公开(公告)号：US5489780A

公开(公告)日：1996-02-06

申请号：US333529

申请日：1994-11-02

Applicant: Peter J. Diamondis

Inventor： Peter J. Diamondis

IPC: G01N23/00 ,  G01T1/178 ,  G01J5/10 ,  G01N23/10 ,  G01V5/00 ,  H01J47/18

CPC classification number: G01T1/178 ,  G01N23/00 ,  Y10S250/02

Abstract: A radon detector employs an electrically charged pressed, porous metal filter that allows radon gas diffusion, while blocking ambient light, so that it readily traps both attached and unattached Po-214 and Po-218 ions, that may be present in gas passing through the filter, the filter being charged positively relative to an unbiased PN junction of a photodiode detector within a detection chamber. As a consequence, radon daughter products are prevented from corrupting the radon measurement. Since no voltage differential is applied across its PN junction, the photodiode detector operates in a photovoltaic mode, which avoids the problem of Schottky noise, producing low amplitude current pulses, which are amplified, passband filtered, and thresholded to provide well-defined pulses that are counted over a given measurement interval and converted to radon concentration in terms of picocuries per liter.

Abstract translation: 氡探测器采用带电荷的多孔金属过滤器，其能够阻挡环境光，同时阻挡环境光的氡气扩散，从而易于捕获附着和未附着的Po-214和Po-218离子，这些离子可能存在于通过 过滤器相对于检测室内的光电二极管检测器的无偏压PN结正向地充电。 因此，防止氡子产物腐蚀氡气测量。 由于在其PN结上没有施加电压差，所以光电二极管检测器工作在光伏模式，这避免了肖​​特基噪声的问题，产生了低振幅电流脉冲，其被放大，通带滤波和阈值以提供明确定义的脉冲， 在给定的测量间隔内进行计数，并以每公升皮克换算为氡浓度。

公开(公告)号：US4322607A

公开(公告)日：1982-03-30

申请号：US45221

申请日：1979-06-04

Applicant: Peter J. Diamondis

Inventor： Peter J. Diamondis

IPC: G03B15/03 ,  G06C3/00

CPC classification number: G06C3/00 ,  G03B15/03

Abstract: The Camera Setting Calculator for Underwater Color Photography is a manual, mechanical calculator to be used in determining the aperture setting (f-number) of a camera and consisting of two circular sheets of data pivoted to rotate over each other. Rotation of the top piece inputs the given data and displays the appropriate f-number.

Abstract translation: 水下彩色摄影的相机设置计算器是一种手动的机械计算器，用于确定相机的光圈设置（f数），并由两个圆形数据片组成，以便相互旋转。 顶部的旋转输入给定的数据并显示适当的f数。

公开(公告)号：US5319208A

公开(公告)日：1994-06-07

申请号：US679911

申请日：1991-04-03

Applicant: Peter J. Diamondis

Inventor： Peter J. Diamondis

IPC: G01T1/178 ,  G01T7/04

CPC classification number: G01T7/04 ,  G01T1/178 ,  Y10S250/02

Abstract: A radon gas detector comprises a housing having an air inlet port leading to an interior, a radiation detection (e.g. alpha particle measurement) chamber and an air exhaust port leading from the interior chamber to the exterior of the housing. The chamber is closed to the entry of ambient light by a pair of light-obstructing baffles that respectively couple the air inlet and air exhaust ports to the interior chamber. Coupled with the air inlet port is a first removable, electrically conductive mesh filter. Coupled with the air exhaust port is a second, fixed electrically conductive mesh filter. Since each mesh filter is electrically conductive, it readily traps radon daughter products before they can enter into the interior chamber. Also, because of its mesh configuration, each filter readily permits substantial air flow. To measure radon concentration in the air being circulated through detector, a radiation (e.g. alpha particle responsive) detector in the form of an open photodiode array is disposed within the interior chamber, so as to be exposed to incident alpha particle emissions from the radon gas as it is drawn through the chamber by the operation of the exhaust fan. Daughter product concentration can be derived by a first measurement with the intake filter in place and then a second measurement with the intake filter removed. The difference between the two measurements yields daughter product concentration in working level units.

Abstract translation: 氡气检测器包括具有通向内部的空气入口端口的外壳，辐射检测（例如α粒子测量）腔室和从内部腔室引导到壳体外部的排气口。 通过将空气入口和排气口分别连接到内部室的一对遮光挡板，室对环境光的入射是封闭的。 与进气口相连的是第一个可拆卸，导电的网状过滤器。 与排气口相连的是第二个固定的导电网状过滤器。 由于每个网状过滤器是导电的，所以它们可以在它们可以进入内部室之前容易地捕获氡子体产物。 此外，由于其网状结构，每个过滤器容易地允许大量空气流动。 为了测量通过检测器循环的空气中的氡浓度，开放式光电二极管阵列形式的辐射（例如α粒子响应）检测器设置在内室内，以便暴露于来自氡气的入射α粒子的排放 因为它通过排气扇的操作被吸入室内。 女儿产品浓度可以通过使用进气过滤器就位的第一次测量得到，然后在进气过滤器被去除的情况下进行第二次测量。 两个测量值之间的差异产生了工作级别单位的女儿产品浓度。