然后通过重合检测电路将其进行比较，以确定粒子是否散射光。

公开(公告)号：WO1995003524A1

公开(公告)日：1995-02-02

申请号：PCT/US1994008099

申请日：1994-07-19

Applicant: TSI INCORPORATED

Inventor： TSI INCORPORATED ,  NAQWI, Amir, A. ,  JENSON, Leslie, M.

IPC: G01B09/02

CPC classification number: G01P3/366 ,  G01B11/105

Abstract: A system for measuring cross-sectional diameters of optical fibers (16) and other elongate cylindrical objects includes a transmitting optic module (30) for generating two collimated laser beams (22, 24), and causing the beams to intersect and interfere with one another over a measurement region. The optical fiber (16) under inspection is caused to intersect the measurement region with its longitudinal axis perpendicular to a plane defined by the laser beams. Several photodetectors (32, 34) collect light scattered by the optical fiber (16), and generate signals (36, 38) indicating fiber diameter based on phase differences in the scattered light received by the detectors. Differences in Doppler frequencies also are sensed by the detectors, for determining transverse velocity components.

Abstract translation: 用于测量光纤（16）和其它细长圆柱形物体的横截面直径的系统包括用于产生两个准直激光束（22,24）的发射光学模块（30），并且使光束相互交叉并相互干扰 超过测量区域。 使检查中的光纤（16）与测量区域相交，其纵轴垂直于由激光束限定的平面。 几个光电检测器（32,34）收集由光纤（16）散射的光，并且基于由检测器接收的散射光中的相位差产生指示光纤直径的信号（36,38）。 多普勒频率的差异也由检测器感测，用于确定横向速度分量。

公开(公告)号：WO1992005572A1

公开(公告)日：1992-04-02

申请号：PCT/US1991006511

申请日：1991-09-06

Applicant: TSI INCORPORATED

Inventor： TSI INCORPORATED ,  BERKNER, Lawrence, S.

IPC: H01J05/16

CPC classification number: G01N15/1456 ,  G01N15/1436 ,  G01N21/8507 ,  G01N2015/0046 ,  G01N2015/0238 ,  G01N2201/084

Abstract: Instrument (16) for detecting single airborne particles, measuring their concentration, includes transmitting optical fiber (28) optically connected to light source (80) at one end, and collecting optical fiber (30) connected to photodiode (84) at one of its ends. Respective opposite ends of the optical fibers are polished smooth and flat potted into a rigid probe head (46), facing each other and separated by air gap (74). Some of the light crosses gap (74) between optical fibers (28, 30) and reaches detector (84), defining a particle sensing volume (76). Particles passing through this volume are optically detected. The device has simple optics, requiring no lenses or mirrors. The transmitting and collecting fibers, and the air gap, form a well defined and repeatable sensing volume (76). The particle size threshold in the electronics is a percentage of the light to the detector which allows it to remain in calibration when the amount of light through the probe changes.

公开(公告)号：WO1991005237A2

公开(公告)日：1991-04-18

申请号：PCT/US1990005607

申请日：1990-10-01

Applicant: TSI INCORPORATED

Inventor： TSI INCORPORATED ,  BLESENER, James, L. ,  KAUFMAN, Stanley, L. ,  BLACKFORD, David, B. ,  DORMAN, Frank, D. ,  HAIRSTON, Peter, P.

IPC: G01N15/14

CPC classification number: G01N15/1434 ,  G01N21/031 ,  G01N21/59 ,  G01N2015/0046 ,  G01N2015/0238 ,  G01N2201/0612

Abstract: A particle flux counter apparatus utilizing light extinction. The apparatus utilizes two oppositely disposed cylindrical mirrors (21a, 21b) to bounce a beam back and forth between them, the beam traversing the length of the cylindrical mirrors (21a, 21b) in incremental steps. A plane mirror (22) is cooperatively located to reflect the beam back between the system to traverse the length of the cylindrical mirrors (21a, 21b) a second time in incremented steps. The two sets of steps interleaving such that the beam forms a sheet of light. A detector (60) monitors the intensity of the beam. As particles in a sample aerosol intersect the beam, the light is extinguished and the beam intensity changes. The detector (60) transmits a signal to a microprocessor (108) analyzation. The apparatus also utilizes a feedback circuit (300) to regulate the beam intensity and alternatively provides for modulating the beam to provide for higher peak power into the detector (60) and elimination of common mode noise.